/* Support routines for Value Range Propagation (VRP).
- Copyright (C) 2005-2013 Free Software Foundation, Inc.
+ Copyright (C) 2005-2015 Free Software Foundation, Inc.
Contributed by Diego Novillo <dnovillo@redhat.com>.
This file is part of GCC.
#include "coretypes.h"
#include "tm.h"
#include "flags.h"
+#include "alias.h"
+#include "symtab.h"
#include "tree.h"
+#include "fold-const.h"
#include "stor-layout.h"
#include "calls.h"
+#include "predict.h"
+#include "hard-reg-set.h"
+#include "function.h"
+#include "dominance.h"
+#include "cfg.h"
+#include "cfganal.h"
#include "basic-block.h"
#include "tree-ssa-alias.h"
#include "internal-fn.h"
#include "gimple-fold.h"
#include "tree-eh.h"
#include "gimple-expr.h"
-#include "is-a.h"
#include "gimple.h"
#include "gimple-iterator.h"
#include "gimple-walk.h"
#include "tree-ssa-propagate.h"
#include "tree-chrec.h"
#include "tree-ssa-threadupdate.h"
+#include "rtl.h"
+#include "insn-config.h"
+#include "expmed.h"
+#include "dojump.h"
+#include "explow.h"
+#include "emit-rtl.h"
+#include "varasm.h"
+#include "stmt.h"
#include "expr.h"
+#include "insn-codes.h"
#include "optabs.h"
+#include "tree-ssa-scopedtables.h"
#include "tree-ssa-threadedge.h"
static int *vr_phi_edge_counts;
typedef struct {
- gimple stmt;
+ gswitch *stmt;
tree vec;
} switch_update;
static inline bool
is_negative_overflow_infinity (const_tree val)
{
- return (needs_overflow_infinity (TREE_TYPE (val))
- && CONSTANT_CLASS_P (val)
- && TREE_OVERFLOW (val)
+ return (TREE_OVERFLOW_P (val)
+ && needs_overflow_infinity (TREE_TYPE (val))
&& vrp_val_is_min (val));
}
static inline bool
is_positive_overflow_infinity (const_tree val)
{
- return (needs_overflow_infinity (TREE_TYPE (val))
- && CONSTANT_CLASS_P (val)
- && TREE_OVERFLOW (val)
+ return (TREE_OVERFLOW_P (val)
+ && needs_overflow_infinity (TREE_TYPE (val))
&& vrp_val_is_max (val));
}
static inline bool
is_overflow_infinity (const_tree val)
{
- return (needs_overflow_infinity (TREE_TYPE (val))
- && CONSTANT_CLASS_P (val)
- && TREE_OVERFLOW (val)
+ return (TREE_OVERFLOW_P (val)
+ && needs_overflow_infinity (TREE_TYPE (val))
&& (vrp_val_is_min (val) || vrp_val_is_max (val)));
}
if (arg == cfun->static_chain_decl)
return true;
+ /* THIS argument of method is always non-NULL. */
+ if (TREE_CODE (TREE_TYPE (current_function_decl)) == METHOD_TYPE
+ && arg == DECL_ARGUMENTS (current_function_decl)
+ && flag_delete_null_pointer_checks)
+ return true;
+
+ /* Values passed by reference are always non-NULL. */
+ if (TREE_CODE (TREE_TYPE (arg)) == REFERENCE_TYPE
+ && flag_delete_null_pointer_checks)
+ return true;
+
fntype = TREE_TYPE (current_function_decl);
for (attrs = TYPE_ATTRIBUTES (fntype); attrs; attrs = TREE_CHAIN (attrs))
{
return true;
if (!val1 || !val2 || !operand_equal_p (val1, val2, 0))
return false;
- if (is_overflow_infinity (val1))
- return is_overflow_infinity (val2);
- return true;
+ return is_overflow_infinity (val1) == is_overflow_infinity (val2);
}
/* Return true, if the bitmaps B1 and B2 are equal. */
value_range_t *old_vr;
bool is_new;
+ /* If there is a value-range on the SSA name from earlier analysis
+ factor that in. */
+ if (INTEGRAL_TYPE_P (TREE_TYPE (var)))
+ {
+ wide_int min, max;
+ value_range_type rtype = get_range_info (var, &min, &max);
+ if (rtype == VR_RANGE || rtype == VR_ANTI_RANGE)
+ {
+ value_range_d nr;
+ nr.type = rtype;
+ nr.min = wide_int_to_tree (TREE_TYPE (var), min);
+ nr.max = wide_int_to_tree (TREE_TYPE (var), max);
+ nr.equiv = NULL;
+ vrp_intersect_ranges (new_vr, &nr);
+ }
+ }
+
/* Update the value range, if necessary. */
old_vr = get_value_range (var);
is_new = old_vr->type != new_vr->type
if (is_new)
{
/* Do not allow transitions up the lattice. The following
- is slightly more awkward than just new_vr->type < old_vr->type
+ is slightly more awkward than just new_vr->type < old_vr->type
because VR_RANGE and VR_ANTI_RANGE need to be considered
the same. We may not have is_new when transitioning to
- UNDEFINED or from VARYING. */
- if (new_vr->type == VR_UNDEFINED
- || old_vr->type == VR_VARYING)
- set_value_range_to_varying (old_vr);
+ UNDEFINED. If old_vr->type is VARYING, we shouldn't be
+ called. */
+ if (new_vr->type == VR_UNDEFINED)
+ {
+ BITMAP_FREE (new_vr->equiv);
+ set_value_range_to_varying (old_vr);
+ set_value_range_to_varying (new_vr);
+ return true;
+ }
else
set_value_range (old_vr, new_vr->type, new_vr->min, new_vr->max,
new_vr->equiv);
|| !is_gimple_min_invariant (vr->max));
}
+/* Return the single symbol (an SSA_NAME) contained in T if any, or NULL_TREE
+ otherwise. We only handle additive operations and set NEG to true if the
+ symbol is negated and INV to the invariant part, if any. */
+
+static tree
+get_single_symbol (tree t, bool *neg, tree *inv)
+{
+ bool neg_;
+ tree inv_;
+
+ if (TREE_CODE (t) == PLUS_EXPR
+ || TREE_CODE (t) == POINTER_PLUS_EXPR
+ || TREE_CODE (t) == MINUS_EXPR)
+ {
+ if (is_gimple_min_invariant (TREE_OPERAND (t, 0)))
+ {
+ neg_ = (TREE_CODE (t) == MINUS_EXPR);
+ inv_ = TREE_OPERAND (t, 0);
+ t = TREE_OPERAND (t, 1);
+ }
+ else if (is_gimple_min_invariant (TREE_OPERAND (t, 1)))
+ {
+ neg_ = false;
+ inv_ = TREE_OPERAND (t, 1);
+ t = TREE_OPERAND (t, 0);
+ }
+ else
+ return NULL_TREE;
+ }
+ else
+ {
+ neg_ = false;
+ inv_ = NULL_TREE;
+ }
+
+ if (TREE_CODE (t) == NEGATE_EXPR)
+ {
+ t = TREE_OPERAND (t, 0);
+ neg_ = !neg_;
+ }
+
+ if (TREE_CODE (t) != SSA_NAME)
+ return NULL_TREE;
+
+ *neg = neg_;
+ *inv = inv_;
+ return t;
+}
+
+/* The reverse operation: build a symbolic expression with TYPE
+ from symbol SYM, negated according to NEG, and invariant INV. */
+
+static tree
+build_symbolic_expr (tree type, tree sym, bool neg, tree inv)
+{
+ const bool pointer_p = POINTER_TYPE_P (type);
+ tree t = sym;
+
+ if (neg)
+ t = build1 (NEGATE_EXPR, type, t);
+
+ if (integer_zerop (inv))
+ return t;
+
+ return build2 (pointer_p ? POINTER_PLUS_EXPR : PLUS_EXPR, type, t, inv);
+}
+
+/* Return true if value range VR involves exactly one symbol SYM. */
+
+static bool
+symbolic_range_based_on_p (value_range_t *vr, const_tree sym)
+{
+ bool neg, min_has_symbol, max_has_symbol;
+ tree inv;
+
+ if (is_gimple_min_invariant (vr->min))
+ min_has_symbol = false;
+ else if (get_single_symbol (vr->min, &neg, &inv) == sym)
+ min_has_symbol = true;
+ else
+ return false;
+
+ if (is_gimple_min_invariant (vr->max))
+ max_has_symbol = false;
+ else if (get_single_symbol (vr->max, &neg, &inv) == sym)
+ max_has_symbol = true;
+ else
+ return false;
+
+ return (min_has_symbol || max_has_symbol);
+}
+
/* Return true if value range VR uses an overflow infinity. */
static inline bool
&& DECL_IS_OPERATOR_NEW (fndecl)
&& !TREE_NOTHROW (fndecl))
return true;
+ /* References are always non-NULL. */
+ if (flag_delete_null_pointer_checks
+ && TREE_CODE (TREE_TYPE (fndecl)) == REFERENCE_TYPE)
+ return true;
if (flag_delete_null_pointer_checks &&
lookup_attribute ("returns_nonnull",
TYPE_ATTRIBUTES (gimple_call_fntype (stmt))))
{
/* LT is folded faster than GE and others. Inline the common case. */
if (TREE_CODE (val) == INTEGER_CST && TREE_CODE (val2) == INTEGER_CST)
- {
- if (TYPE_UNSIGNED (TREE_TYPE (val)))
- return INT_CST_LT_UNSIGNED (val, val2);
- else
- {
- if (INT_CST_LT (val, val2))
- return 1;
- }
- }
+ return tree_int_cst_lt (val, val2);
else
{
tree tcmp;
both integers. */
gcc_assert (POINTER_TYPE_P (TREE_TYPE (val1))
== POINTER_TYPE_P (TREE_TYPE (val2)));
+
/* Convert the two values into the same type. This is needed because
sizetype causes sign extension even for unsigned types. */
val2 = fold_convert (TREE_TYPE (val1), val2);
STRIP_USELESS_TYPE_CONVERSION (val2);
if ((TREE_CODE (val1) == SSA_NAME
+ || (TREE_CODE (val1) == NEGATE_EXPR
+ && TREE_CODE (TREE_OPERAND (val1, 0)) == SSA_NAME)
|| TREE_CODE (val1) == PLUS_EXPR
|| TREE_CODE (val1) == MINUS_EXPR)
&& (TREE_CODE (val2) == SSA_NAME
+ || (TREE_CODE (val2) == NEGATE_EXPR
+ && TREE_CODE (TREE_OPERAND (val2, 0)) == SSA_NAME)
|| TREE_CODE (val2) == PLUS_EXPR
|| TREE_CODE (val2) == MINUS_EXPR))
{
tree n1, c1, n2, c2;
enum tree_code code1, code2;
- /* If VAL1 and VAL2 are of the form 'NAME [+-] CST' or 'NAME',
+ /* If VAL1 and VAL2 are of the form '[-]NAME [+-] CST' or 'NAME',
return -1 or +1 accordingly. If VAL1 and VAL2 don't use the
same name, return -2. */
- if (TREE_CODE (val1) == SSA_NAME)
+ if (TREE_CODE (val1) == SSA_NAME || TREE_CODE (val1) == NEGATE_EXPR)
{
code1 = SSA_NAME;
n1 = val1;
}
}
- if (TREE_CODE (val2) == SSA_NAME)
+ if (TREE_CODE (val2) == SSA_NAME || TREE_CODE (val2) == NEGATE_EXPR)
{
code2 = SSA_NAME;
n2 = val2;
}
/* Both values must use the same name. */
+ if (TREE_CODE (n1) == NEGATE_EXPR && TREE_CODE (n2) == NEGATE_EXPR)
+ {
+ n1 = TREE_OPERAND (n1, 0);
+ n2 = TREE_OPERAND (n2, 0);
+ }
if (n1 != n2)
return -2;
- if (code1 == SSA_NAME
- && code2 == SSA_NAME)
+ if (code1 == SSA_NAME && code2 == SSA_NAME)
/* NAME == NAME */
return 0;
/* Make sure to not set TREE_OVERFLOW on the final type
conversion. We are willingly interpreting large positive
- unsigned values as negative singed values here. */
- min = force_fit_type_double (TREE_TYPE (var), tree_to_double_int (min),
- 0, false);
- max = force_fit_type_double (TREE_TYPE (var), tree_to_double_int (max),
- 0, false);
+ unsigned values as negative signed values here. */
+ min = force_fit_type (TREE_TYPE (var), wi::to_widest (min), 0, false);
+ max = force_fit_type (TREE_TYPE (var), wi::to_widest (max), 0, false);
/* We can transform a max, min range to an anti-range or
vice-versa. Use set_and_canonicalize_value_range which does
{
value_range_t *var_vr = get_value_range (var);
- if (var_vr->type != VR_UNDEFINED && var_vr->type != VR_VARYING)
+ if (var_vr->type != VR_VARYING)
copy_value_range (vr, var_vr);
else
set_value_range (vr, VR_RANGE, var, var, NULL);
/* If the singed operation wraps then int_const_binop has done
everything we want. */
;
+ /* Signed division of -1/0 overflows and by the time it gets here
+ returns NULL_TREE. */
+ else if (!res)
+ return NULL_TREE;
else if ((TREE_OVERFLOW (res)
&& !TREE_OVERFLOW (val1)
&& !TREE_OVERFLOW (val2))
}
-/* For range VR compute two double_int bitmasks. In *MAY_BE_NONZERO
+/* For range VR compute two wide_int bitmasks. In *MAY_BE_NONZERO
bitmask if some bit is unset, it means for all numbers in the range
the bit is 0, otherwise it might be 0 or 1. In *MUST_BE_NONZERO
bitmask if some bit is set, it means for all numbers in the range
the bit is 1, otherwise it might be 0 or 1. */
static bool
-zero_nonzero_bits_from_vr (value_range_t *vr,
- double_int *may_be_nonzero,
- double_int *must_be_nonzero)
+zero_nonzero_bits_from_vr (const tree expr_type,
+ value_range_t *vr,
+ wide_int *may_be_nonzero,
+ wide_int *must_be_nonzero)
{
- *may_be_nonzero = double_int_minus_one;
- *must_be_nonzero = double_int_zero;
+ *may_be_nonzero = wi::minus_one (TYPE_PRECISION (expr_type));
+ *must_be_nonzero = wi::zero (TYPE_PRECISION (expr_type));
if (!range_int_cst_p (vr)
|| is_overflow_infinity (vr->min)
|| is_overflow_infinity (vr->max))
if (range_int_cst_singleton_p (vr))
{
- *may_be_nonzero = tree_to_double_int (vr->min);
+ *may_be_nonzero = vr->min;
*must_be_nonzero = *may_be_nonzero;
}
else if (tree_int_cst_sgn (vr->min) >= 0
|| tree_int_cst_sgn (vr->max) < 0)
{
- double_int dmin = tree_to_double_int (vr->min);
- double_int dmax = tree_to_double_int (vr->max);
- double_int xor_mask = dmin ^ dmax;
- *may_be_nonzero = dmin | dmax;
- *must_be_nonzero = dmin & dmax;
- if (xor_mask.high != 0)
- {
- unsigned HOST_WIDE_INT mask
- = ((unsigned HOST_WIDE_INT) 1
- << floor_log2 (xor_mask.high)) - 1;
- may_be_nonzero->low = ALL_ONES;
- may_be_nonzero->high |= mask;
- must_be_nonzero->low = 0;
- must_be_nonzero->high &= ~mask;
- }
- else if (xor_mask.low != 0)
+ wide_int xor_mask = wi::bit_xor (vr->min, vr->max);
+ *may_be_nonzero = wi::bit_or (vr->min, vr->max);
+ *must_be_nonzero = wi::bit_and (vr->min, vr->max);
+ if (xor_mask != 0)
{
- unsigned HOST_WIDE_INT mask
- = ((unsigned HOST_WIDE_INT) 1
- << floor_log2 (xor_mask.low)) - 1;
- may_be_nonzero->low |= mask;
- must_be_nonzero->low &= ~mask;
+ wide_int mask = wi::mask (wi::floor_log2 (xor_mask), false,
+ may_be_nonzero->get_precision ());
+ *may_be_nonzero = *may_be_nonzero | mask;
+ *must_be_nonzero = must_be_nonzero->and_not (mask);
}
}
{
vr0->type = VR_RANGE;
vr0->min = vrp_val_min (type);
- vr0->max
- = double_int_to_tree (type,
- tree_to_double_int (ar->min) - double_int_one);
+ vr0->max = wide_int_to_tree (type, wi::sub (ar->min, 1));
}
if (!vrp_val_is_max (ar->max))
{
vr1->type = VR_RANGE;
- vr1->min
- = double_int_to_tree (type,
- tree_to_double_int (ar->max) + double_int_one);
+ vr1->min = wide_int_to_tree (type, wi::add (ar->max, 1));
vr1->max = vrp_val_max (type);
}
if (vr0->type == VR_UNDEFINED)
set_value_range (vr, type, min, max, NULL);
}
-/* Some quadruple precision helpers. */
-static int
-quad_int_cmp (double_int l0, double_int h0,
- double_int l1, double_int h1, bool uns)
-{
- int c = h0.cmp (h1, uns);
- if (c != 0) return c;
- return l0.ucmp (l1);
-}
-
-static void
-quad_int_pair_sort (double_int *l0, double_int *h0,
- double_int *l1, double_int *h1, bool uns)
-{
- if (quad_int_cmp (*l0, *h0, *l1, *h1, uns) > 0)
- {
- double_int tmp;
- tmp = *l0; *l0 = *l1; *l1 = tmp;
- tmp = *h0; *h0 = *h1; *h1 = tmp;
- }
-}
-
/* Extract range information from a binary operation CODE based on
- the ranges of each of its operands, *VR0 and *VR1 with resulting
+ the ranges of each of its operands *VR0 and *VR1 with resulting
type EXPR_TYPE. The resulting range is stored in *VR. */
static void
type = vr0.type;
/* Refuse to operate on VARYING ranges, ranges of different kinds
- and symbolic ranges. As an exception, we allow BIT_AND_EXPR
+ and symbolic ranges. As an exception, we allow BIT_{AND,IOR}
because we may be able to derive a useful range even if one of
the operands is VR_VARYING or symbolic range. Similarly for
- divisions. TODO, we may be able to derive anti-ranges in
- some cases. */
+ divisions, MIN/MAX and PLUS/MINUS.
+
+ TODO, we may be able to derive anti-ranges in some cases. */
if (code != BIT_AND_EXPR
&& code != BIT_IOR_EXPR
&& code != TRUNC_DIV_EXPR
&& code != TRUNC_MOD_EXPR
&& code != MIN_EXPR
&& code != MAX_EXPR
+ && code != PLUS_EXPR
+ && code != MINUS_EXPR
+ && code != RSHIFT_EXPR
&& (vr0.type == VR_VARYING
|| vr1.type == VR_VARYING
|| vr0.type != vr1.type
range and see what we end up with. */
if (code == PLUS_EXPR || code == MINUS_EXPR)
{
- /* If we have a PLUS_EXPR with two VR_RANGE integer constant
- ranges compute the precise range for such case if possible. */
- if (range_int_cst_p (&vr0)
- && range_int_cst_p (&vr1)
- /* We need as many bits as the possibly unsigned inputs. */
- && TYPE_PRECISION (expr_type) <= HOST_BITS_PER_DOUBLE_INT)
- {
- double_int min0 = tree_to_double_int (vr0.min);
- double_int max0 = tree_to_double_int (vr0.max);
- double_int min1 = tree_to_double_int (vr1.min);
- double_int max1 = tree_to_double_int (vr1.max);
- bool uns = TYPE_UNSIGNED (expr_type);
- double_int type_min
- = double_int::min_value (TYPE_PRECISION (expr_type), uns);
- double_int type_max
- = double_int::max_value (TYPE_PRECISION (expr_type), uns);
- double_int dmin, dmax;
+ const bool minus_p = (code == MINUS_EXPR);
+ tree min_op0 = vr0.min;
+ tree min_op1 = minus_p ? vr1.max : vr1.min;
+ tree max_op0 = vr0.max;
+ tree max_op1 = minus_p ? vr1.min : vr1.max;
+ tree sym_min_op0 = NULL_TREE;
+ tree sym_min_op1 = NULL_TREE;
+ tree sym_max_op0 = NULL_TREE;
+ tree sym_max_op1 = NULL_TREE;
+ bool neg_min_op0, neg_min_op1, neg_max_op0, neg_max_op1;
+
+ /* If we have a PLUS or MINUS with two VR_RANGEs, either constant or
+ single-symbolic ranges, try to compute the precise resulting range,
+ but only if we know that this resulting range will also be constant
+ or single-symbolic. */
+ if (vr0.type == VR_RANGE && vr1.type == VR_RANGE
+ && (TREE_CODE (min_op0) == INTEGER_CST
+ || (sym_min_op0
+ = get_single_symbol (min_op0, &neg_min_op0, &min_op0)))
+ && (TREE_CODE (min_op1) == INTEGER_CST
+ || (sym_min_op1
+ = get_single_symbol (min_op1, &neg_min_op1, &min_op1)))
+ && (!(sym_min_op0 && sym_min_op1)
+ || (sym_min_op0 == sym_min_op1
+ && neg_min_op0 == (minus_p ? neg_min_op1 : !neg_min_op1)))
+ && (TREE_CODE (max_op0) == INTEGER_CST
+ || (sym_max_op0
+ = get_single_symbol (max_op0, &neg_max_op0, &max_op0)))
+ && (TREE_CODE (max_op1) == INTEGER_CST
+ || (sym_max_op1
+ = get_single_symbol (max_op1, &neg_max_op1, &max_op1)))
+ && (!(sym_max_op0 && sym_max_op1)
+ || (sym_max_op0 == sym_max_op1
+ && neg_max_op0 == (minus_p ? neg_max_op1 : !neg_max_op1))))
+ {
+ const signop sgn = TYPE_SIGN (expr_type);
+ const unsigned int prec = TYPE_PRECISION (expr_type);
+ wide_int type_min, type_max, wmin, wmax;
int min_ovf = 0;
int max_ovf = 0;
- if (code == PLUS_EXPR)
+ /* Get the lower and upper bounds of the type. */
+ if (TYPE_OVERFLOW_WRAPS (expr_type))
{
- dmin = min0 + min1;
- dmax = max0 + max1;
-
- /* Check for overflow in double_int. */
- if (min1.cmp (double_int_zero, uns) != dmin.cmp (min0, uns))
- min_ovf = min0.cmp (dmin, uns);
- if (max1.cmp (double_int_zero, uns) != dmax.cmp (max0, uns))
- max_ovf = max0.cmp (dmax, uns);
+ type_min = wi::min_value (prec, sgn);
+ type_max = wi::max_value (prec, sgn);
}
- else /* if (code == MINUS_EXPR) */
+ else
{
- dmin = min0 - max1;
- dmax = max0 - min1;
+ type_min = vrp_val_min (expr_type);
+ type_max = vrp_val_max (expr_type);
+ }
+
+ /* Combine the lower bounds, if any. */
+ if (min_op0 && min_op1)
+ {
+ if (minus_p)
+ {
+ wmin = wi::sub (min_op0, min_op1);
+
+ /* Check for overflow. */
+ if (wi::cmp (0, min_op1, sgn)
+ != wi::cmp (wmin, min_op0, sgn))
+ min_ovf = wi::cmp (min_op0, min_op1, sgn);
+ }
+ else
+ {
+ wmin = wi::add (min_op0, min_op1);
- if (double_int_zero.cmp (max1, uns) != dmin.cmp (min0, uns))
- min_ovf = min0.cmp (max1, uns);
- if (double_int_zero.cmp (min1, uns) != dmax.cmp (max0, uns))
- max_ovf = max0.cmp (min1, uns);
+ /* Check for overflow. */
+ if (wi::cmp (min_op1, 0, sgn)
+ != wi::cmp (wmin, min_op0, sgn))
+ min_ovf = wi::cmp (min_op0, wmin, sgn);
+ }
}
+ else if (min_op0)
+ wmin = min_op0;
+ else if (min_op1)
+ wmin = minus_p ? wi::neg (min_op1) : min_op1;
+ else
+ wmin = wi::shwi (0, prec);
- /* For non-wrapping arithmetic look at possibly smaller
- value-ranges of the type. */
- if (!TYPE_OVERFLOW_WRAPS (expr_type))
+ /* Combine the upper bounds, if any. */
+ if (max_op0 && max_op1)
{
- if (vrp_val_min (expr_type))
- type_min = tree_to_double_int (vrp_val_min (expr_type));
- if (vrp_val_max (expr_type))
- type_max = tree_to_double_int (vrp_val_max (expr_type));
+ if (minus_p)
+ {
+ wmax = wi::sub (max_op0, max_op1);
+
+ /* Check for overflow. */
+ if (wi::cmp (0, max_op1, sgn)
+ != wi::cmp (wmax, max_op0, sgn))
+ max_ovf = wi::cmp (max_op0, max_op1, sgn);
+ }
+ else
+ {
+ wmax = wi::add (max_op0, max_op1);
+
+ if (wi::cmp (max_op1, 0, sgn)
+ != wi::cmp (wmax, max_op0, sgn))
+ max_ovf = wi::cmp (max_op0, wmax, sgn);
+ }
}
+ else if (max_op0)
+ wmax = max_op0;
+ else if (max_op1)
+ wmax = minus_p ? wi::neg (max_op1) : max_op1;
+ else
+ wmax = wi::shwi (0, prec);
/* Check for type overflow. */
if (min_ovf == 0)
{
- if (dmin.cmp (type_min, uns) == -1)
+ if (wi::cmp (wmin, type_min, sgn) == -1)
min_ovf = -1;
- else if (dmin.cmp (type_max, uns) == 1)
+ else if (wi::cmp (wmin, type_max, sgn) == 1)
min_ovf = 1;
}
if (max_ovf == 0)
{
- if (dmax.cmp (type_min, uns) == -1)
+ if (wi::cmp (wmax, type_min, sgn) == -1)
max_ovf = -1;
- else if (dmax.cmp (type_max, uns) == 1)
+ else if (wi::cmp (wmax, type_max, sgn) == 1)
max_ovf = 1;
}
+ /* If we have overflow for the constant part and the resulting
+ range will be symbolic, drop to VR_VARYING. */
+ if ((min_ovf && sym_min_op0 != sym_min_op1)
+ || (max_ovf && sym_max_op0 != sym_max_op1))
+ {
+ set_value_range_to_varying (vr);
+ return;
+ }
+
if (TYPE_OVERFLOW_WRAPS (expr_type))
{
/* If overflow wraps, truncate the values and adjust the
range kind and bounds appropriately. */
- double_int tmin
- = dmin.ext (TYPE_PRECISION (expr_type), uns);
- double_int tmax
- = dmax.ext (TYPE_PRECISION (expr_type), uns);
+ wide_int tmin = wide_int::from (wmin, prec, sgn);
+ wide_int tmax = wide_int::from (wmax, prec, sgn);
if (min_ovf == max_ovf)
{
/* No overflow or both overflow or underflow. The
range kind stays VR_RANGE. */
- min = double_int_to_tree (expr_type, tmin);
- max = double_int_to_tree (expr_type, tmax);
+ min = wide_int_to_tree (expr_type, tmin);
+ max = wide_int_to_tree (expr_type, tmax);
}
- else if (min_ovf == -1
- && max_ovf == 1)
+ else if (min_ovf == -1 && max_ovf == 1)
{
/* Underflow and overflow, drop to VR_VARYING. */
set_value_range_to_varying (vr);
/* Min underflow or max overflow. The range kind
changes to VR_ANTI_RANGE. */
bool covers = false;
- double_int tem = tmin;
+ wide_int tem = tmin;
gcc_assert ((min_ovf == -1 && max_ovf == 0)
|| (max_ovf == 1 && min_ovf == 0));
type = VR_ANTI_RANGE;
- tmin = tmax + double_int_one;
- if (tmin.cmp (tmax, uns) < 0)
+ tmin = tmax + 1;
+ if (wi::cmp (tmin, tmax, sgn) < 0)
covers = true;
- tmax = tem + double_int_minus_one;
- if (tmax.cmp (tem, uns) > 0)
+ tmax = tem - 1;
+ if (wi::cmp (tmax, tem, sgn) > 0)
covers = true;
/* If the anti-range would cover nothing, drop to varying.
Likewise if the anti-range bounds are outside of the
types values. */
- if (covers || tmin.cmp (tmax, uns) > 0)
+ if (covers || wi::cmp (tmin, tmax, sgn) > 0)
{
set_value_range_to_varying (vr);
return;
}
- min = double_int_to_tree (expr_type, tmin);
- max = double_int_to_tree (expr_type, tmax);
+ min = wide_int_to_tree (expr_type, tmin);
+ max = wide_int_to_tree (expr_type, tmax);
}
}
else
&& supports_overflow_infinity (expr_type))
min = negative_overflow_infinity (expr_type);
else
- min = double_int_to_tree (expr_type, type_min);
+ min = wide_int_to_tree (expr_type, type_min);
}
else if (min_ovf == 1)
{
&& supports_overflow_infinity (expr_type))
min = positive_overflow_infinity (expr_type);
else
- min = double_int_to_tree (expr_type, type_max);
+ min = wide_int_to_tree (expr_type, type_max);
}
else
- min = double_int_to_tree (expr_type, dmin);
+ min = wide_int_to_tree (expr_type, wmin);
if (max_ovf == -1)
{
&& supports_overflow_infinity (expr_type))
max = negative_overflow_infinity (expr_type);
else
- max = double_int_to_tree (expr_type, type_min);
+ max = wide_int_to_tree (expr_type, type_min);
}
else if (max_ovf == 1)
{
&& supports_overflow_infinity (expr_type))
max = positive_overflow_infinity (expr_type);
else
- max = double_int_to_tree (expr_type, type_max);
+ max = wide_int_to_tree (expr_type, type_max);
}
else
- max = double_int_to_tree (expr_type, dmax);
+ max = wide_int_to_tree (expr_type, wmax);
}
+
if (needs_overflow_infinity (expr_type)
&& supports_overflow_infinity (expr_type))
{
- if (is_negative_overflow_infinity (vr0.min)
- || (code == PLUS_EXPR
- ? is_negative_overflow_infinity (vr1.min)
- : is_positive_overflow_infinity (vr1.max)))
+ if ((min_op0 && is_negative_overflow_infinity (min_op0))
+ || (min_op1
+ && (minus_p
+ ? is_positive_overflow_infinity (min_op1)
+ : is_negative_overflow_infinity (min_op1))))
min = negative_overflow_infinity (expr_type);
- if (is_positive_overflow_infinity (vr0.max)
- || (code == PLUS_EXPR
- ? is_positive_overflow_infinity (vr1.max)
- : is_negative_overflow_infinity (vr1.min)))
+ if ((max_op0 && is_positive_overflow_infinity (max_op0))
+ || (max_op1
+ && (minus_p
+ ? is_negative_overflow_infinity (max_op1)
+ : is_positive_overflow_infinity (max_op1))))
max = positive_overflow_infinity (expr_type);
}
+
+ /* If the result lower bound is constant, we're done;
+ otherwise, build the symbolic lower bound. */
+ if (sym_min_op0 == sym_min_op1)
+ ;
+ else if (sym_min_op0)
+ min = build_symbolic_expr (expr_type, sym_min_op0,
+ neg_min_op0, min);
+ else if (sym_min_op1)
+ min = build_symbolic_expr (expr_type, sym_min_op1,
+ neg_min_op1 ^ minus_p, min);
+
+ /* Likewise for the upper bound. */
+ if (sym_max_op0 == sym_max_op1)
+ ;
+ else if (sym_max_op0)
+ max = build_symbolic_expr (expr_type, sym_max_op0,
+ neg_max_op0, max);
+ else if (sym_max_op1)
+ max = build_symbolic_expr (expr_type, sym_max_op1,
+ neg_max_op1 ^ minus_p, max);
}
else
{
else if (code == MULT_EXPR)
{
/* Fancy code so that with unsigned, [-3,-1]*[-3,-1] does not
- drop to varying. */
+ drop to varying. This test requires 2*prec bits if both
+ operands are signed and 2*prec + 2 bits if either is not. */
+
+ signop sign = TYPE_SIGN (expr_type);
+ unsigned int prec = TYPE_PRECISION (expr_type);
+
if (range_int_cst_p (&vr0)
&& range_int_cst_p (&vr1)
&& TYPE_OVERFLOW_WRAPS (expr_type))
{
- double_int min0, max0, min1, max1, sizem1, size;
- double_int prod0l, prod0h, prod1l, prod1h,
- prod2l, prod2h, prod3l, prod3h;
- bool uns0, uns1, uns;
-
- sizem1 = double_int::max_value (TYPE_PRECISION (expr_type), true);
- size = sizem1 + double_int_one;
-
- min0 = tree_to_double_int (vr0.min);
- max0 = tree_to_double_int (vr0.max);
- min1 = tree_to_double_int (vr1.min);
- max1 = tree_to_double_int (vr1.max);
-
- uns0 = TYPE_UNSIGNED (expr_type);
- uns1 = uns0;
-
+ typedef FIXED_WIDE_INT (WIDE_INT_MAX_PRECISION * 2) vrp_int;
+ typedef generic_wide_int
+ <wi::extended_tree <WIDE_INT_MAX_PRECISION * 2> > vrp_int_cst;
+ vrp_int sizem1 = wi::mask <vrp_int> (prec, false);
+ vrp_int size = sizem1 + 1;
+
+ /* Extend the values using the sign of the result to PREC2.
+ From here on out, everthing is just signed math no matter
+ what the input types were. */
+ vrp_int min0 = vrp_int_cst (vr0.min);
+ vrp_int max0 = vrp_int_cst (vr0.max);
+ vrp_int min1 = vrp_int_cst (vr1.min);
+ vrp_int max1 = vrp_int_cst (vr1.max);
/* Canonicalize the intervals. */
- if (TYPE_UNSIGNED (expr_type))
+ if (sign == UNSIGNED)
{
- double_int min2 = size - min0;
- if (!min2.is_zero () && min2.cmp (max0, true) < 0)
+ if (wi::ltu_p (size, min0 + max0))
{
- min0 = -min2;
+ min0 -= size;
max0 -= size;
- uns0 = false;
}
- min2 = size - min1;
- if (!min2.is_zero () && min2.cmp (max1, true) < 0)
+ if (wi::ltu_p (size, min1 + max1))
{
- min1 = -min2;
+ min1 -= size;
max1 -= size;
- uns1 = false;
}
}
- uns = uns0 & uns1;
- bool overflow;
- prod0l = min0.wide_mul_with_sign (min1, true, &prod0h, &overflow);
- if (!uns0 && min0.is_negative ())
- prod0h -= min1;
- if (!uns1 && min1.is_negative ())
- prod0h -= min0;
-
- prod1l = min0.wide_mul_with_sign (max1, true, &prod1h, &overflow);
- if (!uns0 && min0.is_negative ())
- prod1h -= max1;
- if (!uns1 && max1.is_negative ())
- prod1h -= min0;
-
- prod2l = max0.wide_mul_with_sign (min1, true, &prod2h, &overflow);
- if (!uns0 && max0.is_negative ())
- prod2h -= min1;
- if (!uns1 && min1.is_negative ())
- prod2h -= max0;
-
- prod3l = max0.wide_mul_with_sign (max1, true, &prod3h, &overflow);
- if (!uns0 && max0.is_negative ())
- prod3h -= max1;
- if (!uns1 && max1.is_negative ())
- prod3h -= max0;
-
- /* Sort the 4 products. */
- quad_int_pair_sort (&prod0l, &prod0h, &prod3l, &prod3h, uns);
- quad_int_pair_sort (&prod1l, &prod1h, &prod2l, &prod2h, uns);
- quad_int_pair_sort (&prod0l, &prod0h, &prod1l, &prod1h, uns);
- quad_int_pair_sort (&prod2l, &prod2h, &prod3l, &prod3h, uns);
-
- /* Max - min. */
- if (prod0l.is_zero ())
- {
- prod1l = double_int_zero;
- prod1h = -prod0h;
- }
- else
- {
- prod1l = -prod0l;
- prod1h = ~prod0h;
- }
- prod2l = prod3l + prod1l;
- prod2h = prod3h + prod1h;
- if (prod2l.ult (prod3l))
- prod2h += double_int_one; /* carry */
+ vrp_int prod0 = min0 * min1;
+ vrp_int prod1 = min0 * max1;
+ vrp_int prod2 = max0 * min1;
+ vrp_int prod3 = max0 * max1;
+
+ /* Sort the 4 products so that min is in prod0 and max is in
+ prod3. */
+ /* min0min1 > max0max1 */
+ if (wi::gts_p (prod0, prod3))
+ std::swap (prod0, prod3);
+
+ /* min0max1 > max0min1 */
+ if (wi::gts_p (prod1, prod2))
+ std::swap (prod1, prod2);
+
+ if (wi::gts_p (prod0, prod1))
+ std::swap (prod0, prod1);
- if (!prod2h.is_zero ()
- || prod2l.cmp (sizem1, true) >= 0)
+ if (wi::gts_p (prod2, prod3))
+ std::swap (prod2, prod3);
+
+ /* diff = max - min. */
+ prod2 = prod3 - prod0;
+ if (wi::geu_p (prod2, sizem1))
{
/* the range covers all values. */
set_value_range_to_varying (vr);
/* The following should handle the wrapping and selecting
VR_ANTI_RANGE for us. */
- min = double_int_to_tree (expr_type, prod0l);
- max = double_int_to_tree (expr_type, prod3l);
+ min = wide_int_to_tree (expr_type, prod0);
+ max = wide_int_to_tree (expr_type, prod3);
set_and_canonicalize_value_range (vr, VR_RANGE, min, max, NULL);
return;
}
{
if (code == RSHIFT_EXPR)
{
+ /* Even if vr0 is VARYING or otherwise not usable, we can derive
+ useful ranges just from the shift count. E.g.
+ x >> 63 for signed 64-bit x is always [-1, 0]. */
+ if (vr0.type != VR_RANGE || symbolic_range_p (&vr0))
+ {
+ vr0.type = type = VR_RANGE;
+ vr0.min = vrp_val_min (expr_type);
+ vr0.max = vrp_val_max (expr_type);
+ }
extract_range_from_multiplicative_op_1 (vr, code, &vr0, &vr1);
return;
}
bool saved_flag_wrapv;
value_range_t vr1p = VR_INITIALIZER;
vr1p.type = VR_RANGE;
- vr1p.min
- = double_int_to_tree (expr_type,
- double_int_one
- .llshift (TREE_INT_CST_LOW (vr1.min),
- TYPE_PRECISION (expr_type)));
+ vr1p.min = (wide_int_to_tree
+ (expr_type,
+ wi::set_bit_in_zero (tree_to_shwi (vr1.min),
+ TYPE_PRECISION (expr_type))));
vr1p.max = vr1p.min;
/* We have to use a wrapping multiply though as signed overflow
on lshifts is implementation defined in C89. */
int prec = TYPE_PRECISION (expr_type);
int overflow_pos = prec;
int bound_shift;
- double_int bound, complement, low_bound, high_bound;
+ wide_int low_bound, high_bound;
bool uns = TYPE_UNSIGNED (expr_type);
bool in_bounds = false;
if (!uns)
overflow_pos -= 1;
- bound_shift = overflow_pos - TREE_INT_CST_LOW (vr1.max);
- /* If bound_shift == HOST_BITS_PER_DOUBLE_INT, the llshift can
+ bound_shift = overflow_pos - tree_to_shwi (vr1.max);
+ /* If bound_shift == HOST_BITS_PER_WIDE_INT, the llshift can
overflow. However, for that to happen, vr1.max needs to be
zero, which means vr1 is a singleton range of zero, which
means it should be handled by the previous LSHIFT_EXPR
if-clause. */
- bound = double_int_one.llshift (bound_shift, prec);
- complement = ~(bound - double_int_one);
+ wide_int bound = wi::set_bit_in_zero (bound_shift, prec);
+ wide_int complement = ~(bound - 1);
if (uns)
{
- low_bound = bound.zext (prec);
- high_bound = complement.zext (prec);
- if (tree_to_double_int (vr0.max).ult (low_bound))
+ low_bound = bound;
+ high_bound = complement;
+ if (wi::ltu_p (vr0.max, low_bound))
{
/* [5, 6] << [1, 2] == [10, 24]. */
/* We're shifting out only zeroes, the value increases
monotonically. */
in_bounds = true;
}
- else if (high_bound.ult (tree_to_double_int (vr0.min)))
+ else if (wi::ltu_p (high_bound, vr0.min))
{
/* [0xffffff00, 0xffffffff] << [1, 2]
== [0xfffffc00, 0xfffffffe]. */
else
{
/* [-1, 1] << [1, 2] == [-4, 4]. */
- low_bound = complement.sext (prec);
+ low_bound = complement;
high_bound = bound;
- if (tree_to_double_int (vr0.max).slt (high_bound)
- && low_bound.slt (tree_to_double_int (vr0.min)))
+ if (wi::lts_p (vr0.max, high_bound)
+ && wi::lts_p (low_bound, vr0.min))
{
/* For non-negative numbers, we're shifting out only
zeroes, the value increases monotonically.
and all numbers from min to 0 for negative min. */
cmp = compare_values (vr0.max, zero);
if (cmp == -1)
- max = zero;
+ {
+ /* When vr0.max < 0, vr1.min != 0 and value
+ ranges for dividend and divisor are available. */
+ if (vr1.type == VR_RANGE
+ && !symbolic_range_p (&vr0)
+ && !symbolic_range_p (&vr1)
+ && !compare_values (vr1.min, zero))
+ max = int_const_binop (code, vr0.max, vr1.min);
+ else
+ max = zero;
+ }
else if (cmp == 0 || cmp == 1)
max = vr0.max;
else
type = VR_VARYING;
cmp = compare_values (vr0.min, zero);
if (cmp == 1)
- min = zero;
+ {
+ /* For unsigned division when value ranges for dividend
+ and divisor are available. */
+ if (vr1.type == VR_RANGE
+ && !symbolic_range_p (&vr0)
+ && !symbolic_range_p (&vr1))
+ min = int_const_binop (code, vr0.min, vr1.max);
+ else
+ min = zero;
+ }
else if (cmp == 0 || cmp == -1)
min = vr0.min;
else
}
else if (code == TRUNC_MOD_EXPR)
{
- if (vr1.type != VR_RANGE
- || range_includes_zero_p (vr1.min, vr1.max) != 0
- || vrp_val_is_min (vr1.min))
+ if (range_is_null (&vr1))
{
- set_value_range_to_varying (vr);
+ set_value_range_to_undefined (vr);
return;
}
+ /* ABS (A % B) < ABS (B) and either
+ 0 <= A % B <= A or A <= A % B <= 0. */
type = VR_RANGE;
- /* Compute MAX <|vr1.min|, |vr1.max|> - 1. */
- max = fold_unary_to_constant (ABS_EXPR, expr_type, vr1.min);
- if (tree_int_cst_lt (max, vr1.max))
- max = vr1.max;
- max = int_const_binop (MINUS_EXPR, max, integer_one_node);
- /* If the dividend is non-negative the modulus will be
- non-negative as well. */
- if (TYPE_UNSIGNED (expr_type)
- || value_range_nonnegative_p (&vr0))
- min = build_int_cst (TREE_TYPE (max), 0);
+ signop sgn = TYPE_SIGN (expr_type);
+ unsigned int prec = TYPE_PRECISION (expr_type);
+ wide_int wmin, wmax, tmp;
+ wide_int zero = wi::zero (prec);
+ wide_int one = wi::one (prec);
+ if (vr1.type == VR_RANGE && !symbolic_range_p (&vr1))
+ {
+ wmax = wi::sub (vr1.max, one);
+ if (sgn == SIGNED)
+ {
+ tmp = wi::sub (wi::minus_one (prec), vr1.min);
+ wmax = wi::smax (wmax, tmp);
+ }
+ }
+ else
+ {
+ wmax = wi::max_value (prec, sgn);
+ /* X % INT_MIN may be INT_MAX. */
+ if (sgn == UNSIGNED)
+ wmax = wmax - one;
+ }
+
+ if (sgn == UNSIGNED)
+ wmin = zero;
else
- min = fold_unary_to_constant (NEGATE_EXPR, expr_type, max);
+ {
+ wmin = -wmax;
+ if (vr0.type == VR_RANGE && TREE_CODE (vr0.min) == INTEGER_CST)
+ {
+ tmp = vr0.min;
+ if (wi::gts_p (tmp, zero))
+ tmp = zero;
+ wmin = wi::smax (wmin, tmp);
+ }
+ }
+
+ if (vr0.type == VR_RANGE && TREE_CODE (vr0.max) == INTEGER_CST)
+ {
+ tmp = vr0.max;
+ if (sgn == SIGNED && wi::neg_p (tmp))
+ tmp = zero;
+ wmax = wi::min (wmax, tmp, sgn);
+ }
+
+ min = wide_int_to_tree (expr_type, wmin);
+ max = wide_int_to_tree (expr_type, wmax);
}
else if (code == BIT_AND_EXPR || code == BIT_IOR_EXPR || code == BIT_XOR_EXPR)
{
bool int_cst_range0, int_cst_range1;
- double_int may_be_nonzero0, may_be_nonzero1;
- double_int must_be_nonzero0, must_be_nonzero1;
+ wide_int may_be_nonzero0, may_be_nonzero1;
+ wide_int must_be_nonzero0, must_be_nonzero1;
- int_cst_range0 = zero_nonzero_bits_from_vr (&vr0, &may_be_nonzero0,
+ int_cst_range0 = zero_nonzero_bits_from_vr (expr_type, &vr0,
+ &may_be_nonzero0,
&must_be_nonzero0);
- int_cst_range1 = zero_nonzero_bits_from_vr (&vr1, &may_be_nonzero1,
+ int_cst_range1 = zero_nonzero_bits_from_vr (expr_type, &vr1,
+ &may_be_nonzero1,
&must_be_nonzero1);
type = VR_RANGE;
if (code == BIT_AND_EXPR)
{
- double_int dmax;
- min = double_int_to_tree (expr_type,
- must_be_nonzero0 & must_be_nonzero1);
- dmax = may_be_nonzero0 & may_be_nonzero1;
+ min = wide_int_to_tree (expr_type,
+ must_be_nonzero0 & must_be_nonzero1);
+ wide_int wmax = may_be_nonzero0 & may_be_nonzero1;
/* If both input ranges contain only negative values we can
truncate the result range maximum to the minimum of the
input range maxima. */
&& tree_int_cst_sgn (vr0.max) < 0
&& tree_int_cst_sgn (vr1.max) < 0)
{
- dmax = dmax.min (tree_to_double_int (vr0.max),
- TYPE_UNSIGNED (expr_type));
- dmax = dmax.min (tree_to_double_int (vr1.max),
- TYPE_UNSIGNED (expr_type));
+ wmax = wi::min (wmax, vr0.max, TYPE_SIGN (expr_type));
+ wmax = wi::min (wmax, vr1.max, TYPE_SIGN (expr_type));
}
/* If either input range contains only non-negative values
we can truncate the result range maximum to the respective
maximum of the input range. */
if (int_cst_range0 && tree_int_cst_sgn (vr0.min) >= 0)
- dmax = dmax.min (tree_to_double_int (vr0.max),
- TYPE_UNSIGNED (expr_type));
+ wmax = wi::min (wmax, vr0.max, TYPE_SIGN (expr_type));
if (int_cst_range1 && tree_int_cst_sgn (vr1.min) >= 0)
- dmax = dmax.min (tree_to_double_int (vr1.max),
- TYPE_UNSIGNED (expr_type));
- max = double_int_to_tree (expr_type, dmax);
+ wmax = wi::min (wmax, vr1.max, TYPE_SIGN (expr_type));
+ max = wide_int_to_tree (expr_type, wmax);
}
else if (code == BIT_IOR_EXPR)
{
- double_int dmin;
- max = double_int_to_tree (expr_type,
- may_be_nonzero0 | may_be_nonzero1);
- dmin = must_be_nonzero0 | must_be_nonzero1;
+ max = wide_int_to_tree (expr_type,
+ may_be_nonzero0 | may_be_nonzero1);
+ wide_int wmin = must_be_nonzero0 | must_be_nonzero1;
/* If the input ranges contain only positive values we can
truncate the minimum of the result range to the maximum
of the input range minima. */
&& tree_int_cst_sgn (vr0.min) >= 0
&& tree_int_cst_sgn (vr1.min) >= 0)
{
- dmin = dmin.max (tree_to_double_int (vr0.min),
- TYPE_UNSIGNED (expr_type));
- dmin = dmin.max (tree_to_double_int (vr1.min),
- TYPE_UNSIGNED (expr_type));
+ wmin = wi::max (wmin, vr0.min, TYPE_SIGN (expr_type));
+ wmin = wi::max (wmin, vr1.min, TYPE_SIGN (expr_type));
}
/* If either input range contains only negative values
we can truncate the minimum of the result range to the
respective minimum range. */
if (int_cst_range0 && tree_int_cst_sgn (vr0.max) < 0)
- dmin = dmin.max (tree_to_double_int (vr0.min),
- TYPE_UNSIGNED (expr_type));
+ wmin = wi::max (wmin, vr0.min, TYPE_SIGN (expr_type));
if (int_cst_range1 && tree_int_cst_sgn (vr1.max) < 0)
- dmin = dmin.max (tree_to_double_int (vr1.min),
- TYPE_UNSIGNED (expr_type));
- min = double_int_to_tree (expr_type, dmin);
+ wmin = wi::max (wmin, vr1.min, TYPE_SIGN (expr_type));
+ min = wide_int_to_tree (expr_type, wmin);
}
else if (code == BIT_XOR_EXPR)
{
- double_int result_zero_bits, result_one_bits;
- result_zero_bits = (must_be_nonzero0 & must_be_nonzero1)
- | ~(may_be_nonzero0 | may_be_nonzero1);
- result_one_bits = must_be_nonzero0.and_not (may_be_nonzero1)
- | must_be_nonzero1.and_not (may_be_nonzero0);
- max = double_int_to_tree (expr_type, ~result_zero_bits);
- min = double_int_to_tree (expr_type, result_one_bits);
+ wide_int result_zero_bits = ((must_be_nonzero0 & must_be_nonzero1)
+ | ~(may_be_nonzero0 | may_be_nonzero1));
+ wide_int result_one_bits
+ = (must_be_nonzero0.and_not (may_be_nonzero1)
+ | must_be_nonzero1.and_not (may_be_nonzero0));
+ max = wide_int_to_tree (expr_type, ~result_zero_bits);
+ min = wide_int_to_tree (expr_type, result_one_bits);
/* If the range has all positive or all negative values the
result is better than VARYING. */
if (tree_int_cst_sgn (min) < 0
gcc_unreachable ();
/* If either MIN or MAX overflowed, then set the resulting range to
- VARYING. But we do accept an overflow infinity
- representation. */
+ VARYING. But we do accept an overflow infinity representation. */
if (min == NULL_TREE
- || !is_gimple_min_invariant (min)
- || (TREE_OVERFLOW (min) && !is_overflow_infinity (min))
+ || (TREE_OVERFLOW_P (min) && !is_overflow_infinity (min))
|| max == NULL_TREE
- || !is_gimple_min_invariant (max)
- || (TREE_OVERFLOW (max) && !is_overflow_infinity (max)))
+ || (TREE_OVERFLOW_P (max) && !is_overflow_infinity (max)))
{
set_value_range_to_varying (vr);
return;
set_value_range_to_varying (&vr1);
extract_range_from_binary_expr_1 (vr, code, expr_type, &vr0, &vr1);
+
+ /* Try harder for PLUS and MINUS if the range of one operand is symbolic
+ and based on the other operand, for example if it was deduced from a
+ symbolic comparison. When a bound of the range of the first operand
+ is invariant, we set the corresponding bound of the new range to INF
+ in order to avoid recursing on the range of the second operand. */
+ if (vr->type == VR_VARYING
+ && (code == PLUS_EXPR || code == MINUS_EXPR)
+ && TREE_CODE (op1) == SSA_NAME
+ && vr0.type == VR_RANGE
+ && symbolic_range_based_on_p (&vr0, op1))
+ {
+ const bool minus_p = (code == MINUS_EXPR);
+ value_range_t n_vr1 = VR_INITIALIZER;
+
+ /* Try with VR0 and [-INF, OP1]. */
+ if (is_gimple_min_invariant (minus_p ? vr0.max : vr0.min))
+ set_value_range (&n_vr1, VR_RANGE, vrp_val_min (expr_type), op1, NULL);
+
+ /* Try with VR0 and [OP1, +INF]. */
+ else if (is_gimple_min_invariant (minus_p ? vr0.min : vr0.max))
+ set_value_range (&n_vr1, VR_RANGE, op1, vrp_val_max (expr_type), NULL);
+
+ /* Try with VR0 and [OP1, OP1]. */
+ else
+ set_value_range (&n_vr1, VR_RANGE, op1, op1, NULL);
+
+ extract_range_from_binary_expr_1 (vr, code, expr_type, &vr0, &n_vr1);
+ }
+
+ if (vr->type == VR_VARYING
+ && (code == PLUS_EXPR || code == MINUS_EXPR)
+ && TREE_CODE (op0) == SSA_NAME
+ && vr1.type == VR_RANGE
+ && symbolic_range_based_on_p (&vr1, op0))
+ {
+ const bool minus_p = (code == MINUS_EXPR);
+ value_range_t n_vr0 = VR_INITIALIZER;
+
+ /* Try with [-INF, OP0] and VR1. */
+ if (is_gimple_min_invariant (minus_p ? vr1.max : vr1.min))
+ set_value_range (&n_vr0, VR_RANGE, vrp_val_min (expr_type), op0, NULL);
+
+ /* Try with [OP0, +INF] and VR1. */
+ else if (is_gimple_min_invariant (minus_p ? vr1.min : vr1.max))
+ set_value_range (&n_vr0, VR_RANGE, op0, vrp_val_max (expr_type), NULL);
+
+ /* Try with [OP0, OP0] and VR1. */
+ else
+ set_value_range (&n_vr0, VR_RANGE, op0, op0, NULL);
+
+ extract_range_from_binary_expr_1 (vr, code, expr_type, &n_vr0, &vr1);
+ }
}
/* Extract range information from a unary operation CODE based on
}
/* Handle operations that we express in terms of others. */
- if (code == PAREN_EXPR)
+ if (code == PAREN_EXPR || code == OBJ_TYPE_REF)
{
- /* PAREN_EXPR is a simple copy. */
+ /* PAREN_EXPR and OBJ_TYPE_REF are simple copies. */
copy_value_range (vr, &vr0);
return;
}
if (is_overflow_infinity (vr0.min))
new_min = negative_overflow_infinity (outer_type);
else
- new_min = force_fit_type_double (outer_type,
- tree_to_double_int (vr0.min),
- 0, false);
+ new_min = force_fit_type (outer_type, wi::to_widest (vr0.min),
+ 0, false);
if (is_overflow_infinity (vr0.max))
new_max = positive_overflow_infinity (outer_type);
else
- new_max = force_fit_type_double (outer_type,
- tree_to_double_int (vr0.max),
- 0, false);
+ new_max = force_fit_type (outer_type, wi::to_widest (vr0.max),
+ 0, false);
set_and_canonicalize_value_range (vr, vr0.type,
new_min, new_max, NULL);
return;
min = (vr0.min != type_min_value
? int_const_binop (PLUS_EXPR, type_min_value,
- integer_one_node)
+ build_int_cst (TREE_TYPE (type_min_value), 1))
: type_min_value);
}
else
{
/* If the range was reversed, swap MIN and MAX. */
if (cmp == 1)
- {
- tree t = min;
- min = max;
- max = t;
- }
+ std::swap (min, max);
}
cmp = compare_values (min, max);
the ranges of each of its operands and the expression code. */
static void
-extract_range_from_cond_expr (value_range_t *vr, gimple stmt)
+extract_range_from_cond_expr (value_range_t *vr, gassign *stmt)
{
tree op0, op1;
value_range_t vr0 = VR_INITIALIZER;
set_value_range_to_truthvalue (vr, type);
}
+/* Helper function for simplify_internal_call_using_ranges and
+ extract_range_basic. Return true if OP0 SUBCODE OP1 for
+ SUBCODE {PLUS,MINUS,MULT}_EXPR is known to never overflow or
+ always overflow. Set *OVF to true if it is known to always
+ overflow. */
+
+static bool
+check_for_binary_op_overflow (enum tree_code subcode, tree type,
+ tree op0, tree op1, bool *ovf)
+{
+ value_range_t vr0 = VR_INITIALIZER;
+ value_range_t vr1 = VR_INITIALIZER;
+ if (TREE_CODE (op0) == SSA_NAME)
+ vr0 = *get_value_range (op0);
+ else if (TREE_CODE (op0) == INTEGER_CST)
+ set_value_range_to_value (&vr0, op0, NULL);
+ else
+ set_value_range_to_varying (&vr0);
+
+ if (TREE_CODE (op1) == SSA_NAME)
+ vr1 = *get_value_range (op1);
+ else if (TREE_CODE (op1) == INTEGER_CST)
+ set_value_range_to_value (&vr1, op1, NULL);
+ else
+ set_value_range_to_varying (&vr1);
+
+ if (!range_int_cst_p (&vr0)
+ || TREE_OVERFLOW (vr0.min)
+ || TREE_OVERFLOW (vr0.max))
+ {
+ vr0.min = vrp_val_min (TREE_TYPE (op0));
+ vr0.max = vrp_val_max (TREE_TYPE (op0));
+ }
+ if (!range_int_cst_p (&vr1)
+ || TREE_OVERFLOW (vr1.min)
+ || TREE_OVERFLOW (vr1.max))
+ {
+ vr1.min = vrp_val_min (TREE_TYPE (op1));
+ vr1.max = vrp_val_max (TREE_TYPE (op1));
+ }
+ *ovf = arith_overflowed_p (subcode, type, vr0.min,
+ subcode == MINUS_EXPR ? vr1.max : vr1.min);
+ if (arith_overflowed_p (subcode, type, vr0.max,
+ subcode == MINUS_EXPR ? vr1.min : vr1.max) != *ovf)
+ return false;
+ if (subcode == MULT_EXPR)
+ {
+ if (arith_overflowed_p (subcode, type, vr0.min, vr1.max) != *ovf
+ || arith_overflowed_p (subcode, type, vr0.max, vr1.min) != *ovf)
+ return false;
+ }
+ if (*ovf)
+ {
+ /* So far we found that there is an overflow on the boundaries.
+ That doesn't prove that there is an overflow even for all values
+ in between the boundaries. For that compute widest_int range
+ of the result and see if it doesn't overlap the range of
+ type. */
+ widest_int wmin, wmax;
+ widest_int w[4];
+ int i;
+ w[0] = wi::to_widest (vr0.min);
+ w[1] = wi::to_widest (vr0.max);
+ w[2] = wi::to_widest (vr1.min);
+ w[3] = wi::to_widest (vr1.max);
+ for (i = 0; i < 4; i++)
+ {
+ widest_int wt;
+ switch (subcode)
+ {
+ case PLUS_EXPR:
+ wt = wi::add (w[i & 1], w[2 + (i & 2) / 2]);
+ break;
+ case MINUS_EXPR:
+ wt = wi::sub (w[i & 1], w[2 + (i & 2) / 2]);
+ break;
+ case MULT_EXPR:
+ wt = wi::mul (w[i & 1], w[2 + (i & 2) / 2]);
+ break;
+ default:
+ gcc_unreachable ();
+ }
+ if (i == 0)
+ {
+ wmin = wt;
+ wmax = wt;
+ }
+ else
+ {
+ wmin = wi::smin (wmin, wt);
+ wmax = wi::smax (wmax, wt);
+ }
+ }
+ /* The result of op0 CODE op1 is known to be in range
+ [wmin, wmax]. */
+ widest_int wtmin = wi::to_widest (vrp_val_min (type));
+ widest_int wtmax = wi::to_widest (vrp_val_max (type));
+ /* If all values in [wmin, wmax] are smaller than
+ [wtmin, wtmax] or all are larger than [wtmin, wtmax],
+ the arithmetic operation will always overflow. */
+ if (wi::lts_p (wmax, wtmin) || wi::gts_p (wmin, wtmax))
+ return true;
+ return false;
+ }
+ return true;
+}
+
/* Try to derive a nonnegative or nonzero range out of STMT relying
primarily on generic routines in fold in conjunction with range data.
Store the result in *VR */
/* If arg is non-zero, then ffs or popcount
are non-zero. */
if (((vr0->type == VR_RANGE
- && integer_nonzerop (vr0->min))
+ && range_includes_zero_p (vr0->min, vr0->max) == 0)
|| (vr0->type == VR_ANTI_RANGE
- && integer_zerop (vr0->min)))
- && !is_overflow_infinity (vr0->min))
+ && range_includes_zero_p (vr0->min, vr0->max) == 1))
+ && !is_overflow_infinity (vr0->min)
+ && !is_overflow_infinity (vr0->max))
mini = 1;
/* If some high bits are known to be zero,
we can decrease the maximum. */
if (vr0->type == VR_RANGE
&& TREE_CODE (vr0->max) == INTEGER_CST
+ && !operand_less_p (vr0->min,
+ build_zero_cst (TREE_TYPE (vr0->min)))
&& !is_overflow_infinity (vr0->max))
maxi = tree_floor_log2 (vr0->max) + 1;
}
break;
}
}
+ else if (is_gimple_call (stmt) && gimple_call_internal_p (stmt))
+ {
+ enum tree_code subcode = ERROR_MARK;
+ switch (gimple_call_internal_fn (stmt))
+ {
+ case IFN_UBSAN_CHECK_ADD:
+ subcode = PLUS_EXPR;
+ break;
+ case IFN_UBSAN_CHECK_SUB:
+ subcode = MINUS_EXPR;
+ break;
+ case IFN_UBSAN_CHECK_MUL:
+ subcode = MULT_EXPR;
+ break;
+ default:
+ break;
+ }
+ if (subcode != ERROR_MARK)
+ {
+ bool saved_flag_wrapv = flag_wrapv;
+ /* Pretend the arithmetics is wrapping. If there is
+ any overflow, we'll complain, but will actually do
+ wrapping operation. */
+ flag_wrapv = 1;
+ extract_range_from_binary_expr (vr, subcode, type,
+ gimple_call_arg (stmt, 0),
+ gimple_call_arg (stmt, 1));
+ flag_wrapv = saved_flag_wrapv;
+
+ /* If for both arguments vrp_valueize returned non-NULL,
+ this should have been already folded and if not, it
+ wasn't folded because of overflow. Avoid removing the
+ UBSAN_CHECK_* calls in that case. */
+ if (vr->type == VR_RANGE
+ && (vr->min == vr->max
+ || operand_equal_p (vr->min, vr->max, 0)))
+ set_value_range_to_varying (vr);
+ return;
+ }
+ }
+ /* Handle extraction of the two results (result of arithmetics and
+ a flag whether arithmetics overflowed) from {ADD,SUB,MUL}_OVERFLOW
+ internal function. */
+ else if (is_gimple_assign (stmt)
+ && (gimple_assign_rhs_code (stmt) == REALPART_EXPR
+ || gimple_assign_rhs_code (stmt) == IMAGPART_EXPR)
+ && INTEGRAL_TYPE_P (type))
+ {
+ enum tree_code code = gimple_assign_rhs_code (stmt);
+ tree op = gimple_assign_rhs1 (stmt);
+ if (TREE_CODE (op) == code && TREE_CODE (TREE_OPERAND (op, 0)) == SSA_NAME)
+ {
+ gimple g = SSA_NAME_DEF_STMT (TREE_OPERAND (op, 0));
+ if (is_gimple_call (g) && gimple_call_internal_p (g))
+ {
+ enum tree_code subcode = ERROR_MARK;
+ switch (gimple_call_internal_fn (g))
+ {
+ case IFN_ADD_OVERFLOW:
+ subcode = PLUS_EXPR;
+ break;
+ case IFN_SUB_OVERFLOW:
+ subcode = MINUS_EXPR;
+ break;
+ case IFN_MUL_OVERFLOW:
+ subcode = MULT_EXPR;
+ break;
+ default:
+ break;
+ }
+ if (subcode != ERROR_MARK)
+ {
+ tree op0 = gimple_call_arg (g, 0);
+ tree op1 = gimple_call_arg (g, 1);
+ if (code == IMAGPART_EXPR)
+ {
+ bool ovf = false;
+ if (check_for_binary_op_overflow (subcode, type,
+ op0, op1, &ovf))
+ set_value_range_to_value (vr,
+ build_int_cst (type, ovf),
+ NULL);
+ else
+ set_value_range (vr, VR_RANGE, build_int_cst (type, 0),
+ build_int_cst (type, 1), NULL);
+ }
+ else if (types_compatible_p (type, TREE_TYPE (op0))
+ && types_compatible_p (type, TREE_TYPE (op1)))
+ {
+ bool saved_flag_wrapv = flag_wrapv;
+ /* Pretend the arithmetics is wrapping. If there is
+ any overflow, IMAGPART_EXPR will be set. */
+ flag_wrapv = 1;
+ extract_range_from_binary_expr (vr, subcode, type,
+ op0, op1);
+ flag_wrapv = saved_flag_wrapv;
+ }
+ else
+ {
+ value_range_t vr0 = VR_INITIALIZER;
+ value_range_t vr1 = VR_INITIALIZER;
+ bool saved_flag_wrapv = flag_wrapv;
+ /* Pretend the arithmetics is wrapping. If there is
+ any overflow, IMAGPART_EXPR will be set. */
+ flag_wrapv = 1;
+ extract_range_from_unary_expr (&vr0, NOP_EXPR,
+ type, op0);
+ extract_range_from_unary_expr (&vr1, NOP_EXPR,
+ type, op1);
+ extract_range_from_binary_expr_1 (vr, subcode, type,
+ &vr0, &vr1);
+ flag_wrapv = saved_flag_wrapv;
+ }
+ return;
+ }
+ }
+ }
+ }
if (INTEGRAL_TYPE_P (type)
&& gimple_stmt_nonnegative_warnv_p (stmt, &sop))
set_value_range_to_nonnegative (vr, type,
in *VR. */
static void
-extract_range_from_assignment (value_range_t *vr, gimple stmt)
+extract_range_from_assignment (value_range_t *vr, gassign *stmt)
{
enum tree_code code = gimple_assign_rhs_code (stmt);
&& (TREE_CODE (init) != SSA_NAME
|| get_value_range (init)->type == VR_RANGE))
{
- double_int nit;
+ widest_int nit;
/* We are only entering here for loop header PHI nodes, so using
the number of latch executions is the correct thing to use. */
if (max_loop_iterations (loop, &nit))
{
value_range_t maxvr = VR_INITIALIZER;
- double_int dtmp;
- bool unsigned_p = TYPE_UNSIGNED (TREE_TYPE (step));
- bool overflow = false;
+ signop sgn = TYPE_SIGN (TREE_TYPE (step));
+ bool overflow;
- dtmp = tree_to_double_int (step)
- .mul_with_sign (nit, unsigned_p, &overflow);
+ widest_int wtmp = wi::mul (wi::to_widest (step), nit, sgn,
+ &overflow);
/* If the multiplication overflowed we can't do a meaningful
adjustment. Likewise if the result doesn't fit in the type
of the induction variable. For a signed type we have to
check whether the result has the expected signedness which
is that of the step as number of iterations is unsigned. */
if (!overflow
- && double_int_fits_to_tree_p (TREE_TYPE (init), dtmp)
- && (unsigned_p
- || ((dtmp.high ^ TREE_INT_CST_HIGH (step)) >= 0)))
+ && wi::fits_to_tree_p (wtmp, TREE_TYPE (init))
+ && (sgn == UNSIGNED
+ || wi::gts_p (wtmp, 0) == wi::gts_p (step, 0)))
{
- tem = double_int_to_tree (TREE_TYPE (init), dtmp);
+ tem = wide_int_to_tree (TREE_TYPE (init), wtmp);
extract_range_from_binary_expr (&maxvr, PLUS_EXPR,
TREE_TYPE (init), init, tem);
/* Likewise if the addition did. */
max = init;
else
min = init;
-
- /* If we would create an invalid range, then just assume we
- know absolutely nothing. This may be over-conservative,
- but it's clearly safe, and should happen only in unreachable
- parts of code, or for invalid programs. */
- if (compare_values (min, max) == 1)
- return;
-
- set_value_range (vr, VR_RANGE, min, max, vr->equiv);
}
else if (vr->type == VR_RANGE)
{
|| compare_values (tmax, max) == -1)
max = tmax;
}
-
- /* If we just created an invalid range with the minimum
- greater than the maximum, we fail conservatively.
- This should happen only in unreachable
- parts of code, or for invalid programs. */
- if (compare_values (min, max) == 1)
- return;
-
- set_value_range (vr, VR_RANGE, min, max, vr->equiv);
}
-}
-
-/* Return true if VAR may overflow at STMT. This checks any available
- loop information to see if we can determine that VAR does not
- overflow. */
-
-static bool
-vrp_var_may_overflow (tree var, gimple stmt)
-{
- struct loop *l;
- tree chrec, init, step;
-
- if (current_loops == NULL)
- return true;
-
- l = loop_containing_stmt (stmt);
- if (l == NULL
- || !loop_outer (l))
- return true;
-
- chrec = instantiate_parameters (l, analyze_scalar_evolution (l, var));
- if (TREE_CODE (chrec) != POLYNOMIAL_CHREC)
- return true;
-
- init = initial_condition_in_loop_num (chrec, l->num);
- step = evolution_part_in_loop_num (chrec, l->num);
-
- if (step == NULL_TREE
- || !is_gimple_min_invariant (step)
- || !valid_value_p (init))
- return true;
-
- /* If we get here, we know something useful about VAR based on the
- loop information. If it wraps, it may overflow. */
-
- if (scev_probably_wraps_p (init, step, stmt, get_chrec_loop (chrec),
- true))
- return true;
+ else
+ return;
- if (dump_file && (dump_flags & TDF_DETAILS) != 0)
- {
- print_generic_expr (dump_file, var, 0);
- fprintf (dump_file, ": loop information indicates does not overflow\n");
- }
+ /* If we just created an invalid range with the minimum
+ greater than the maximum, we fail conservatively.
+ This should happen only in unreachable
+ parts of code, or for invalid programs. */
+ if (compare_values (min, max) == 1
+ || (is_negative_overflow_infinity (min)
+ && is_positive_overflow_infinity (max)))
+ return;
- return false;
+ set_value_range (vr, VR_RANGE, min, max, vr->equiv);
}
operands around and change the comparison code. */
if (comp == GT_EXPR || comp == GE_EXPR)
{
- value_range_t *tmp;
comp = (comp == GT_EXPR) ? LT_EXPR : LE_EXPR;
- tmp = vr0;
- vr0 = vr1;
- vr1 = tmp;
+ std::swap (vr0, vr1);
}
if (comp == EQ_EXPR)
/* Given a COND_EXPR COND of the form 'V OP W', and an SSA name V,
create a new SSA name N and return the assertion assignment
- 'V = ASSERT_EXPR <V, V OP W>'. */
+ 'N = ASSERT_EXPR <V, V OP W>'. */
static gimple
build_assert_expr_for (tree cond, tree v)
{
tree a;
- gimple assertion;
+ gassign *assertion;
gcc_assert (TREE_CODE (v) == SSA_NAME
&& COMPARISON_CLASS_P (cond));
if (stmt_could_throw_p (stmt))
return false;
- /* If STMT is the last statement of a basic block with no
+ /* If STMT is the last statement of a basic block with no normal
successors, there is no point inferring anything about any of its
operands. We would not be able to find a proper insertion point
for the assertion, anyway. */
- if (stmt_ends_bb_p (stmt) && EDGE_COUNT (gimple_bb (stmt)->succs) == 0)
- return false;
+ if (stmt_ends_bb_p (stmt))
+ {
+ edge_iterator ei;
+ edge e;
- if (infer_nonnull_range (stmt, op))
+ FOR_EACH_EDGE (e, ei, gimple_bb (stmt)->succs)
+ if (!(e->flags & EDGE_ABNORMAL))
+ break;
+ if (e == NULL)
+ return false;
+ }
+
+ if (infer_nonnull_range (stmt, op, true, true))
{
*val_p = build_int_cst (TREE_TYPE (op), 0);
*comp_code_p = NE_EXPR;
(to transform signed values into unsigned) and at the end xor
SGNBIT back. */
-static double_int
-masked_increment (double_int val, double_int mask, double_int sgnbit,
- unsigned int prec)
+static wide_int
+masked_increment (const wide_int &val_in, const wide_int &mask,
+ const wide_int &sgnbit, unsigned int prec)
{
- double_int bit = double_int_one, res;
+ wide_int bit = wi::one (prec), res;
unsigned int i;
- val ^= sgnbit;
+ wide_int val = val_in ^ sgnbit;
for (i = 0; i < prec; i++, bit += bit)
{
res = mask;
- if ((res & bit).is_zero ())
+ if ((res & bit) == 0)
continue;
- res = bit - double_int_one;
+ res = bit - 1;
res = (val + bit).and_not (res);
res &= mask;
- if (res.ugt (val))
+ if (wi::gtu_p (res, val))
return res ^ sgnbit;
}
return val ^ sgnbit;
/* Try to register an edge assertion for SSA name NAME on edge E for
the condition COND contributing to the conditional jump pointed to by BSI.
- Invert the condition COND if INVERT is true.
- Return true if an assertion for NAME could be registered. */
+ Invert the condition COND if INVERT is true. */
-static bool
+static void
register_edge_assert_for_2 (tree name, edge e, gimple_stmt_iterator bsi,
enum tree_code cond_code,
tree cond_op0, tree cond_op1, bool invert)
{
tree val;
enum tree_code comp_code;
- bool retval = false;
if (!extract_code_and_val_from_cond_with_ops (name, cond_code,
cond_op0,
cond_op1,
invert, &comp_code, &val))
- return false;
+ return;
/* Only register an ASSERT_EXPR if NAME was found in the sub-graph
reachable from E. */
if (live_on_edge (e, name)
&& !has_single_use (name))
- {
- register_new_assert_for (name, name, comp_code, val, NULL, e, bsi);
- retval = true;
- }
+ register_new_assert_for (name, name, comp_code, val, NULL, e, bsi);
/* In the case of NAME <= CST and NAME being defined as
NAME = (unsigned) NAME2 + CST2 we can assert NAME2 >= -CST2
}
register_new_assert_for (name3, tmp, comp_code, val, NULL, e, bsi);
-
- retval = true;
}
/* If name2 is used later, create an ASSERT_EXPR for it. */
}
register_new_assert_for (name2, tmp, comp_code, val, NULL, e, bsi);
-
- retval = true;
}
}
cst = int_const_binop (code, val, cst);
register_new_assert_for (name2, name2, comp_code, cst,
NULL, e, bsi);
- retval = true;
}
}
}
gimple def_stmt = SSA_NAME_DEF_STMT (name);
tree name2 = NULL_TREE, names[2], cst2 = NULL_TREE;
tree val2 = NULL_TREE;
- double_int mask = double_int_zero;
unsigned int prec = TYPE_PRECISION (TREE_TYPE (val));
+ wide_int mask = wi::zero (prec);
unsigned int nprec = prec;
enum tree_code rhs_code = ERROR_MARK;
register_new_assert_for (name2, tmp, new_comp_code, cst, NULL,
e, bsi);
-
- retval = true;
}
}
&& tree_fits_uhwi_p (cst2)
&& INTEGRAL_TYPE_P (TREE_TYPE (name2))
&& IN_RANGE (tree_to_uhwi (cst2), 1, prec - 1)
- && prec <= HOST_BITS_PER_DOUBLE_INT
&& prec == GET_MODE_PRECISION (TYPE_MODE (TREE_TYPE (val)))
&& live_on_edge (e, name2)
&& !has_single_use (name2))
{
- mask = double_int::mask (tree_to_uhwi (cst2));
+ mask = wi::mask (tree_to_uhwi (cst2), false, prec);
val2 = fold_binary (LSHIFT_EXPR, TREE_TYPE (val), val, cst2);
}
}
val2 = fold_convert (type, val2);
}
tmp = fold_build2 (MINUS_EXPR, TREE_TYPE (tmp), tmp, val2);
- new_val = double_int_to_tree (TREE_TYPE (tmp), mask);
+ new_val = wide_int_to_tree (TREE_TYPE (tmp), mask);
new_comp_code = comp_code == EQ_EXPR ? LE_EXPR : GT_EXPR;
}
else if (comp_code == LT_EXPR || comp_code == GE_EXPR)
{
- double_int minval
- = double_int::min_value (prec, TYPE_UNSIGNED (TREE_TYPE (val)));
+ wide_int minval
+ = wi::min_value (prec, TYPE_SIGN (TREE_TYPE (val)));
new_val = val2;
- if (minval == tree_to_double_int (new_val))
+ if (minval == new_val)
new_val = NULL_TREE;
}
else
{
- double_int maxval
- = double_int::max_value (prec, TYPE_UNSIGNED (TREE_TYPE (val)));
- mask |= tree_to_double_int (val2);
+ wide_int maxval
+ = wi::max_value (prec, TYPE_SIGN (TREE_TYPE (val)));
+ mask |= val2;
if (mask == maxval)
new_val = NULL_TREE;
else
- new_val = double_int_to_tree (TREE_TYPE (val2), mask);
+ new_val = wide_int_to_tree (TREE_TYPE (val2), mask);
}
if (new_val)
register_new_assert_for (name2, tmp, new_comp_code, new_val,
NULL, e, bsi);
- retval = true;
}
}
&& TREE_CODE (TREE_TYPE (val)) == INTEGER_TYPE
&& TYPE_UNSIGNED (TREE_TYPE (val))
&& TYPE_PRECISION (TREE_TYPE (gimple_assign_rhs1 (def_stmt)))
- > prec
- && !retval))
+ > prec))
{
name2 = gimple_assign_rhs1 (def_stmt);
if (rhs_code == BIT_AND_EXPR)
&& INTEGRAL_TYPE_P (TREE_TYPE (name2))
&& TREE_CODE (cst2) == INTEGER_CST
&& !integer_zerop (cst2)
- && nprec <= HOST_BITS_PER_DOUBLE_INT
&& (nprec > 1
|| TYPE_UNSIGNED (TREE_TYPE (val))))
{
}
if (names[0] || names[1])
{
- double_int minv, maxv = double_int_zero, valv, cst2v;
- double_int tem, sgnbit;
- bool valid_p = false, valn = false, cst2n = false;
+ wide_int minv, maxv, valv, cst2v;
+ wide_int tem, sgnbit;
+ bool valid_p = false, valn, cst2n;
enum tree_code ccode = comp_code;
- valv = tree_to_double_int (val).zext (nprec);
- cst2v = tree_to_double_int (cst2).zext (nprec);
- if (!TYPE_UNSIGNED (TREE_TYPE (val)))
- {
- valn = valv.sext (nprec).is_negative ();
- cst2n = cst2v.sext (nprec).is_negative ();
- }
+ valv = wide_int::from (val, nprec, UNSIGNED);
+ cst2v = wide_int::from (cst2, nprec, UNSIGNED);
+ valn = wi::neg_p (valv, TYPE_SIGN (TREE_TYPE (val)));
+ cst2n = wi::neg_p (cst2v, TYPE_SIGN (TREE_TYPE (val)));
/* If CST2 doesn't have most significant bit set,
but VAL is negative, we have comparison like
if ((x & 0x123) > -4) (always true). Just give up. */
if (!cst2n && valn)
ccode = ERROR_MARK;
if (cst2n)
- sgnbit = double_int_one.llshift (nprec - 1, nprec).zext (nprec);
+ sgnbit = wi::set_bit_in_zero (nprec - 1, nprec);
else
- sgnbit = double_int_zero;
+ sgnbit = wi::zero (nprec);
minv = valv & cst2v;
switch (ccode)
{
have folded the comparison into false) and
maximum unsigned value is VAL | ~CST2. */
maxv = valv | ~cst2v;
- maxv = maxv.zext (nprec);
valid_p = true;
break;
+
case NE_EXPR:
tem = valv | ~cst2v;
- tem = tem.zext (nprec);
/* If VAL is 0, handle (X & CST2) != 0 as (X & CST2) > 0U. */
- if (valv.is_zero ())
+ if (valv == 0)
{
cst2n = false;
- sgnbit = double_int_zero;
+ sgnbit = wi::zero (nprec);
goto gt_expr;
}
/* If (VAL | ~CST2) is all ones, handle it as
(X & CST2) < VAL. */
- if (tem == double_int::mask (nprec))
+ if (tem == -1)
{
cst2n = false;
valn = false;
- sgnbit = double_int_zero;
+ sgnbit = wi::zero (nprec);
goto lt_expr;
}
- if (!cst2n
- && cst2v.sext (nprec).is_negative ())
- sgnbit
- = double_int_one.llshift (nprec - 1, nprec).zext (nprec);
- if (!sgnbit.is_zero ())
+ if (!cst2n && wi::neg_p (cst2v))
+ sgnbit = wi::set_bit_in_zero (nprec - 1, nprec);
+ if (sgnbit != 0)
{
if (valv == sgnbit)
{
valn = true;
goto gt_expr;
}
- if (tem == double_int::mask (nprec - 1))
+ if (tem == wi::mask (nprec - 1, false, nprec))
{
cst2n = true;
goto lt_expr;
}
if (!cst2n)
- sgnbit = double_int_zero;
+ sgnbit = wi::zero (nprec);
}
break;
+
case GE_EXPR:
/* Minimum unsigned value for >= if (VAL & CST2) == VAL
is VAL and maximum unsigned value is ~0. For signed
if (minv == valv)
break;
}
- maxv = double_int::mask (nprec - (cst2n ? 1 : 0));
+ maxv = wi::mask (nprec - (cst2n ? 1 : 0), false, nprec);
valid_p = true;
break;
+
case GT_EXPR:
gt_expr:
/* Find out smallest MINV where MINV > VAL
minv = masked_increment (valv, cst2v, sgnbit, nprec);
if (minv == valv)
break;
- maxv = double_int::mask (nprec - (cst2n ? 1 : 0));
+ maxv = wi::mask (nprec - (cst2n ? 1 : 0), false, nprec);
valid_p = true;
break;
+
case LE_EXPR:
/* Minimum unsigned value for <= is 0 and maximum
unsigned value is VAL | ~CST2 if (VAL & CST2) == VAL.
maxv = masked_increment (valv, cst2v, sgnbit, nprec);
if (maxv == valv)
break;
- maxv -= double_int_one;
+ maxv -= 1;
}
maxv |= ~cst2v;
- maxv = maxv.zext (nprec);
minv = sgnbit;
valid_p = true;
break;
+
case LT_EXPR:
lt_expr:
/* Minimum unsigned value for < is 0 and maximum
if (maxv == valv)
break;
}
- maxv -= double_int_one;
+ maxv -= 1;
maxv |= ~cst2v;
- maxv = maxv.zext (nprec);
minv = sgnbit;
valid_p = true;
break;
+
default:
break;
}
if (valid_p
- && (maxv - minv).zext (nprec) != double_int::mask (nprec))
+ && (maxv - minv) != -1)
{
tree tmp, new_val, type;
int i;
for (i = 0; i < 2; i++)
if (names[i])
{
- double_int maxv2 = maxv;
+ wide_int maxv2 = maxv;
tmp = names[i];
type = TREE_TYPE (names[i]);
if (!TYPE_UNSIGNED (type))
type = build_nonstandard_integer_type (nprec, 1);
tmp = build1 (NOP_EXPR, type, names[i]);
}
- if (!minv.is_zero ())
+ if (minv != 0)
{
tmp = build2 (PLUS_EXPR, type, tmp,
- double_int_to_tree (type, -minv));
+ wide_int_to_tree (type, -minv));
maxv2 = maxv - minv;
}
- new_val = double_int_to_tree (type, maxv2);
+ new_val = wide_int_to_tree (type, maxv2);
if (dump_file)
{
register_new_assert_for (names[i], tmp, LE_EXPR,
new_val, NULL, e, bsi);
- retval = true;
}
}
}
}
-
- return retval;
}
/* OP is an operand of a truth value expression which is known to have
If CODE is EQ_EXPR, then we want to register OP is zero (false),
if CODE is NE_EXPR, then we want to register OP is nonzero (true). */
-static bool
+static void
register_edge_assert_for_1 (tree op, enum tree_code code,
edge e, gimple_stmt_iterator bsi)
{
- bool retval = false;
gimple op_def;
tree val;
enum tree_code rhs_code;
/* We only care about SSA_NAMEs. */
if (TREE_CODE (op) != SSA_NAME)
- return false;
+ return;
/* We know that OP will have a zero or nonzero value. If OP is used
- more than once go ahead and register an assert for OP.
-
- The FOUND_IN_SUBGRAPH support is not helpful in this situation as
- it will always be set for OP (because OP is used in a COND_EXPR in
- the subgraph). */
- if (!has_single_use (op))
+ more than once go ahead and register an assert for OP. */
+ if (live_on_edge (e, op)
+ && !has_single_use (op))
{
val = build_int_cst (TREE_TYPE (op), 0);
register_new_assert_for (op, op, code, val, NULL, e, bsi);
- retval = true;
}
/* Now look at how OP is set. If it's set from a comparison,
to register information about the operands of that assignment. */
op_def = SSA_NAME_DEF_STMT (op);
if (gimple_code (op_def) != GIMPLE_ASSIGN)
- return retval;
+ return;
rhs_code = gimple_assign_rhs_code (op_def);
tree op1 = gimple_assign_rhs2 (op_def);
if (TREE_CODE (op0) == SSA_NAME)
- retval |= register_edge_assert_for_2 (op0, e, bsi, rhs_code, op0, op1,
- invert);
+ register_edge_assert_for_2 (op0, e, bsi, rhs_code, op0, op1, invert);
if (TREE_CODE (op1) == SSA_NAME)
- retval |= register_edge_assert_for_2 (op1, e, bsi, rhs_code, op0, op1,
- invert);
+ register_edge_assert_for_2 (op1, e, bsi, rhs_code, op0, op1, invert);
}
else if ((code == NE_EXPR
&& gimple_assign_rhs_code (op_def) == BIT_AND_EXPR)
tree op1 = gimple_assign_rhs2 (op_def);
if (TREE_CODE (op0) == SSA_NAME
&& has_single_use (op0))
- retval |= register_edge_assert_for_1 (op0, code, e, bsi);
+ register_edge_assert_for_1 (op0, code, e, bsi);
if (TREE_CODE (op1) == SSA_NAME
&& has_single_use (op1))
- retval |= register_edge_assert_for_1 (op1, code, e, bsi);
+ register_edge_assert_for_1 (op1, code, e, bsi);
}
else if (gimple_assign_rhs_code (op_def) == BIT_NOT_EXPR
&& TYPE_PRECISION (TREE_TYPE (gimple_assign_lhs (op_def))) == 1)
{
/* Recurse, flipping CODE. */
code = invert_tree_comparison (code, false);
- retval |= register_edge_assert_for_1 (gimple_assign_rhs1 (op_def),
- code, e, bsi);
+ register_edge_assert_for_1 (gimple_assign_rhs1 (op_def), code, e, bsi);
}
else if (gimple_assign_rhs_code (op_def) == SSA_NAME)
{
/* Recurse through the copy. */
- retval |= register_edge_assert_for_1 (gimple_assign_rhs1 (op_def),
- code, e, bsi);
+ register_edge_assert_for_1 (gimple_assign_rhs1 (op_def), code, e, bsi);
}
else if (CONVERT_EXPR_CODE_P (gimple_assign_rhs_code (op_def)))
{
if (INTEGRAL_TYPE_P (TREE_TYPE (rhs))
&& (TYPE_PRECISION (TREE_TYPE (rhs))
<= TYPE_PRECISION (TREE_TYPE (op))))
- retval |= register_edge_assert_for_1 (rhs, code, e, bsi);
+ register_edge_assert_for_1 (rhs, code, e, bsi);
}
-
- return retval;
}
/* Try to register an edge assertion for SSA name NAME on edge E for
- the condition COND contributing to the conditional jump pointed to by SI.
- Return true if an assertion for NAME could be registered. */
+ the condition COND contributing to the conditional jump pointed to by
+ SI. */
-static bool
+static void
register_edge_assert_for (tree name, edge e, gimple_stmt_iterator si,
enum tree_code cond_code, tree cond_op0,
tree cond_op1)
{
tree val;
enum tree_code comp_code;
- bool retval = false;
bool is_else_edge = (e->flags & EDGE_FALSE_VALUE) != 0;
/* Do not attempt to infer anything in names that flow through
abnormal edges. */
if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (name))
- return false;
+ return;
if (!extract_code_and_val_from_cond_with_ops (name, cond_code,
cond_op0, cond_op1,
is_else_edge,
&comp_code, &val))
- return false;
+ return;
/* Register ASSERT_EXPRs for name. */
- retval |= register_edge_assert_for_2 (name, e, si, cond_code, cond_op0,
- cond_op1, is_else_edge);
+ register_edge_assert_for_2 (name, e, si, cond_code, cond_op0,
+ cond_op1, is_else_edge);
/* If COND is effectively an equality test of an SSA_NAME against
{
tree op0 = gimple_assign_rhs1 (def_stmt);
tree op1 = gimple_assign_rhs2 (def_stmt);
- retval |= register_edge_assert_for_1 (op0, NE_EXPR, e, si);
- retval |= register_edge_assert_for_1 (op1, NE_EXPR, e, si);
+ register_edge_assert_for_1 (op0, NE_EXPR, e, si);
+ register_edge_assert_for_1 (op1, NE_EXPR, e, si);
}
}
{
tree op0 = gimple_assign_rhs1 (def_stmt);
tree op1 = gimple_assign_rhs2 (def_stmt);
- retval |= register_edge_assert_for_1 (op0, EQ_EXPR, e, si);
- retval |= register_edge_assert_for_1 (op1, EQ_EXPR, e, si);
+ register_edge_assert_for_1 (op0, EQ_EXPR, e, si);
+ register_edge_assert_for_1 (op1, EQ_EXPR, e, si);
}
}
-
- return retval;
}
the predicate operands, an assert location node is added to the
list of assertions for the corresponding operands. */
-static bool
-find_conditional_asserts (basic_block bb, gimple last)
+static void
+find_conditional_asserts (basic_block bb, gcond *last)
{
- bool need_assert;
gimple_stmt_iterator bsi;
tree op;
edge_iterator ei;
edge e;
ssa_op_iter iter;
- need_assert = false;
bsi = gsi_for_stmt (last);
/* Look for uses of the operands in each of the sub-graphs
/* Register the necessary assertions for each operand in the
conditional predicate. */
FOR_EACH_SSA_TREE_OPERAND (op, last, iter, SSA_OP_USE)
- {
- need_assert |= register_edge_assert_for (op, e, bsi,
- gimple_cond_code (last),
- gimple_cond_lhs (last),
- gimple_cond_rhs (last));
- }
+ register_edge_assert_for (op, e, bsi,
+ gimple_cond_code (last),
+ gimple_cond_lhs (last),
+ gimple_cond_rhs (last));
}
-
- return need_assert;
}
struct case_info
the predicate operands, an assert location node is added to the
list of assertions for the corresponding operands. */
-static bool
-find_switch_asserts (basic_block bb, gimple last)
+static void
+find_switch_asserts (basic_block bb, gswitch *last)
{
- bool need_assert;
gimple_stmt_iterator bsi;
tree op;
edge e;
volatile unsigned int idx;
#endif
- need_assert = false;
bsi = gsi_for_stmt (last);
op = gimple_switch_index (last);
if (TREE_CODE (op) != SSA_NAME)
- return false;
+ return;
/* Build a vector of case labels sorted by destination label. */
ci = XNEWVEC (struct case_info, n);
/* Register the necessary assertions for the operand in the
SWITCH_EXPR. */
- need_assert |= register_edge_assert_for (op, e, bsi,
- max ? GE_EXPR : EQ_EXPR,
- op,
- fold_convert (TREE_TYPE (op),
- min));
+ register_edge_assert_for (op, e, bsi,
+ max ? GE_EXPR : EQ_EXPR,
+ op, fold_convert (TREE_TYPE (op), min));
if (max)
- {
- need_assert |= register_edge_assert_for (op, e, bsi, LE_EXPR,
- op,
- fold_convert (TREE_TYPE (op),
- max));
- }
+ register_edge_assert_for (op, e, bsi, LE_EXPR, op,
+ fold_convert (TREE_TYPE (op), max));
}
XDELETEVEC (ci);
- return need_assert;
}
registered assertions to prevent adding unnecessary assertions.
For instance, if a pointer P_4 is dereferenced more than once in a
dominator tree, only the location dominating all the dereference of
- P_4 will receive an ASSERT_EXPR.
-
- If this function returns true, then it means that there are names
- for which we need to generate ASSERT_EXPRs. Those assertions are
- inserted by process_assert_insertions. */
+ P_4 will receive an ASSERT_EXPR. */
-static bool
+static void
find_assert_locations_1 (basic_block bb, sbitmap live)
{
- gimple_stmt_iterator si;
gimple last;
- bool need_assert;
- need_assert = false;
last = last_stmt (bb);
/* If BB's last statement is a conditional statement involving integer
&& gimple_code (last) == GIMPLE_COND
&& !fp_predicate (last)
&& !ZERO_SSA_OPERANDS (last, SSA_OP_USE))
- need_assert |= find_conditional_asserts (bb, last);
+ find_conditional_asserts (bb, as_a <gcond *> (last));
/* If BB's last statement is a switch statement involving integer
operands, determine if we need to add ASSERT_EXPRs. */
if (last
&& gimple_code (last) == GIMPLE_SWITCH
&& !ZERO_SSA_OPERANDS (last, SSA_OP_USE))
- need_assert |= find_switch_asserts (bb, last);
+ find_switch_asserts (bb, as_a <gswitch *> (last));
/* Traverse all the statements in BB marking used names and looking
for statements that may infer assertions for their used operands. */
- for (si = gsi_last_bb (bb); !gsi_end_p (si); gsi_prev (&si))
+ for (gimple_stmt_iterator si = gsi_last_bb (bb); !gsi_end_p (si);
+ gsi_prev (&si))
{
gimple stmt;
tree op;
gimple def_stmt = SSA_NAME_DEF_STMT (t);
while (is_gimple_assign (def_stmt)
- && gimple_assign_rhs_code (def_stmt) == NOP_EXPR
+ && CONVERT_EXPR_CODE_P
+ (gimple_assign_rhs_code (def_stmt))
&& TREE_CODE
(gimple_assign_rhs1 (def_stmt)) == SSA_NAME
&& POINTER_TYPE_P
operand of the NOP_EXPR after SI, not after the
conversion. */
if (! has_single_use (t))
- {
- register_new_assert_for (t, t, comp_code, value,
- bb, NULL, si);
- need_assert = true;
- }
+ register_new_assert_for (t, t, comp_code, value,
+ bb, NULL, si);
}
}
register_new_assert_for (op, op, comp_code, value, bb, NULL, si);
- need_assert = true;
}
}
}
/* Traverse all PHI nodes in BB, updating live. */
- for (si = gsi_start_phis (bb); !gsi_end_p (si); gsi_next (&si))
+ for (gphi_iterator si = gsi_start_phis (bb); !gsi_end_p (si);
+ gsi_next (&si))
{
use_operand_p arg_p;
ssa_op_iter i;
- gimple phi = gsi_stmt (si);
+ gphi *phi = si.phi ();
tree res = gimple_phi_result (phi);
if (virtual_operand_p (res))
bitmap_clear_bit (live, SSA_NAME_VERSION (res));
}
-
- return need_assert;
}
/* Do an RPO walk over the function computing SSA name liveness
- on-the-fly and deciding on assert expressions to insert.
- Returns true if there are assert expressions to be inserted. */
+ on-the-fly and deciding on assert expressions to insert. */
-static bool
+static void
find_assert_locations (void)
{
- int *rpo = XNEWVEC (int, last_basic_block);
- int *bb_rpo = XNEWVEC (int, last_basic_block);
- int *last_rpo = XCNEWVEC (int, last_basic_block);
+ int *rpo = XNEWVEC (int, last_basic_block_for_fn (cfun));
+ int *bb_rpo = XNEWVEC (int, last_basic_block_for_fn (cfun));
+ int *last_rpo = XCNEWVEC (int, last_basic_block_for_fn (cfun));
int rpo_cnt, i;
- bool need_asserts;
- live = XCNEWVEC (sbitmap, last_basic_block);
+ live = XCNEWVEC (sbitmap, last_basic_block_for_fn (cfun));
rpo_cnt = pre_and_rev_post_order_compute (NULL, rpo, false);
for (i = 0; i < rpo_cnt; ++i)
bb_rpo[rpo[i]] = i;
{
i = loop->latch->index;
unsigned int j = single_succ_edge (loop->latch)->dest_idx;
- for (gimple_stmt_iterator gsi = gsi_start_phis (loop->header);
+ for (gphi_iterator gsi = gsi_start_phis (loop->header);
!gsi_end_p (gsi); gsi_next (&gsi))
{
- gimple phi = gsi_stmt (gsi);
+ gphi *phi = gsi.phi ();
if (virtual_operand_p (gimple_phi_result (phi)))
continue;
tree arg = gimple_phi_arg_def (phi, j);
}
}
- need_asserts = false;
for (i = rpo_cnt - 1; i >= 0; --i)
{
- basic_block bb = BASIC_BLOCK (rpo[i]);
+ basic_block bb = BASIC_BLOCK_FOR_FN (cfun, rpo[i]);
edge e;
edge_iterator ei;
/* Process BB and update the live information with uses in
this block. */
- need_asserts |= find_assert_locations_1 (bb, live[rpo[i]]);
+ find_assert_locations_1 (bb, live[rpo[i]]);
/* Merge liveness into the predecessor blocks and free it. */
if (!bitmap_empty_p (live[rpo[i]]))
XDELETEVEC (rpo);
XDELETEVEC (bb_rpo);
XDELETEVEC (last_rpo);
- for (i = 0; i < last_basic_block; ++i)
+ for (i = 0; i < last_basic_block_for_fn (cfun); ++i)
if (live[i])
sbitmap_free (live[i]);
XDELETEVEC (live);
-
- return need_asserts;
}
/* Create an ASSERT_EXPR for NAME and insert it in the location
}
else
{
- y = ASSERT_EXPR <y, x <= y>
+ y = ASSERT_EXPR <y, x >= y>
x = y + 3
}
calculate_dominance_info (CDI_DOMINATORS);
- if (find_assert_locations ())
+ find_assert_locations ();
+ if (!bitmap_empty_p (need_assert_for))
{
process_assert_insertions ();
update_ssa (TODO_update_ssa_no_phi);
/* Accesses to trailing arrays via pointers may access storage
beyond the types array bounds. */
base = get_base_address (ref);
- if (base && TREE_CODE (base) == MEM_REF)
+ if ((warn_array_bounds < 2)
+ && base && TREE_CODE (base) == MEM_REF)
{
tree cref, next = NULL_TREE;
}
low_bound = array_ref_low_bound (ref);
- up_bound_p1 = int_const_binop (PLUS_EXPR, up_bound, integer_one_node);
+ up_bound_p1 = int_const_binop (PLUS_EXPR, up_bound,
+ build_int_cst (TREE_TYPE (up_bound), 1));
+
+ /* Empty array. */
+ if (tree_int_cst_equal (low_bound, up_bound_p1))
+ {
+ warning_at (location, OPT_Warray_bounds,
+ "array subscript is above array bounds");
+ TREE_NO_WARNING (ref) = 1;
+ }
if (TREE_CODE (low_sub) == SSA_NAME)
{
if (vr && vr->type == VR_ANTI_RANGE)
{
if (TREE_CODE (up_sub) == INTEGER_CST
- && tree_int_cst_lt (up_bound, up_sub)
+ && (ignore_off_by_one
+ ? tree_int_cst_lt (up_bound, up_sub)
+ : tree_int_cst_le (up_bound, up_sub))
&& TREE_CODE (low_sub) == INTEGER_CST
- && tree_int_cst_lt (low_sub, low_bound))
+ && tree_int_cst_le (low_sub, low_bound))
{
warning_at (location, OPT_Warray_bounds,
"array subscript is outside array bounds");
}
else if (TREE_CODE (up_sub) == INTEGER_CST
&& (ignore_off_by_one
- ? (tree_int_cst_lt (up_bound, up_sub)
- && !tree_int_cst_equal (up_bound_p1, up_sub))
- : (tree_int_cst_lt (up_bound, up_sub)
- || tree_int_cst_equal (up_bound_p1, up_sub))))
+ ? !tree_int_cst_le (up_sub, up_bound_p1)
+ : !tree_int_cst_le (up_sub, up_bound)))
{
if (dump_file && (dump_flags & TDF_DETAILS))
{
static void
search_for_addr_array (tree t, location_t location)
{
- while (TREE_CODE (t) == SSA_NAME)
- {
- gimple g = SSA_NAME_DEF_STMT (t);
-
- if (gimple_code (g) != GIMPLE_ASSIGN)
- return;
-
- if (get_gimple_rhs_class (gimple_assign_rhs_code (g))
- != GIMPLE_SINGLE_RHS)
- return;
-
- t = gimple_assign_rhs1 (g);
- }
-
-
- /* We are only interested in addresses of ARRAY_REF's. */
- if (TREE_CODE (t) != ADDR_EXPR)
- return;
-
/* Check each ARRAY_REFs in the reference chain. */
do
{
{
tree tem = TREE_OPERAND (TREE_OPERAND (t, 0), 0);
tree low_bound, up_bound, el_sz;
- double_int idx;
+ offset_int idx;
if (TREE_CODE (TREE_TYPE (tem)) != ARRAY_TYPE
|| TREE_CODE (TREE_TYPE (TREE_TYPE (tem))) == ARRAY_TYPE
|| !TYPE_DOMAIN (TREE_TYPE (tem)))
return;
idx = mem_ref_offset (t);
- idx = idx.sdiv (tree_to_double_int (el_sz), TRUNC_DIV_EXPR);
- if (idx.slt (double_int_zero))
+ idx = wi::sdiv_trunc (idx, wi::to_offset (el_sz));
+ if (wi::lts_p (idx, 0))
{
if (dump_file && (dump_flags & TDF_DETAILS))
{
"array subscript is below array bounds");
TREE_NO_WARNING (t) = 1;
}
- else if (idx.sgt (tree_to_double_int (up_bound)
- - tree_to_double_int (low_bound)
- + double_int_one))
+ else if (wi::gts_p (idx, (wi::to_offset (up_bound)
+ - wi::to_offset (low_bound) + 1)))
{
if (dump_file && (dump_flags & TDF_DETAILS))
{
if (TREE_CODE (t) == ARRAY_REF)
check_array_ref (location, t, false /*ignore_off_by_one*/);
- if (TREE_CODE (t) == MEM_REF
- || (TREE_CODE (t) == RETURN_EXPR && TREE_OPERAND (t, 0)))
- search_for_addr_array (TREE_OPERAND (t, 0), location);
-
- if (TREE_CODE (t) == ADDR_EXPR)
- *walk_subtree = FALSE;
+ else if (TREE_CODE (t) == ADDR_EXPR)
+ {
+ search_for_addr_array (t, location);
+ *walk_subtree = FALSE;
+ }
return NULL_TREE;
}
basic_block bb;
gimple_stmt_iterator si;
- FOR_EACH_BB (bb)
+ FOR_EACH_BB_FN (bb, cfun)
{
edge_iterator ei;
edge e;
{
gimple stmt = gsi_stmt (si);
struct walk_stmt_info wi;
- if (!gimple_has_location (stmt))
+ if (!gimple_has_location (stmt)
+ || is_gimple_debug (stmt))
continue;
- if (is_gimple_call (stmt))
- {
- size_t i;
- size_t n = gimple_call_num_args (stmt);
- for (i = 0; i < n; i++)
- {
- tree arg = gimple_call_arg (stmt, i);
- search_for_addr_array (arg, gimple_location (stmt));
- }
- }
- else
- {
- memset (&wi, 0, sizeof (wi));
- wi.info = CONST_CAST (void *, (const void *)
- gimple_location_ptr (stmt));
+ memset (&wi, 0, sizeof (wi));
+ wi.info = CONST_CAST (void *, (const void *)
+ gimple_location_ptr (stmt));
- walk_gimple_op (gsi_stmt (si),
- check_array_bounds,
- &wi);
- }
+ walk_gimple_op (gsi_stmt (si),
+ check_array_bounds,
+ &wi);
}
}
}
return;
}
cst = gimple_assign_rhs2 (stmt);
- set_nonzero_bits (var, (get_nonzero_bits (var)
- & ~tree_to_double_int (cst)));
+ set_nonzero_bits (var, wi::bit_and_not (get_nonzero_bits (var), cst));
}
/* Convert range assertion expressions into the implied copies and
/* Note that the BSI iterator bump happens at the bottom of the
loop and no bump is necessary if we're removing the statement
referenced by the current BSI. */
- FOR_EACH_BB (bb)
+ FOR_EACH_BB_FN (bb, cfun)
for (si = gsi_after_labels (bb), is_unreachable = -1; !gsi_end_p (si);)
{
gimple stmt = gsi_stmt (si);
single_pred (bb)))
{
set_range_info (var, SSA_NAME_RANGE_TYPE (lhs),
- SSA_NAME_RANGE_INFO (lhs)->min,
- SSA_NAME_RANGE_INFO (lhs)->max);
+ SSA_NAME_RANGE_INFO (lhs)->get_min (),
+ SSA_NAME_RANGE_INFO (lhs)->get_max ());
maybe_set_nonzero_bits (bb, var);
}
}
}
else
{
+ if (!is_gimple_debug (gsi_stmt (si)))
+ is_unreachable = 0;
gsi_next (&si);
- is_unreachable = 0;
}
}
}
&& (is_gimple_call (stmt)
|| !gimple_vuse (stmt)))
return true;
+ else if (is_gimple_call (stmt) && gimple_call_internal_p (stmt))
+ switch (gimple_call_internal_fn (stmt))
+ {
+ case IFN_ADD_OVERFLOW:
+ case IFN_SUB_OVERFLOW:
+ case IFN_MUL_OVERFLOW:
+ /* These internal calls return _Complex integer type,
+ but are interesting to VRP nevertheless. */
+ if (lhs && TREE_CODE (lhs) == SSA_NAME)
+ return true;
+ break;
+ default:
+ break;
+ }
}
else if (gimple_code (stmt) == GIMPLE_COND
|| gimple_code (stmt) == GIMPLE_SWITCH)
vr_value = XCNEWVEC (value_range_t *, num_vr_values);
vr_phi_edge_counts = XCNEWVEC (int, num_ssa_names);
- FOR_EACH_BB (bb)
+ FOR_EACH_BB_FN (bb, cfun)
{
- gimple_stmt_iterator si;
-
- for (si = gsi_start_phis (bb); !gsi_end_p (si); gsi_next (&si))
+ for (gphi_iterator si = gsi_start_phis (bb); !gsi_end_p (si);
+ gsi_next (&si))
{
- gimple phi = gsi_stmt (si);
+ gphi *phi = si.phi ();
if (!stmt_interesting_for_vrp (phi))
{
tree lhs = PHI_RESULT (phi);
prop_set_simulate_again (phi, true);
}
- for (si = gsi_start_bb (bb); !gsi_end_p (si); gsi_next (&si))
+ for (gimple_stmt_iterator si = gsi_start_bb (bb); !gsi_end_p (si);
+ gsi_next (&si))
{
gimple stmt = gsi_stmt (si);
return name;
}
+/* Return the singleton value-range for NAME if that is a constant
+ but signal to not follow SSA edges. */
+
+static inline tree
+vrp_valueize_1 (tree name)
+{
+ if (TREE_CODE (name) == SSA_NAME)
+ {
+ /* If the definition may be simulated again we cannot follow
+ this SSA edge as the SSA propagator does not necessarily
+ re-visit the use. */
+ gimple def_stmt = SSA_NAME_DEF_STMT (name);
+ if (!gimple_nop_p (def_stmt)
+ && prop_simulate_again_p (def_stmt))
+ return NULL_TREE;
+ value_range_t *vr = get_value_range (name);
+ if (range_int_cst_singleton_p (vr))
+ return vr->min;
+ }
+ return name;
+}
+
/* Visit assignment STMT. If it produces an interesting range, record
the SSA name in *OUTPUT_P. */
value_range_t new_vr = VR_INITIALIZER;
/* Try folding the statement to a constant first. */
- tree tem = gimple_fold_stmt_to_constant (stmt, vrp_valueize);
- if (tem)
+ tree tem = gimple_fold_stmt_to_constant_1 (stmt, vrp_valueize,
+ vrp_valueize_1);
+ if (tem && is_gimple_min_invariant (tem))
set_value_range_to_value (&new_vr, tem, NULL);
/* Then dispatch to value-range extracting functions. */
else if (code == GIMPLE_CALL)
extract_range_basic (&new_vr, stmt);
else
- extract_range_from_assignment (&new_vr, stmt);
+ extract_range_from_assignment (&new_vr, as_a <gassign *> (stmt));
if (update_value_range (lhs, &new_vr))
{
print_generic_expr (dump_file, lhs, 0);
fprintf (dump_file, ": ");
dump_value_range (dump_file, &new_vr);
- fprintf (dump_file, "\n\n");
+ fprintf (dump_file, "\n");
}
if (new_vr.type == VR_VARYING)
return SSA_PROP_NOT_INTERESTING;
}
+ else if (is_gimple_call (stmt) && gimple_call_internal_p (stmt))
+ switch (gimple_call_internal_fn (stmt))
+ {
+ case IFN_ADD_OVERFLOW:
+ case IFN_SUB_OVERFLOW:
+ case IFN_MUL_OVERFLOW:
+ /* These internal calls return _Complex integer type,
+ which VRP does not track, but the immediate uses
+ thereof might be interesting. */
+ if (lhs && TREE_CODE (lhs) == SSA_NAME)
+ {
+ imm_use_iterator iter;
+ use_operand_p use_p;
+ enum ssa_prop_result res = SSA_PROP_VARYING;
+
+ set_value_range_to_varying (get_value_range (lhs));
+
+ FOR_EACH_IMM_USE_FAST (use_p, iter, lhs)
+ {
+ gimple use_stmt = USE_STMT (use_p);
+ if (!is_gimple_assign (use_stmt))
+ continue;
+ enum tree_code rhs_code = gimple_assign_rhs_code (use_stmt);
+ if (rhs_code != REALPART_EXPR && rhs_code != IMAGPART_EXPR)
+ continue;
+ tree rhs1 = gimple_assign_rhs1 (use_stmt);
+ tree use_lhs = gimple_assign_lhs (use_stmt);
+ if (TREE_CODE (rhs1) != rhs_code
+ || TREE_OPERAND (rhs1, 0) != lhs
+ || TREE_CODE (use_lhs) != SSA_NAME
+ || !stmt_interesting_for_vrp (use_stmt)
+ || (!INTEGRAL_TYPE_P (TREE_TYPE (use_lhs))
+ || !TYPE_MIN_VALUE (TREE_TYPE (use_lhs))
+ || !TYPE_MAX_VALUE (TREE_TYPE (use_lhs))))
+ continue;
+
+ /* If there is a change in the value range for any of the
+ REALPART_EXPR/IMAGPART_EXPR immediate uses, return
+ SSA_PROP_INTERESTING. If there are any REALPART_EXPR
+ or IMAGPART_EXPR immediate uses, but none of them have
+ a change in their value ranges, return
+ SSA_PROP_NOT_INTERESTING. If there are no
+ {REAL,IMAG}PART_EXPR uses at all,
+ return SSA_PROP_VARYING. */
+ value_range_t new_vr = VR_INITIALIZER;
+ extract_range_basic (&new_vr, use_stmt);
+ value_range_t *old_vr = get_value_range (use_lhs);
+ if (old_vr->type != new_vr.type
+ || !vrp_operand_equal_p (old_vr->min, new_vr.min)
+ || !vrp_operand_equal_p (old_vr->max, new_vr.max)
+ || !vrp_bitmap_equal_p (old_vr->equiv, new_vr.equiv))
+ res = SSA_PROP_INTERESTING;
+ else
+ res = SSA_PROP_NOT_INTERESTING;
+ BITMAP_FREE (new_vr.equiv);
+ if (res == SSA_PROP_INTERESTING)
+ {
+ *output_p = lhs;
+ return res;
+ }
+ }
+
+ return res;
+ }
+ break;
+ default:
+ break;
+ }
/* Every other statement produces no useful ranges. */
FOR_EACH_SSA_TREE_OPERAND (def, stmt, iter, SSA_OP_DEF)
vr0 = (TREE_CODE (op0) == SSA_NAME) ? get_value_range (op0) : NULL;
vr1 = (TREE_CODE (op1) == SSA_NAME) ? get_value_range (op1) : NULL;
+ tree res = NULL_TREE;
if (vr0 && vr1)
- return compare_ranges (code, vr0, vr1, strict_overflow_p);
- else if (vr0 && vr1 == NULL)
- return compare_range_with_value (code, vr0, op1, strict_overflow_p);
- else if (vr0 == NULL && vr1)
- return (compare_range_with_value
+ res = compare_ranges (code, vr0, vr1, strict_overflow_p);
+ if (!res && vr0)
+ res = compare_range_with_value (code, vr0, op1, strict_overflow_p);
+ if (!res && vr1)
+ res = (compare_range_with_value
(swap_tree_comparison (code), vr1, op0, strict_overflow_p));
- return NULL;
+ return res;
}
/* Helper function for vrp_evaluate_conditional_warnv. */
tree type = TREE_TYPE (op0);
value_range_t *vr0 = get_value_range (op0);
- if (vr0->type != VR_VARYING
+ if (vr0->type == VR_RANGE
&& INTEGRAL_TYPE_P (type)
&& vrp_val_is_min (vr0->min)
&& vrp_val_is_max (vr0->max)
SSA_PROP_VARYING. */
static enum ssa_prop_result
-vrp_visit_cond_stmt (gimple stmt, edge *taken_edge_p)
+vrp_visit_cond_stmt (gcond *stmt, edge *taken_edge_p)
{
tree val;
bool sop;
returned. */
static bool
-find_case_label_index (gimple stmt, size_t start_idx, tree val, size_t *idx)
+find_case_label_index (gswitch *stmt, size_t start_idx, tree val, size_t *idx)
{
size_t n = gimple_switch_num_labels (stmt);
size_t low, high;
Returns true if the default label is not needed. */
static bool
-find_case_label_range (gimple stmt, tree min, tree max, size_t *min_idx,
+find_case_label_range (gswitch *stmt, tree min, tree max, size_t *min_idx,
size_t *max_idx)
{
size_t i, j;
Returns true if the default label is not needed. */
static bool
-find_case_label_ranges (gimple stmt, value_range_t *vr, size_t *min_idx1,
+find_case_label_ranges (gswitch *stmt, value_range_t *vr, size_t *min_idx1,
size_t *max_idx1, size_t *min_idx2,
size_t *max_idx2)
{
SSA_PROP_VARYING. */
static enum ssa_prop_result
-vrp_visit_switch_stmt (gimple stmt, edge *taken_edge_p)
+vrp_visit_switch_stmt (gswitch *stmt, edge *taken_edge_p)
{
tree op, val;
value_range_t *vr;
{
fprintf (dump_file, "\nVisiting statement:\n");
print_gimple_stmt (dump_file, stmt, 0, dump_flags);
- fprintf (dump_file, "\n");
}
if (!stmt_interesting_for_vrp (stmt))
else if (is_gimple_assign (stmt) || is_gimple_call (stmt))
return vrp_visit_assignment_or_call (stmt, output_p);
else if (gimple_code (stmt) == GIMPLE_COND)
- return vrp_visit_cond_stmt (stmt, taken_edge_p);
+ return vrp_visit_cond_stmt (as_a <gcond *> (stmt), taken_edge_p);
else if (gimple_code (stmt) == GIMPLE_SWITCH)
- return vrp_visit_switch_stmt (stmt, taken_edge_p);
+ return vrp_visit_switch_stmt (as_a <gswitch *> (stmt), taken_edge_p);
/* All other statements produce nothing of interest for VRP, so mark
their outputs varying and prevent further simulation. */
&& vrp_val_is_max (vr1max))
{
tree min = int_const_binop (PLUS_EXPR,
- *vr0max, integer_one_node);
+ *vr0max,
+ build_int_cst (TREE_TYPE (*vr0max), 1));
tree max = int_const_binop (MINUS_EXPR,
- vr1min, integer_one_node);
+ vr1min,
+ build_int_cst (TREE_TYPE (vr1min), 1));
if (!operand_less_p (max, min))
{
*vr0type = VR_ANTI_RANGE;
&& vrp_val_is_max (*vr0max))
{
tree min = int_const_binop (PLUS_EXPR,
- vr1max, integer_one_node);
+ vr1max,
+ build_int_cst (TREE_TYPE (vr1max), 1));
tree max = int_const_binop (MINUS_EXPR,
- *vr0min, integer_one_node);
+ *vr0min,
+ build_int_cst (TREE_TYPE (*vr0min), 1));
if (!operand_less_p (max, min))
{
*vr0type = VR_ANTI_RANGE;
{
/* Arbitrarily choose the right or left gap. */
if (!mineq && TREE_CODE (vr1min) == INTEGER_CST)
- *vr0max = int_const_binop (MINUS_EXPR, vr1min, integer_one_node);
+ *vr0max = int_const_binop (MINUS_EXPR, vr1min,
+ build_int_cst (TREE_TYPE (vr1min), 1));
else if (!maxeq && TREE_CODE (vr1max) == INTEGER_CST)
- *vr0min = int_const_binop (PLUS_EXPR, vr1max, integer_one_node);
+ *vr0min = int_const_binop (PLUS_EXPR, vr1max,
+ build_int_cst (TREE_TYPE (vr1max), 1));
else
goto give_up;
}
*vr0type = VR_ANTI_RANGE;
if (!mineq && TREE_CODE (*vr0min) == INTEGER_CST)
{
- *vr0max = int_const_binop (MINUS_EXPR, *vr0min, integer_one_node);
+ *vr0max = int_const_binop (MINUS_EXPR, *vr0min,
+ build_int_cst (TREE_TYPE (*vr0min), 1));
*vr0min = vr1min;
}
else if (!maxeq && TREE_CODE (*vr0max) == INTEGER_CST)
{
- *vr0min = int_const_binop (PLUS_EXPR, *vr0max, integer_one_node);
+ *vr0min = int_const_binop (PLUS_EXPR, *vr0max,
+ build_int_cst (TREE_TYPE (*vr0max), 1));
*vr0max = vr1max;
}
else
}
else if ((operand_less_p (vr1min, *vr0max) == 1
|| operand_equal_p (vr1min, *vr0max, 0))
- && operand_less_p (*vr0min, vr1min) == 1)
+ && operand_less_p (*vr0min, vr1min) == 1
+ && operand_less_p (*vr0max, vr1max) == 1)
{
/* [ ( ] ) or [ ]( ) */
if (*vr0type == VR_RANGE
&& vr1type == VR_RANGE)
{
if (TREE_CODE (vr1min) == INTEGER_CST)
- *vr0max = int_const_binop (MINUS_EXPR, vr1min, integer_one_node);
+ *vr0max = int_const_binop (MINUS_EXPR, vr1min,
+ build_int_cst (TREE_TYPE (vr1min), 1));
else
goto give_up;
}
if (TREE_CODE (*vr0max) == INTEGER_CST)
{
*vr0type = vr1type;
- *vr0min = int_const_binop (PLUS_EXPR, *vr0max, integer_one_node);
+ *vr0min = int_const_binop (PLUS_EXPR, *vr0max,
+ build_int_cst (TREE_TYPE (*vr0max), 1));
*vr0max = vr1max;
}
else
}
else if ((operand_less_p (*vr0min, vr1max) == 1
|| operand_equal_p (*vr0min, vr1max, 0))
- && operand_less_p (vr1min, *vr0min) == 1)
+ && operand_less_p (vr1min, *vr0min) == 1
+ && operand_less_p (vr1max, *vr0max) == 1)
{
/* ( [ ) ] or ( )[ ] */
if (*vr0type == VR_RANGE
&& vr1type == VR_RANGE)
{
if (TREE_CODE (vr1max) == INTEGER_CST)
- *vr0min = int_const_binop (PLUS_EXPR, vr1max, integer_one_node);
+ *vr0min = int_const_binop (PLUS_EXPR, vr1max,
+ build_int_cst (TREE_TYPE (vr1max), 1));
else
goto give_up;
}
{
*vr0type = vr1type;
*vr0min = vr1min;
- *vr0max = int_const_binop (MINUS_EXPR, *vr0min, integer_one_node);
+ *vr0max = int_const_binop (MINUS_EXPR, *vr0min,
+ build_int_cst (TREE_TYPE (*vr0min), 1));
}
else
goto give_up;
if (mineq)
{
if (TREE_CODE (vr1max) == INTEGER_CST)
- *vr0min = int_const_binop (PLUS_EXPR, vr1max, integer_one_node);
+ *vr0min = int_const_binop (PLUS_EXPR, vr1max,
+ build_int_cst (TREE_TYPE (vr1max), 1));
else
*vr0min = vr1max;
}
{
if (TREE_CODE (vr1min) == INTEGER_CST)
*vr0max = int_const_binop (MINUS_EXPR, vr1min,
- integer_one_node);
+ build_int_cst (TREE_TYPE (vr1min), 1));
else
*vr0max = vr1min;
}
*vr0type = VR_RANGE;
if (TREE_CODE (*vr0max) == INTEGER_CST)
*vr0min = int_const_binop (PLUS_EXPR, *vr0max,
- integer_one_node);
+ build_int_cst (TREE_TYPE (*vr0max), 1));
else
*vr0min = *vr0max;
*vr0max = vr1max;
*vr0type = VR_RANGE;
if (TREE_CODE (*vr0min) == INTEGER_CST)
*vr0max = int_const_binop (MINUS_EXPR, *vr0min,
- integer_one_node);
+ build_int_cst (TREE_TYPE (*vr0min), 1));
else
*vr0max = *vr0min;
*vr0min = vr1min;
{
if (TREE_CODE (vr1min) == INTEGER_CST)
*vr0max = int_const_binop (MINUS_EXPR, vr1min,
- integer_one_node);
+ build_int_cst (TREE_TYPE (vr1min), 1));
else
*vr0max = vr1min;
}
*vr0type = VR_RANGE;
if (TREE_CODE (*vr0max) == INTEGER_CST)
*vr0min = int_const_binop (PLUS_EXPR, *vr0max,
- integer_one_node);
+ build_int_cst (TREE_TYPE (*vr0max), 1));
else
*vr0min = *vr0max;
*vr0max = vr1max;
{
if (TREE_CODE (vr1max) == INTEGER_CST)
*vr0min = int_const_binop (PLUS_EXPR, vr1max,
- integer_one_node);
+ build_int_cst (TREE_TYPE (vr1max), 1));
else
*vr0min = vr1max;
}
*vr0type = VR_RANGE;
if (TREE_CODE (*vr0min) == INTEGER_CST)
*vr0max = int_const_binop (MINUS_EXPR, *vr0min,
- integer_one_node);
+ build_int_cst (TREE_TYPE (*vr0min), 1));
else
*vr0max = *vr0min;
*vr0min = vr1min;
value ranges, set a new range for the LHS of PHI. */
static enum ssa_prop_result
-vrp_visit_phi_node (gimple phi)
+vrp_visit_phi_node (gphi *phi)
{
size_t i;
tree lhs = PHI_RESULT (phi);
if (dump_file && (dump_flags & TDF_DETAILS))
{
fprintf (dump_file,
- "\n Argument #%d (%d -> %d %sexecutable)\n",
+ " Argument #%d (%d -> %d %sexecutable)\n",
(int) i, e->src->index, e->dest->index,
(e->flags & EDGE_EXECUTABLE) ? "" : "not ");
}
/* Do not allow equivalences or symbolic ranges to leak in from
backedges. That creates invalid equivalencies.
See PR53465 and PR54767. */
- if (e->flags & EDGE_DFS_BACK
- && (vr_arg.type == VR_RANGE
- || vr_arg.type == VR_ANTI_RANGE))
+ if (e->flags & EDGE_DFS_BACK)
{
- vr_arg.equiv = NULL;
- if (symbolic_range_p (&vr_arg))
+ if (vr_arg.type == VR_RANGE
+ || vr_arg.type == VR_ANTI_RANGE)
{
- vr_arg.type = VR_VARYING;
- vr_arg.min = NULL_TREE;
- vr_arg.max = NULL_TREE;
+ vr_arg.equiv = NULL;
+ if (symbolic_range_p (&vr_arg))
+ {
+ vr_arg.type = VR_VARYING;
+ vr_arg.min = NULL_TREE;
+ vr_arg.max = NULL_TREE;
+ }
+ }
+ }
+ else
+ {
+ /* If the non-backedge arguments range is VR_VARYING then
+ we can still try recording a simple equivalence. */
+ if (vr_arg.type == VR_VARYING)
+ {
+ vr_arg.type = VR_RANGE;
+ vr_arg.min = arg;
+ vr_arg.max = arg;
+ vr_arg.equiv = NULL;
}
}
}
{
fprintf (dump_file, "\t");
print_generic_expr (dump_file, arg, dump_flags);
- fprintf (dump_file, "\n\tValue: ");
+ fprintf (dump_file, ": ");
dump_value_range (dump_file, &vr_arg);
fprintf (dump_file, "\n");
}
&& edges == old_edges
&& lhs_vr->type != VR_UNDEFINED)
{
+ /* Compare old and new ranges, fall back to varying if the
+ values are not comparable. */
int cmp_min = compare_values (lhs_vr->min, vr_result.min);
+ if (cmp_min == -2)
+ goto varying;
int cmp_max = compare_values (lhs_vr->max, vr_result.max);
+ if (cmp_max == -2)
+ goto varying;
/* For non VR_RANGE or for pointers fall back to varying if
the range changed. */
&& (cmp_min != 0 || cmp_max != 0))
goto varying;
- /* If the new minimum is smaller or larger than the previous
- one, go all the way to -INF. In the first case, to avoid
- iterating millions of times to reach -INF, and in the
- other case to avoid infinite bouncing between different
- minimums. */
- if (cmp_min > 0 || cmp_min < 0)
- {
- if (!needs_overflow_infinity (TREE_TYPE (vr_result.min))
- || !vrp_var_may_overflow (lhs, phi))
- vr_result.min = TYPE_MIN_VALUE (TREE_TYPE (vr_result.min));
- else if (supports_overflow_infinity (TREE_TYPE (vr_result.min)))
- vr_result.min =
- negative_overflow_infinity (TREE_TYPE (vr_result.min));
- }
-
- /* Similarly, if the new maximum is smaller or larger than
- the previous one, go all the way to +INF. */
- if (cmp_max < 0 || cmp_max > 0)
- {
- if (!needs_overflow_infinity (TREE_TYPE (vr_result.max))
- || !vrp_var_may_overflow (lhs, phi))
- vr_result.max = TYPE_MAX_VALUE (TREE_TYPE (vr_result.max));
- else if (supports_overflow_infinity (TREE_TYPE (vr_result.max)))
- vr_result.max =
- positive_overflow_infinity (TREE_TYPE (vr_result.max));
- }
+ /* If the new minimum is larger than than the previous one
+ retain the old value. If the new minimum value is smaller
+ than the previous one and not -INF go all the way to -INF + 1.
+ In the first case, to avoid infinite bouncing between different
+ minimums, and in the other case to avoid iterating millions of
+ times to reach -INF. Going to -INF + 1 also lets the following
+ iteration compute whether there will be any overflow, at the
+ expense of one additional iteration. */
+ if (cmp_min < 0)
+ vr_result.min = lhs_vr->min;
+ else if (cmp_min > 0
+ && !vrp_val_is_min (vr_result.min))
+ vr_result.min
+ = int_const_binop (PLUS_EXPR,
+ vrp_val_min (TREE_TYPE (vr_result.min)),
+ build_int_cst (TREE_TYPE (vr_result.min), 1));
+
+ /* Similarly for the maximum value. */
+ if (cmp_max > 0)
+ vr_result.max = lhs_vr->max;
+ else if (cmp_max < 0
+ && !vrp_val_is_max (vr_result.max))
+ vr_result.max
+ = int_const_binop (MINUS_EXPR,
+ vrp_val_max (TREE_TYPE (vr_result.min)),
+ build_int_cst (TREE_TYPE (vr_result.min), 1));
/* If we dropped either bound to +-INF then if this is a loop
PHI node SCEV may known more about its value-range. */
if ((cmp_min > 0 || cmp_min < 0
|| cmp_max < 0 || cmp_max > 0)
- && current_loops
&& (l = loop_containing_stmt (phi))
&& l->header == gimple_bb (phi))
adjust_range_with_scev (&vr_result, l, phi, lhs);
print_generic_expr (dump_file, lhs, 0);
fprintf (dump_file, ": ");
dump_value_range (dump_file, &vr_result);
- fprintf (dump_file, "\n\n");
+ fprintf (dump_file, "\n");
}
+ if (vr_result.type == VR_VARYING)
+ return SSA_PROP_VARYING;
+
return SSA_PROP_INTERESTING;
}
if (rhs_code == EQ_EXPR)
{
if (TREE_CODE (op1) == INTEGER_CST)
- op1 = int_const_binop (BIT_XOR_EXPR, op1, integer_one_node);
+ op1 = int_const_binop (BIT_XOR_EXPR, op1,
+ build_int_cst (TREE_TYPE (op1), 1));
else
return false;
}
if (integer_zerop (op1))
gimple_assign_set_rhs_with_ops (gsi,
need_conversion
- ? NOP_EXPR : TREE_CODE (op0),
- op0, NULL_TREE);
+ ? NOP_EXPR : TREE_CODE (op0), op0);
/* For A != B we substitute A ^ B. Either with conversion. */
else if (need_conversion)
{
- tree tem = make_ssa_name (TREE_TYPE (op0), NULL);
- gimple newop = gimple_build_assign_with_ops (BIT_XOR_EXPR, tem, op0, op1);
+ tree tem = make_ssa_name (TREE_TYPE (op0));
+ gassign *newop
+ = gimple_build_assign (tem, BIT_XOR_EXPR, op0, op1);
gsi_insert_before (gsi, newop, GSI_SAME_STMT);
- gimple_assign_set_rhs_with_ops (gsi, NOP_EXPR, tem, NULL_TREE);
+ gimple_assign_set_rhs_with_ops (gsi, NOP_EXPR, tem);
}
/* Or without. */
else
/* Simplify a division or modulo operator to a right shift or
bitwise and if the first operand is unsigned or is greater
- than zero and the second operand is an exact power of two. */
+ than zero and the second operand is an exact power of two.
+ For TRUNC_MOD_EXPR op0 % op1 with constant op1, optimize it
+ into just op0 if op0's range is known to be a subset of
+ [-op1 + 1, op1 - 1] for signed and [0, op1 - 1] for unsigned
+ modulo. */
static bool
simplify_div_or_mod_using_ranges (gimple stmt)
tree val = NULL;
tree op0 = gimple_assign_rhs1 (stmt);
tree op1 = gimple_assign_rhs2 (stmt);
- value_range_t *vr = get_value_range (gimple_assign_rhs1 (stmt));
+ value_range_t *vr = get_value_range (op0);
+
+ if (rhs_code == TRUNC_MOD_EXPR
+ && TREE_CODE (op1) == INTEGER_CST
+ && tree_int_cst_sgn (op1) == 1
+ && range_int_cst_p (vr)
+ && tree_int_cst_lt (vr->max, op1))
+ {
+ if (TYPE_UNSIGNED (TREE_TYPE (op0))
+ || tree_int_cst_sgn (vr->min) >= 0
+ || tree_int_cst_lt (fold_unary (NEGATE_EXPR, TREE_TYPE (op1), op1),
+ vr->min))
+ {
+ /* If op0 already has the range op0 % op1 has,
+ then TRUNC_MOD_EXPR won't change anything. */
+ gimple_stmt_iterator gsi = gsi_for_stmt (stmt);
+ gimple_assign_set_rhs_from_tree (&gsi, op0);
+ update_stmt (stmt);
+ return true;
+ }
+ }
+
+ if (!integer_pow2p (op1))
+ return false;
if (TYPE_UNSIGNED (TREE_TYPE (op0)))
{
tree op = NULL_TREE;
value_range_t vr0 = VR_INITIALIZER;
value_range_t vr1 = VR_INITIALIZER;
- double_int may_be_nonzero0, may_be_nonzero1;
- double_int must_be_nonzero0, must_be_nonzero1;
- double_int mask;
+ wide_int may_be_nonzero0, may_be_nonzero1;
+ wide_int must_be_nonzero0, must_be_nonzero1;
+ wide_int mask;
if (TREE_CODE (op0) == SSA_NAME)
vr0 = *(get_value_range (op0));
else
return false;
- if (!zero_nonzero_bits_from_vr (&vr0, &may_be_nonzero0, &must_be_nonzero0))
+ if (!zero_nonzero_bits_from_vr (TREE_TYPE (op0), &vr0, &may_be_nonzero0,
+ &must_be_nonzero0))
return false;
- if (!zero_nonzero_bits_from_vr (&vr1, &may_be_nonzero1, &must_be_nonzero1))
+ if (!zero_nonzero_bits_from_vr (TREE_TYPE (op1), &vr1, &may_be_nonzero1,
+ &must_be_nonzero1))
return false;
switch (gimple_assign_rhs_code (stmt))
{
case BIT_AND_EXPR:
mask = may_be_nonzero0.and_not (must_be_nonzero1);
- if (mask.is_zero ())
+ if (mask == 0)
{
op = op0;
break;
}
mask = may_be_nonzero1.and_not (must_be_nonzero0);
- if (mask.is_zero ())
+ if (mask == 0)
{
op = op1;
break;
break;
case BIT_IOR_EXPR:
mask = may_be_nonzero0.and_not (must_be_nonzero1);
- if (mask.is_zero ())
+ if (mask == 0)
{
op = op1;
break;
}
mask = may_be_nonzero1.and_not (must_be_nonzero0);
- if (mask.is_zero ())
+ if (mask == 0)
{
op = op0;
break;
if (op == NULL_TREE)
return false;
- gimple_assign_set_rhs_with_ops (gsi, TREE_CODE (op), op, NULL);
+ gimple_assign_set_rhs_with_ops (gsi, TREE_CODE (op), op);
update_stmt (gsi_stmt (*gsi));
return true;
}
a known value range VR.
If there is one and only one value which will satisfy the
- conditional, then return that value. Else return NULL. */
+ conditional, then return that value. Else return NULL.
+
+ If signed overflow must be undefined for the value to satisfy
+ the conditional, then set *STRICT_OVERFLOW_P to true. */
static tree
test_for_singularity (enum tree_code cond_code, tree op0,
- tree op1, value_range_t *vr)
+ tree op1, value_range_t *vr,
+ bool *strict_overflow_p)
{
tree min = NULL;
tree max = NULL;
then there is only one value which can satisfy the condition,
return that value. */
if (operand_equal_p (min, max, 0) && is_gimple_min_invariant (min))
- return min;
+ {
+ if ((cond_code == LE_EXPR || cond_code == LT_EXPR)
+ && is_overflow_infinity (vr->max))
+ *strict_overflow_p = true;
+ if ((cond_code == GE_EXPR || cond_code == GT_EXPR)
+ && is_overflow_infinity (vr->min))
+ *strict_overflow_p = true;
+
+ return min;
+ }
}
return NULL;
}
by PRECISION and UNSIGNED_P. */
static bool
-range_fits_type_p (value_range_t *vr, unsigned precision, bool unsigned_p)
+range_fits_type_p (value_range_t *vr, unsigned dest_precision, signop dest_sgn)
{
tree src_type;
unsigned src_precision;
- double_int tem;
+ widest_int tem;
+ signop src_sgn;
/* We can only handle integral and pointer types. */
src_type = TREE_TYPE (vr->min);
&& !POINTER_TYPE_P (src_type))
return false;
- /* An extension is fine unless VR is signed and unsigned_p,
+ /* An extension is fine unless VR is SIGNED and dest_sgn is UNSIGNED,
and so is an identity transform. */
src_precision = TYPE_PRECISION (TREE_TYPE (vr->min));
- if ((src_precision < precision
- && !(unsigned_p && !TYPE_UNSIGNED (src_type)))
- || (src_precision == precision
- && TYPE_UNSIGNED (src_type) == unsigned_p))
+ src_sgn = TYPE_SIGN (src_type);
+ if ((src_precision < dest_precision
+ && !(dest_sgn == UNSIGNED && src_sgn == SIGNED))
+ || (src_precision == dest_precision && src_sgn == dest_sgn))
return true;
/* Now we can only handle ranges with constant bounds. */
|| TREE_CODE (vr->max) != INTEGER_CST)
return false;
- /* For sign changes, the MSB of the double_int has to be clear.
+ /* For sign changes, the MSB of the wide_int has to be clear.
An unsigned value with its MSB set cannot be represented by
- a signed double_int, while a negative value cannot be represented
- by an unsigned double_int. */
- if (TYPE_UNSIGNED (src_type) != unsigned_p
- && (TREE_INT_CST_HIGH (vr->min) | TREE_INT_CST_HIGH (vr->max)) < 0)
+ a signed wide_int, while a negative value cannot be represented
+ by an unsigned wide_int. */
+ if (src_sgn != dest_sgn
+ && (wi::lts_p (vr->min, 0) || wi::lts_p (vr->max, 0)))
return false;
/* Then we can perform the conversion on both ends and compare
the result for equality. */
- tem = tree_to_double_int (vr->min).ext (precision, unsigned_p);
- if (tree_to_double_int (vr->min) != tem)
+ tem = wi::ext (wi::to_widest (vr->min), dest_precision, dest_sgn);
+ if (tem != wi::to_widest (vr->min))
return false;
- tem = tree_to_double_int (vr->max).ext (precision, unsigned_p);
- if (tree_to_double_int (vr->max) != tem)
+ tem = wi::ext (wi::to_widest (vr->max), dest_precision, dest_sgn);
+ if (tem != wi::to_widest (vr->max))
return false;
return true;
the original conditional. */
static bool
-simplify_cond_using_ranges (gimple stmt)
+simplify_cond_using_ranges (gcond *stmt)
{
tree op0 = gimple_cond_lhs (stmt);
tree op1 = gimple_cond_rhs (stmt);
able to simplify this conditional. */
if (vr->type == VR_RANGE)
{
- tree new_tree = test_for_singularity (cond_code, op0, op1, vr);
+ enum warn_strict_overflow_code wc = WARN_STRICT_OVERFLOW_COMPARISON;
+ bool sop = false;
+ tree new_tree = test_for_singularity (cond_code, op0, op1, vr, &sop);
- if (new_tree)
+ if (new_tree
+ && (!sop || TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (op0))))
{
if (dump_file)
{
fprintf (dump_file, "\n");
}
+ if (sop && issue_strict_overflow_warning (wc))
+ {
+ location_t location = input_location;
+ if (gimple_has_location (stmt))
+ location = gimple_location (stmt);
+
+ warning_at (location, OPT_Wstrict_overflow,
+ "assuming signed overflow does not occur when "
+ "simplifying conditional");
+ }
+
return true;
}
/* Try again after inverting the condition. We only deal
with integral types here, so no need to worry about
issues with inverting FP comparisons. */
- cond_code = invert_tree_comparison (cond_code, false);
- new_tree = test_for_singularity (cond_code, op0, op1, vr);
+ sop = false;
+ new_tree = test_for_singularity
+ (invert_tree_comparison (cond_code, false),
+ op0, op1, vr, &sop);
- if (new_tree)
+ if (new_tree
+ && (!sop || TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (op0))))
{
if (dump_file)
{
fprintf (dump_file, "\n");
}
+ if (sop && issue_strict_overflow_warning (wc))
+ {
+ location_t location = input_location;
+ if (gimple_has_location (stmt))
+ location = gimple_location (stmt);
+
+ warning_at (location, OPT_Wstrict_overflow,
+ "assuming signed overflow does not occur when "
+ "simplifying conditional");
+ }
+
return true;
}
}
if (range_int_cst_p (vr)
&& range_fits_type_p (vr,
TYPE_PRECISION (TREE_TYPE (op0)),
- TYPE_UNSIGNED (TREE_TYPE (op0)))
+ TYPE_SIGN (TREE_TYPE (op0)))
&& int_fits_type_p (op1, TREE_TYPE (innerop))
/* The range must not have overflowed, or if it did overflow
we must not be wrapping/trapping overflow and optimizing
/* If the range overflowed and the user has asked for warnings
when strict overflow semantics were used to optimize code,
issue an appropriate warning. */
- if ((is_negative_overflow_infinity (vr->min)
- || is_positive_overflow_infinity (vr->max))
+ if (cond_code != EQ_EXPR && cond_code != NE_EXPR
+ && (is_negative_overflow_infinity (vr->min)
+ || is_positive_overflow_infinity (vr->max))
&& issue_strict_overflow_warning (WARN_STRICT_OVERFLOW_CONDITIONAL))
{
location_t location;
argument. */
static bool
-simplify_switch_using_ranges (gimple stmt)
+simplify_switch_using_ranges (gswitch *stmt)
{
tree op = gimple_switch_index (stmt);
value_range_t *vr;
tree innerop, middleop, finaltype;
gimple def_stmt;
value_range_t *innervr;
- bool inner_unsigned_p, middle_unsigned_p, final_unsigned_p;
+ signop inner_sgn, middle_sgn, final_sgn;
unsigned inner_prec, middle_prec, final_prec;
- double_int innermin, innermed, innermax, middlemin, middlemed, middlemax;
+ widest_int innermin, innermed, innermax, middlemin, middlemed, middlemax;
finaltype = TREE_TYPE (gimple_assign_lhs (stmt));
if (!INTEGRAL_TYPE_P (finaltype))
/* Simulate the conversion chain to check if the result is equal if
the middle conversion is removed. */
- innermin = tree_to_double_int (innervr->min);
- innermax = tree_to_double_int (innervr->max);
+ innermin = wi::to_widest (innervr->min);
+ innermax = wi::to_widest (innervr->max);
inner_prec = TYPE_PRECISION (TREE_TYPE (innerop));
middle_prec = TYPE_PRECISION (TREE_TYPE (middleop));
/* If the first conversion is not injective, the second must not
be widening. */
- if ((innermax - innermin).ugt (double_int::mask (middle_prec))
+ if (wi::gtu_p (innermax - innermin,
+ wi::mask <widest_int> (middle_prec, false))
&& middle_prec < final_prec)
return false;
/* We also want a medium value so that we can track the effect that
narrowing conversions with sign change have. */
- inner_unsigned_p = TYPE_UNSIGNED (TREE_TYPE (innerop));
- if (inner_unsigned_p)
- innermed = double_int::mask (inner_prec).lrshift (1, inner_prec);
+ inner_sgn = TYPE_SIGN (TREE_TYPE (innerop));
+ if (inner_sgn == UNSIGNED)
+ innermed = wi::shifted_mask <widest_int> (1, inner_prec - 1, false);
else
- innermed = double_int_zero;
- if (innermin.cmp (innermed, inner_unsigned_p) >= 0
- || innermed.cmp (innermax, inner_unsigned_p) >= 0)
+ innermed = 0;
+ if (wi::cmp (innermin, innermed, inner_sgn) >= 0
+ || wi::cmp (innermed, innermax, inner_sgn) >= 0)
innermed = innermin;
- middle_unsigned_p = TYPE_UNSIGNED (TREE_TYPE (middleop));
- middlemin = innermin.ext (middle_prec, middle_unsigned_p);
- middlemed = innermed.ext (middle_prec, middle_unsigned_p);
- middlemax = innermax.ext (middle_prec, middle_unsigned_p);
+ middle_sgn = TYPE_SIGN (TREE_TYPE (middleop));
+ middlemin = wi::ext (innermin, middle_prec, middle_sgn);
+ middlemed = wi::ext (innermed, middle_prec, middle_sgn);
+ middlemax = wi::ext (innermax, middle_prec, middle_sgn);
/* Require that the final conversion applied to both the original
and the intermediate range produces the same result. */
- final_unsigned_p = TYPE_UNSIGNED (finaltype);
- if (middlemin.ext (final_prec, final_unsigned_p)
- != innermin.ext (final_prec, final_unsigned_p)
- || middlemed.ext (final_prec, final_unsigned_p)
- != innermed.ext (final_prec, final_unsigned_p)
- || middlemax.ext (final_prec, final_unsigned_p)
- != innermax.ext (final_prec, final_unsigned_p))
+ final_sgn = TYPE_SIGN (finaltype);
+ if (wi::ext (middlemin, final_prec, final_sgn)
+ != wi::ext (innermin, final_prec, final_sgn)
+ || wi::ext (middlemed, final_prec, final_sgn)
+ != wi::ext (innermed, final_prec, final_sgn)
+ || wi::ext (middlemax, final_prec, final_sgn)
+ != wi::ext (innermax, final_prec, final_sgn))
return false;
gimple_assign_set_rhs1 (stmt, innerop);
{
tree rhs1 = gimple_assign_rhs1 (stmt);
value_range_t *vr = get_value_range (rhs1);
- enum machine_mode fltmode = TYPE_MODE (TREE_TYPE (gimple_assign_lhs (stmt)));
- enum machine_mode mode;
+ machine_mode fltmode = TYPE_MODE (TREE_TYPE (gimple_assign_lhs (stmt)));
+ machine_mode mode;
tree tem;
- gimple conv;
+ gassign *conv;
/* We can only handle constant ranges. */
if (vr->type != VR_RANGE
if (TYPE_UNSIGNED (TREE_TYPE (rhs1))
&& (can_float_p (fltmode, TYPE_MODE (TREE_TYPE (rhs1)), 0)
!= CODE_FOR_nothing)
- && range_fits_type_p (vr, GET_MODE_PRECISION
- (TYPE_MODE (TREE_TYPE (rhs1))), 0))
+ && range_fits_type_p (vr, TYPE_PRECISION (TREE_TYPE (rhs1)), SIGNED))
mode = TYPE_MODE (TREE_TYPE (rhs1));
/* If we can do the conversion in the current input mode do nothing. */
else if (can_float_p (fltmode, TYPE_MODE (TREE_TYPE (rhs1)),
or if the value-range does not fit in the signed type
try with a wider mode. */
if (can_float_p (fltmode, mode, 0) != CODE_FOR_nothing
- && range_fits_type_p (vr, GET_MODE_PRECISION (mode), 0))
+ && range_fits_type_p (vr, GET_MODE_PRECISION (mode), SIGNED))
break;
mode = GET_MODE_WIDER_MODE (mode);
/* It works, insert a truncation or sign-change before the
float conversion. */
tem = make_ssa_name (build_nonstandard_integer_type
- (GET_MODE_PRECISION (mode), 0), NULL);
- conv = gimple_build_assign_with_ops (NOP_EXPR, tem, rhs1, NULL_TREE);
+ (GET_MODE_PRECISION (mode), 0));
+ conv = gimple_build_assign (tem, NOP_EXPR, rhs1);
gsi_insert_before (gsi, conv, GSI_SAME_STMT);
gimple_assign_set_rhs1 (stmt, tem);
update_stmt (stmt);
return true;
}
+/* Simplify an internal fn call using ranges if possible. */
+
+static bool
+simplify_internal_call_using_ranges (gimple_stmt_iterator *gsi, gimple stmt)
+{
+ enum tree_code subcode;
+ bool is_ubsan = false;
+ bool ovf = false;
+ switch (gimple_call_internal_fn (stmt))
+ {
+ case IFN_UBSAN_CHECK_ADD:
+ subcode = PLUS_EXPR;
+ is_ubsan = true;
+ break;
+ case IFN_UBSAN_CHECK_SUB:
+ subcode = MINUS_EXPR;
+ is_ubsan = true;
+ break;
+ case IFN_UBSAN_CHECK_MUL:
+ subcode = MULT_EXPR;
+ is_ubsan = true;
+ break;
+ case IFN_ADD_OVERFLOW:
+ subcode = PLUS_EXPR;
+ break;
+ case IFN_SUB_OVERFLOW:
+ subcode = MINUS_EXPR;
+ break;
+ case IFN_MUL_OVERFLOW:
+ subcode = MULT_EXPR;
+ break;
+ default:
+ return false;
+ }
+
+ tree op0 = gimple_call_arg (stmt, 0);
+ tree op1 = gimple_call_arg (stmt, 1);
+ tree type;
+ if (is_ubsan)
+ type = TREE_TYPE (op0);
+ else if (gimple_call_lhs (stmt) == NULL_TREE)
+ return false;
+ else
+ type = TREE_TYPE (TREE_TYPE (gimple_call_lhs (stmt)));
+ if (!check_for_binary_op_overflow (subcode, type, op0, op1, &ovf)
+ || (is_ubsan && ovf))
+ return false;
+
+ gimple g;
+ location_t loc = gimple_location (stmt);
+ if (is_ubsan)
+ g = gimple_build_assign (gimple_call_lhs (stmt), subcode, op0, op1);
+ else
+ {
+ int prec = TYPE_PRECISION (type);
+ tree utype = type;
+ if (ovf
+ || !useless_type_conversion_p (type, TREE_TYPE (op0))
+ || !useless_type_conversion_p (type, TREE_TYPE (op1)))
+ utype = build_nonstandard_integer_type (prec, 1);
+ if (TREE_CODE (op0) == INTEGER_CST)
+ op0 = fold_convert (utype, op0);
+ else if (!useless_type_conversion_p (utype, TREE_TYPE (op0)))
+ {
+ g = gimple_build_assign (make_ssa_name (utype), NOP_EXPR, op0);
+ gimple_set_location (g, loc);
+ gsi_insert_before (gsi, g, GSI_SAME_STMT);
+ op0 = gimple_assign_lhs (g);
+ }
+ if (TREE_CODE (op1) == INTEGER_CST)
+ op1 = fold_convert (utype, op1);
+ else if (!useless_type_conversion_p (utype, TREE_TYPE (op1)))
+ {
+ g = gimple_build_assign (make_ssa_name (utype), NOP_EXPR, op1);
+ gimple_set_location (g, loc);
+ gsi_insert_before (gsi, g, GSI_SAME_STMT);
+ op1 = gimple_assign_lhs (g);
+ }
+ g = gimple_build_assign (make_ssa_name (utype), subcode, op0, op1);
+ gimple_set_location (g, loc);
+ gsi_insert_before (gsi, g, GSI_SAME_STMT);
+ if (utype != type)
+ {
+ g = gimple_build_assign (make_ssa_name (type), NOP_EXPR,
+ gimple_assign_lhs (g));
+ gimple_set_location (g, loc);
+ gsi_insert_before (gsi, g, GSI_SAME_STMT);
+ }
+ g = gimple_build_assign (gimple_call_lhs (stmt), COMPLEX_EXPR,
+ gimple_assign_lhs (g),
+ build_int_cst (type, ovf));
+ }
+ gimple_set_location (g, loc);
+ gsi_replace (gsi, g, false);
+ return true;
+}
+
/* Simplify STMT using ranges if possible. */
static bool
/* Transform TRUNC_DIV_EXPR and TRUNC_MOD_EXPR into RSHIFT_EXPR
and BIT_AND_EXPR respectively if the first operand is greater
- than zero and the second operand is an exact power of two. */
+ than zero and the second operand is an exact power of two.
+ Also optimize TRUNC_MOD_EXPR away if the second operand is
+ constant and the first operand already has the right value
+ range. */
case TRUNC_DIV_EXPR:
case TRUNC_MOD_EXPR:
- if (INTEGRAL_TYPE_P (TREE_TYPE (rhs1))
- && integer_pow2p (gimple_assign_rhs2 (stmt)))
+ if (TREE_CODE (rhs1) == SSA_NAME
+ && INTEGRAL_TYPE_P (TREE_TYPE (rhs1)))
return simplify_div_or_mod_using_ranges (stmt);
break;
}
}
else if (gimple_code (stmt) == GIMPLE_COND)
- return simplify_cond_using_ranges (stmt);
+ return simplify_cond_using_ranges (as_a <gcond *> (stmt));
else if (gimple_code (stmt) == GIMPLE_SWITCH)
- return simplify_switch_using_ranges (stmt);
+ return simplify_switch_using_ranges (as_a <gswitch *> (stmt));
+ else if (is_gimple_call (stmt)
+ && gimple_call_internal_p (stmt))
+ return simplify_internal_call_using_ranges (gsi, stmt);
return false;
}
gimple_assign_rhs2 (stmt),
stmt);
}
- else if (gimple_code (stmt) == GIMPLE_COND)
- val = vrp_evaluate_conditional (gimple_cond_code (stmt),
- gimple_cond_lhs (stmt),
- gimple_cond_rhs (stmt),
+ else if (gcond *cond_stmt = dyn_cast <gcond *> (stmt))
+ val = vrp_evaluate_conditional (gimple_cond_code (cond_stmt),
+ gimple_cond_lhs (cond_stmt),
+ gimple_cond_rhs (cond_stmt),
stmt);
else
return false;
else
{
gcc_assert (gimple_code (stmt) == GIMPLE_COND);
+ gcond *cond_stmt = as_a <gcond *> (stmt);
if (integer_zerop (val))
- gimple_cond_make_false (stmt);
+ gimple_cond_make_false (cond_stmt);
else if (integer_onep (val))
- gimple_cond_make_true (stmt);
+ gimple_cond_make_true (cond_stmt);
else
gcc_unreachable ();
}
return simplify_stmt_using_ranges (si);
}
-/* Stack of dest,src equivalency pairs that need to be restored after
- each attempt to thread a block's incoming edge to an outgoing edge.
-
- A NULL entry is used to mark the end of pairs which need to be
- restored. */
-static vec<tree> equiv_stack;
+/* Unwindable const/copy equivalences. */
+const_and_copies *equiv_stack;
/* A trivial wrapper so that we can present the generic jump threading
code with a simple API for simplifying statements. STMT is the
static tree
simplify_stmt_for_jump_threading (gimple stmt, gimple within_stmt)
{
- if (gimple_code (stmt) == GIMPLE_COND)
- return vrp_evaluate_conditional (gimple_cond_code (stmt),
- gimple_cond_lhs (stmt),
- gimple_cond_rhs (stmt), within_stmt);
+ if (gcond *cond_stmt = dyn_cast <gcond *> (stmt))
+ return vrp_evaluate_conditional (gimple_cond_code (cond_stmt),
+ gimple_cond_lhs (cond_stmt),
+ gimple_cond_rhs (cond_stmt),
+ within_stmt);
- if (gimple_code (stmt) == GIMPLE_ASSIGN)
+ if (gassign *assign_stmt = dyn_cast <gassign *> (stmt))
{
value_range_t new_vr = VR_INITIALIZER;
- tree lhs = gimple_assign_lhs (stmt);
+ tree lhs = gimple_assign_lhs (assign_stmt);
if (TREE_CODE (lhs) == SSA_NAME
&& (INTEGRAL_TYPE_P (TREE_TYPE (lhs))
|| POINTER_TYPE_P (TREE_TYPE (lhs))))
{
- extract_range_from_assignment (&new_vr, stmt);
+ extract_range_from_assignment (&new_vr, assign_stmt);
if (range_int_cst_singleton_p (&new_vr))
return new_vr.min;
}
identify_jump_threads (void)
{
basic_block bb;
- gimple dummy;
+ gcond *dummy;
int i;
edge e;
/* Allocate our unwinder stack to unwind any temporary equivalences
that might be recorded. */
- equiv_stack.create (20);
+ equiv_stack = new const_and_copies (dump_file, dump_flags);
/* To avoid lots of silly node creation, we create a single
conditional and just modify it in-place when attempting to
I doubt it's worth the effort for the classes of jump
threading opportunities we are trying to identify at this
point in compilation. */
- FOR_EACH_BB (bb)
+ FOR_EACH_BB_FN (bb, cfun)
{
gimple last;
if (! potentially_threadable_block (bb))
continue;
- /* We only care about blocks ending in a COND_EXPR. While there
- may be some value in handling SWITCH_EXPR here, I doubt it's
- terribly important. */
- last = gsi_stmt (gsi_last_bb (bb));
+ last = last_stmt (bb);
/* We're basically looking for a switch or any kind of conditional with
integral or pointer type arguments. Note the type of the second
argument will be the same as the first argument, so no need to
- check it explicitly. */
- if (gimple_code (last) == GIMPLE_SWITCH
+ check it explicitly.
+
+ We also handle the case where there are no statements in the
+ block. This come up with forwarder blocks that are not
+ optimized away because they lead to a loop header. But we do
+ want to thread through them as we can sometimes thread to the
+ loop exit which is obviously profitable. */
+ if (!last
+ || gimple_code (last) == GIMPLE_SWITCH
|| (gimple_code (last) == GIMPLE_COND
&& TREE_CODE (gimple_cond_lhs (last)) == SSA_NAME
&& (INTEGRAL_TYPE_P (TREE_TYPE (gimple_cond_lhs (last)))
if (e->flags & (EDGE_DFS_BACK | EDGE_COMPLEX))
continue;
- thread_across_edge (dummy, e, true, &equiv_stack,
+ thread_across_edge (dummy, e, true, equiv_stack,
simplify_stmt_for_jump_threading);
}
}
finalize_jump_threads (void)
{
thread_through_all_blocks (false);
- equiv_stack.release ();
+ delete equiv_stack;
}
substitute_and_fold (op_with_constant_singleton_value_range,
vrp_fold_stmt, false);
- if (warn_array_bounds)
+ if (warn_array_bounds && first_pass_instance)
check_all_array_refs ();
/* We must identify jump threading opportunities before we release
|| (vr_value[i]->type == VR_UNDEFINED))
continue;
- if ((TREE_CODE (vr_value[i]->min) == INTEGER_CST)
- && (TREE_CODE (vr_value[i]->max) == INTEGER_CST)
- && (vr_value[i]->type == VR_RANGE
- || vr_value[i]->type == VR_ANTI_RANGE))
- set_range_info (name, vr_value[i]->type,
- tree_to_double_int (vr_value[i]->min),
- tree_to_double_int (vr_value[i]->max));
+ if ((TREE_CODE (vr_value[i]->min) == INTEGER_CST)
+ && (TREE_CODE (vr_value[i]->max) == INTEGER_CST)
+ && (vr_value[i]->type == VR_RANGE
+ || vr_value[i]->type == VR_ANTI_RANGE))
+ set_range_info (name, vr_value[i]->type, vr_value[i]->min,
+ vr_value[i]->max);
}
/* Free allocated memory. */
if (to_remove_edges.length () > 0)
{
free_dominance_info (CDI_DOMINATORS);
- if (current_loops)
- loops_state_set (LOOPS_NEED_FIXUP);
+ loops_state_set (LOOPS_NEED_FIXUP);
}
to_remove_edges.release ();
return 0;
}
-static bool
-gate_vrp (void)
-{
- return flag_tree_vrp != 0;
-}
-
namespace {
const pass_data pass_data_vrp =
GIMPLE_PASS, /* type */
"vrp", /* name */
OPTGROUP_NONE, /* optinfo_flags */
- true, /* has_gate */
- true, /* has_execute */
TV_TREE_VRP, /* tv_id */
PROP_ssa, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
- ( TODO_cleanup_cfg | TODO_update_ssa
- | TODO_verify_ssa
- | TODO_verify_flow ), /* todo_flags_finish */
+ ( TODO_cleanup_cfg | TODO_update_ssa ), /* todo_flags_finish */
};
class pass_vrp : public gimple_opt_pass
/* opt_pass methods: */
opt_pass * clone () { return new pass_vrp (m_ctxt); }
- bool gate () { return gate_vrp (); }
- unsigned int execute () { return execute_vrp (); }
+ virtual bool gate (function *) { return flag_tree_vrp != 0; }
+ virtual unsigned int execute (function *) { return execute_vrp (); }
}; // class pass_vrp
projects / gcc.git / blobdiff