/* Utility routines for data type conversion for GCC.
- Copyright (C) 1987, 1988, 1991, 1992, 1993, 1994, 1995, 1997, 1998,
- 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
- Free Software Foundation, Inc.
+ Copyright (C) 1987-2018 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
/* These routines are somewhat language-independent utility function
#include "config.h"
#include "system.h"
#include "coretypes.h"
-#include "tm.h"
+#include "target.h"
#include "tree.h"
-#include "flags.h"
+#include "diagnostic-core.h"
+#include "fold-const.h"
+#include "stor-layout.h"
#include "convert.h"
-#include "toplev.h"
#include "langhooks.h"
-#include "real.h"
+#include "builtins.h"
+#include "ubsan.h"
+#include "stringpool.h"
+#include "attribs.h"
+#include "asan.h"
+
+#define maybe_fold_build1_loc(FOLD_P, LOC, CODE, TYPE, EXPR) \
+ ((FOLD_P) ? fold_build1_loc (LOC, CODE, TYPE, EXPR) \
+ : build1_loc (LOC, CODE, TYPE, EXPR))
+#define maybe_fold_build2_loc(FOLD_P, LOC, CODE, TYPE, EXPR1, EXPR2) \
+ ((FOLD_P) ? fold_build2_loc (LOC, CODE, TYPE, EXPR1, EXPR2) \
+ : build2_loc (LOC, CODE, TYPE, EXPR1, EXPR2))
/* Convert EXPR to some pointer or reference type TYPE.
EXPR must be pointer, reference, integer, enumeral, or literal zero;
- in other cases error is called. */
+ in other cases error is called. If FOLD_P is true, try to fold the
+ expression. */
-tree
-convert_to_pointer (tree type, tree expr)
+static tree
+convert_to_pointer_1 (tree type, tree expr, bool fold_p)
{
+ location_t loc = EXPR_LOCATION (expr);
if (TREE_TYPE (expr) == type)
return expr;
- /* Propagate overflow to the NULL pointer. */
- if (integer_zerop (expr))
- return force_fit_type_double (type, 0, 0, 0, TREE_OVERFLOW (expr));
-
switch (TREE_CODE (TREE_TYPE (expr)))
{
case POINTER_TYPE:
case REFERENCE_TYPE:
- return fold_build1 (NOP_EXPR, type, expr);
+ {
+ /* If the pointers point to different address spaces, conversion needs
+ to be done via a ADDR_SPACE_CONVERT_EXPR instead of a NOP_EXPR. */
+ addr_space_t to_as = TYPE_ADDR_SPACE (TREE_TYPE (type));
+ addr_space_t from_as = TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (expr)));
+
+ if (to_as == from_as)
+ return maybe_fold_build1_loc (fold_p, loc, NOP_EXPR, type, expr);
+ else
+ return maybe_fold_build1_loc (fold_p, loc, ADDR_SPACE_CONVERT_EXPR,
+ type, expr);
+ }
case INTEGER_TYPE:
case ENUMERAL_TYPE:
case BOOLEAN_TYPE:
- if (TYPE_PRECISION (TREE_TYPE (expr)) != POINTER_SIZE)
- expr = fold_build1 (NOP_EXPR,
- lang_hooks.types.type_for_size (POINTER_SIZE, 0),
- expr);
- return fold_build1 (CONVERT_EXPR, type, expr);
-
+ {
+ /* If the input precision differs from the target pointer type
+ precision, first convert the input expression to an integer type of
+ the target precision. Some targets, e.g. VMS, need several pointer
+ sizes to coexist so the latter isn't necessarily POINTER_SIZE. */
+ unsigned int pprec = TYPE_PRECISION (type);
+ unsigned int eprec = TYPE_PRECISION (TREE_TYPE (expr));
+
+ if (eprec != pprec)
+ expr
+ = maybe_fold_build1_loc (fold_p, loc, NOP_EXPR,
+ lang_hooks.types.type_for_size (pprec, 0),
+ expr);
+ }
+ return maybe_fold_build1_loc (fold_p, loc, CONVERT_EXPR, type, expr);
default:
error ("cannot convert to a pointer type");
- return convert_to_pointer (type, integer_zero_node);
+ return convert_to_pointer_1 (type, integer_zero_node, fold_p);
}
}
-/* Avoid any floating point extensions from EXP. */
+/* A wrapper around convert_to_pointer_1 that always folds the
+ expression. */
+
tree
-strip_float_extensions (tree exp)
+convert_to_pointer (tree type, tree expr)
{
- tree sub, expt, subt;
-
- /* For floating point constant look up the narrowest type that can hold
- it properly and handle it like (type)(narrowest_type)constant.
- This way we can optimize for instance a=a*2.0 where "a" is float
- but 2.0 is double constant. */
- if (TREE_CODE (exp) == REAL_CST)
- {
- REAL_VALUE_TYPE orig;
- tree type = NULL;
-
- orig = TREE_REAL_CST (exp);
- if (TYPE_PRECISION (TREE_TYPE (exp)) > TYPE_PRECISION (float_type_node)
- && exact_real_truncate (TYPE_MODE (float_type_node), &orig))
- type = float_type_node;
- else if (TYPE_PRECISION (TREE_TYPE (exp))
- > TYPE_PRECISION (double_type_node)
- && exact_real_truncate (TYPE_MODE (double_type_node), &orig))
- type = double_type_node;
- if (type)
- return build_real (type, real_value_truncate (TYPE_MODE (type), orig));
- }
-
- if (TREE_CODE (exp) != NOP_EXPR
- && TREE_CODE (exp) != CONVERT_EXPR)
- return exp;
-
- sub = TREE_OPERAND (exp, 0);
- subt = TREE_TYPE (sub);
- expt = TREE_TYPE (exp);
-
- if (!FLOAT_TYPE_P (subt))
- return exp;
+ return convert_to_pointer_1 (type, expr, true);
+}
- if (TYPE_PRECISION (subt) > TYPE_PRECISION (expt))
- return exp;
+/* A wrapper around convert_to_pointer_1 that only folds the
+ expression if DOFOLD, or if it is CONSTANT_CLASS_P. */
- return strip_float_extensions (sub);
+tree
+convert_to_pointer_maybe_fold (tree type, tree expr, bool dofold)
+{
+ return convert_to_pointer_1 (type, expr, dofold || CONSTANT_CLASS_P (expr));
}
-
/* Convert EXPR to some floating-point type TYPE.
- EXPR must be float, integer, or enumeral;
- in other cases error is called. */
+ EXPR must be float, fixed-point, integer, or enumeral;
+ in other cases error is called. If FOLD_P is true, try to fold
+ the expression. */
-tree
-convert_to_real (tree type, tree expr)
+static tree
+convert_to_real_1 (tree type, tree expr, bool fold_p)
{
enum built_in_function fcode = builtin_mathfn_code (expr);
tree itype = TREE_TYPE (expr);
+ location_t loc = EXPR_LOCATION (expr);
+
+ if (TREE_CODE (expr) == COMPOUND_EXPR)
+ {
+ tree t = convert_to_real_1 (type, TREE_OPERAND (expr, 1), fold_p);
+ if (t == TREE_OPERAND (expr, 1))
+ return expr;
+ return build2_loc (EXPR_LOCATION (expr), COMPOUND_EXPR, TREE_TYPE (t),
+ TREE_OPERAND (expr, 0), t);
+ }
/* Disable until we figure out how to decide whether the functions are
present in runtime. */
switch (fcode)
{
#define CASE_MATHFN(FN) case BUILT_IN_##FN: case BUILT_IN_##FN##L:
- CASE_MATHFN (ACOS)
- CASE_MATHFN (ACOSH)
- CASE_MATHFN (ASIN)
- CASE_MATHFN (ASINH)
- CASE_MATHFN (ATAN)
- CASE_MATHFN (ATANH)
- CASE_MATHFN (CBRT)
- CASE_MATHFN (COS)
CASE_MATHFN (COSH)
- CASE_MATHFN (ERF)
- CASE_MATHFN (ERFC)
CASE_MATHFN (EXP)
CASE_MATHFN (EXP10)
CASE_MATHFN (EXP2)
- CASE_MATHFN (EXPM1)
- CASE_MATHFN (FABS)
+ CASE_MATHFN (EXPM1)
CASE_MATHFN (GAMMA)
CASE_MATHFN (J0)
CASE_MATHFN (J1)
CASE_MATHFN (LGAMMA)
- CASE_MATHFN (LOG)
- CASE_MATHFN (LOG10)
- CASE_MATHFN (LOG1P)
- CASE_MATHFN (LOG2)
- CASE_MATHFN (LOGB)
CASE_MATHFN (POW10)
- CASE_MATHFN (SIN)
CASE_MATHFN (SINH)
- CASE_MATHFN (SQRT)
- CASE_MATHFN (TAN)
- CASE_MATHFN (TANH)
CASE_MATHFN (TGAMMA)
CASE_MATHFN (Y0)
CASE_MATHFN (Y1)
+ /* The above functions may set errno differently with float
+ input or output so this transformation is not safe with
+ -fmath-errno. */
+ if (flag_errno_math)
+ break;
+ gcc_fallthrough ();
+ CASE_MATHFN (ACOS)
+ CASE_MATHFN (ACOSH)
+ CASE_MATHFN (ASIN)
+ CASE_MATHFN (ASINH)
+ CASE_MATHFN (ATAN)
+ CASE_MATHFN (ATANH)
+ CASE_MATHFN (CBRT)
+ CASE_MATHFN (COS)
+ CASE_MATHFN (ERF)
+ CASE_MATHFN (ERFC)
+ CASE_MATHFN (LOG)
+ CASE_MATHFN (LOG10)
+ CASE_MATHFN (LOG2)
+ CASE_MATHFN (LOG1P)
+ CASE_MATHFN (SIN)
+ CASE_MATHFN (TAN)
+ CASE_MATHFN (TANH)
+ /* The above functions are not safe to do this conversion. */
+ if (!flag_unsafe_math_optimizations)
+ break;
+ gcc_fallthrough ();
+ CASE_MATHFN (SQRT)
+ CASE_MATHFN (FABS)
+ CASE_MATHFN (LOGB)
#undef CASE_MATHFN
{
tree arg0 = strip_float_extensions (CALL_EXPR_ARG (expr, 0));
if (TYPE_PRECISION (TREE_TYPE (arg0)) > TYPE_PRECISION (type))
newtype = TREE_TYPE (arg0);
+ /* We consider to convert
+
+ (T1) sqrtT2 ((T2) exprT3)
+ to
+ (T1) sqrtT4 ((T4) exprT3)
+
+ , where T1 is TYPE, T2 is ITYPE, T3 is TREE_TYPE (ARG0),
+ and T4 is NEWTYPE. All those types are of floating point types.
+ T4 (NEWTYPE) should be narrower than T2 (ITYPE). This conversion
+ is safe only if P1 >= P2*2+2, where P1 and P2 are precisions of
+ T2 and T4. See the following URL for a reference:
+ http://stackoverflow.com/questions/9235456/determining-
+ floating-point-square-root
+ */
+ if ((fcode == BUILT_IN_SQRT || fcode == BUILT_IN_SQRTL)
+ && !flag_unsafe_math_optimizations)
+ {
+ /* The following conversion is unsafe even the precision condition
+ below is satisfied:
+
+ (float) sqrtl ((long double) double_val) -> (float) sqrt (double_val)
+ */
+ if (TYPE_MODE (type) != TYPE_MODE (newtype))
+ break;
+
+ int p1 = REAL_MODE_FORMAT (TYPE_MODE (itype))->p;
+ int p2 = REAL_MODE_FORMAT (TYPE_MODE (newtype))->p;
+ if (p1 < p2 * 2 + 2)
+ break;
+ }
+
/* Be careful about integer to fp conversions.
These may overflow still. */
if (FLOAT_TYPE_P (TREE_TYPE (arg0))
&& TYPE_PRECISION (newtype) < TYPE_PRECISION (itype)
&& (TYPE_MODE (newtype) == TYPE_MODE (double_type_node)
|| TYPE_MODE (newtype) == TYPE_MODE (float_type_node)))
- {
+ {
tree fn = mathfn_built_in (newtype, fcode);
-
if (fn)
- {
- tree arg = fold (convert_to_real (newtype, arg0));
- expr = build_call_expr (fn, 1, arg);
- if (newtype == type)
- return expr;
- }
+ {
+ tree arg = convert_to_real_1 (newtype, arg0, fold_p);
+ expr = build_call_expr (fn, 1, arg);
+ if (newtype == type)
+ return expr;
+ }
}
}
default:
break;
}
}
- if (optimize
- && (((fcode == BUILT_IN_FLOORL
- || fcode == BUILT_IN_CEILL
- || fcode == BUILT_IN_ROUNDL
- || fcode == BUILT_IN_RINTL
- || fcode == BUILT_IN_TRUNCL
- || fcode == BUILT_IN_NEARBYINTL)
- && (TYPE_MODE (type) == TYPE_MODE (double_type_node)
- || TYPE_MODE (type) == TYPE_MODE (float_type_node)))
- || ((fcode == BUILT_IN_FLOOR
- || fcode == BUILT_IN_CEIL
- || fcode == BUILT_IN_ROUND
- || fcode == BUILT_IN_RINT
- || fcode == BUILT_IN_TRUNC
- || fcode == BUILT_IN_NEARBYINT)
- && (TYPE_MODE (type) == TYPE_MODE (float_type_node)))))
- {
- tree fn = mathfn_built_in (type, fcode);
-
- if (fn)
- {
- tree arg = strip_float_extensions (CALL_EXPR_ARG (expr, 0));
-
- /* Make sure (type)arg0 is an extension, otherwise we could end up
- changing (float)floor(double d) into floorf((float)d), which is
- incorrect because (float)d uses round-to-nearest and can round
- up to the next integer. */
- if (TYPE_PRECISION (type) >= TYPE_PRECISION (TREE_TYPE (arg)))
- return build_call_expr (fn, 1, fold (convert_to_real (type, arg)));
- }
- }
/* Propagate the cast into the operation. */
if (itype != type && FLOAT_TYPE_P (type))
switch (TREE_CODE (expr))
{
/* Convert (float)-x into -(float)x. This is safe for
- round-to-nearest rounding mode. */
+ round-to-nearest rounding mode when the inner type is float. */
case ABS_EXPR:
case NEGATE_EXPR:
if (!flag_rounding_math
- && TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (expr)))
- return build1 (TREE_CODE (expr), type,
- fold (convert_to_real (type,
- TREE_OPERAND (expr, 0))));
+ && FLOAT_TYPE_P (itype)
+ && TYPE_PRECISION (type) < TYPE_PRECISION (itype))
+ {
+ tree arg = convert_to_real_1 (type, TREE_OPERAND (expr, 0),
+ fold_p);
+ return build1 (TREE_CODE (expr), type, arg);
+ }
break;
/* Convert (outertype)((innertype0)a+(innertype1)b)
into ((newtype)a+(newtype)b) where newtype
tree arg1 = strip_float_extensions (TREE_OPERAND (expr, 1));
if (FLOAT_TYPE_P (TREE_TYPE (arg0))
- && FLOAT_TYPE_P (TREE_TYPE (arg1)))
+ && FLOAT_TYPE_P (TREE_TYPE (arg1))
+ && DECIMAL_FLOAT_TYPE_P (itype) == DECIMAL_FLOAT_TYPE_P (type))
{
tree newtype = type;
if (TYPE_MODE (TREE_TYPE (arg0)) == SDmode
- || TYPE_MODE (TREE_TYPE (arg1)) == SDmode)
+ || TYPE_MODE (TREE_TYPE (arg1)) == SDmode
+ || TYPE_MODE (type) == SDmode)
newtype = dfloat32_type_node;
if (TYPE_MODE (TREE_TYPE (arg0)) == DDmode
- || TYPE_MODE (TREE_TYPE (arg1)) == DDmode)
+ || TYPE_MODE (TREE_TYPE (arg1)) == DDmode
+ || TYPE_MODE (type) == DDmode)
newtype = dfloat64_type_node;
if (TYPE_MODE (TREE_TYPE (arg0)) == TDmode
- || TYPE_MODE (TREE_TYPE (arg1)) == TDmode)
+ || TYPE_MODE (TREE_TYPE (arg1)) == TDmode
+ || TYPE_MODE (type) == TDmode)
newtype = dfloat128_type_node;
if (newtype == dfloat32_type_node
|| newtype == dfloat64_type_node
|| newtype == dfloat128_type_node)
{
expr = build2 (TREE_CODE (expr), newtype,
- fold (convert_to_real (newtype, arg0)),
- fold (convert_to_real (newtype, arg1)));
+ convert_to_real_1 (newtype, arg0,
+ fold_p),
+ convert_to_real_1 (newtype, arg1,
+ fold_p));
if (newtype == type)
return expr;
break;
newtype = TREE_TYPE (arg0);
if (TYPE_PRECISION (TREE_TYPE (arg1)) > TYPE_PRECISION (newtype))
newtype = TREE_TYPE (arg1);
- if (TYPE_PRECISION (newtype) < TYPE_PRECISION (itype))
+ /* Sometimes this transformation is safe (cannot
+ change results through affecting double rounding
+ cases) and sometimes it is not. If NEWTYPE is
+ wider than TYPE, e.g. (float)((long double)double
+ + (long double)double) converted to
+ (float)(double + double), the transformation is
+ unsafe regardless of the details of the types
+ involved; double rounding can arise if the result
+ of NEWTYPE arithmetic is a NEWTYPE value half way
+ between two representable TYPE values but the
+ exact value is sufficiently different (in the
+ right direction) for this difference to be
+ visible in ITYPE arithmetic. If NEWTYPE is the
+ same as TYPE, however, the transformation may be
+ safe depending on the types involved: it is safe
+ if the ITYPE has strictly more than twice as many
+ mantissa bits as TYPE, can represent infinities
+ and NaNs if the TYPE can, and has sufficient
+ exponent range for the product or ratio of two
+ values representable in the TYPE to be within the
+ range of normal values of ITYPE. */
+ if (TYPE_PRECISION (newtype) < TYPE_PRECISION (itype)
+ && (flag_unsafe_math_optimizations
+ || (TYPE_PRECISION (newtype) == TYPE_PRECISION (type)
+ && real_can_shorten_arithmetic (TYPE_MODE (itype),
+ TYPE_MODE (type))
+ && !excess_precision_type (newtype))))
{
expr = build2 (TREE_CODE (expr), newtype,
- fold (convert_to_real (newtype, arg0)),
- fold (convert_to_real (newtype, arg1)));
+ convert_to_real_1 (newtype, arg0,
+ fold_p),
+ convert_to_real_1 (newtype, arg1,
+ fold_p));
if (newtype == type)
return expr;
}
case REAL_TYPE:
/* Ignore the conversion if we don't need to store intermediate
results and neither type is a decimal float. */
- return build1 ((flag_float_store
- || DECIMAL_FLOAT_TYPE_P (type)
- || DECIMAL_FLOAT_TYPE_P (itype))
- ? CONVERT_EXPR : NOP_EXPR, type, expr);
+ return build1_loc (loc,
+ (flag_float_store
+ || DECIMAL_FLOAT_TYPE_P (type)
+ || DECIMAL_FLOAT_TYPE_P (itype))
+ ? CONVERT_EXPR : NOP_EXPR, type, expr);
case INTEGER_TYPE:
case ENUMERAL_TYPE:
case BOOLEAN_TYPE:
return build1 (FLOAT_EXPR, type, expr);
+ case FIXED_POINT_TYPE:
+ return build1 (FIXED_CONVERT_EXPR, type, expr);
+
case COMPLEX_TYPE:
return convert (type,
- fold_build1 (REALPART_EXPR,
- TREE_TYPE (TREE_TYPE (expr)), expr));
+ maybe_fold_build1_loc (fold_p, loc, REALPART_EXPR,
+ TREE_TYPE (TREE_TYPE (expr)),
+ expr));
case POINTER_TYPE:
case REFERENCE_TYPE:
error ("pointer value used where a floating point value was expected");
- return convert_to_real (type, integer_zero_node);
+ return convert_to_real_1 (type, integer_zero_node, fold_p);
default:
error ("aggregate value used where a float was expected");
- return convert_to_real (type, integer_zero_node);
+ return convert_to_real_1 (type, integer_zero_node, fold_p);
}
}
+/* A wrapper around convert_to_real_1 that always folds the
+ expression. */
+
+tree
+convert_to_real (tree type, tree expr)
+{
+ return convert_to_real_1 (type, expr, true);
+}
+
+/* A wrapper around convert_to_real_1 that only folds the
+ expression if DOFOLD, or if it is CONSTANT_CLASS_P. */
+
+tree
+convert_to_real_maybe_fold (tree type, tree expr, bool dofold)
+{
+ return convert_to_real_1 (type, expr, dofold || CONSTANT_CLASS_P (expr));
+}
+
+/* Try to narrow EX_FORM ARG0 ARG1 in narrowed arg types producing a
+ result in TYPE. */
+
+static tree
+do_narrow (location_t loc,
+ enum tree_code ex_form, tree type, tree arg0, tree arg1,
+ tree expr, unsigned inprec, unsigned outprec, bool dofold)
+{
+ /* Do the arithmetic in type TYPEX,
+ then convert result to TYPE. */
+ tree typex = type;
+
+ /* Can't do arithmetic in enumeral types
+ so use an integer type that will hold the values. */
+ if (TREE_CODE (typex) == ENUMERAL_TYPE)
+ typex = lang_hooks.types.type_for_size (TYPE_PRECISION (typex),
+ TYPE_UNSIGNED (typex));
+
+ /* The type demotion below might cause doing unsigned arithmetic
+ instead of signed, and thus hide overflow bugs. */
+ if ((ex_form == PLUS_EXPR || ex_form == MINUS_EXPR)
+ && !TYPE_UNSIGNED (typex)
+ && sanitize_flags_p (SANITIZE_SI_OVERFLOW))
+ return NULL_TREE;
+
+ /* But now perhaps TYPEX is as wide as INPREC.
+ In that case, do nothing special here.
+ (Otherwise would recurse infinitely in convert. */
+ if (TYPE_PRECISION (typex) != inprec)
+ {
+ /* Don't do unsigned arithmetic where signed was wanted,
+ or vice versa.
+ Exception: if both of the original operands were
+ unsigned then we can safely do the work as unsigned.
+ Exception: shift operations take their type solely
+ from the first argument.
+ Exception: the LSHIFT_EXPR case above requires that
+ we perform this operation unsigned lest we produce
+ signed-overflow undefinedness.
+ And we may need to do it as unsigned
+ if we truncate to the original size. */
+ if (TYPE_UNSIGNED (TREE_TYPE (expr))
+ || (TYPE_UNSIGNED (TREE_TYPE (arg0))
+ && (TYPE_UNSIGNED (TREE_TYPE (arg1))
+ || ex_form == LSHIFT_EXPR
+ || ex_form == RSHIFT_EXPR
+ || ex_form == LROTATE_EXPR
+ || ex_form == RROTATE_EXPR))
+ || ex_form == LSHIFT_EXPR
+ /* If we have !flag_wrapv, and either ARG0 or
+ ARG1 is of a signed type, we have to do
+ PLUS_EXPR, MINUS_EXPR or MULT_EXPR in an unsigned
+ type in case the operation in outprec precision
+ could overflow. Otherwise, we would introduce
+ signed-overflow undefinedness. */
+ || ((!(INTEGRAL_TYPE_P (TREE_TYPE (arg0))
+ && TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg0)))
+ || !(INTEGRAL_TYPE_P (TREE_TYPE (arg1))
+ && TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg1))))
+ && ((TYPE_PRECISION (TREE_TYPE (arg0)) * 2u
+ > outprec)
+ || (TYPE_PRECISION (TREE_TYPE (arg1)) * 2u
+ > outprec))
+ && (ex_form == PLUS_EXPR
+ || ex_form == MINUS_EXPR
+ || ex_form == MULT_EXPR)))
+ {
+ if (!TYPE_UNSIGNED (typex))
+ typex = unsigned_type_for (typex);
+ }
+ else
+ {
+ if (TYPE_UNSIGNED (typex))
+ typex = signed_type_for (typex);
+ }
+ /* We should do away with all this once we have a proper
+ type promotion/demotion pass, see PR45397. */
+ expr = maybe_fold_build2_loc (dofold, loc, ex_form, typex,
+ convert (typex, arg0),
+ convert (typex, arg1));
+ return convert (type, expr);
+ }
+
+ return NULL_TREE;
+}
+
/* Convert EXPR to some integer (or enum) type TYPE.
- EXPR must be pointer, integer, discrete (enum, char, or bool), float, or
- vector; in other cases error is called.
+ EXPR must be pointer, integer, discrete (enum, char, or bool), float,
+ fixed-point or vector; in other cases error is called.
+
+ If DOFOLD is TRUE, we try to simplify newly-created patterns by folding.
The result of this is always supposed to be a newly created tree node
not in use in any existing structure. */
-tree
-convert_to_integer (tree type, tree expr)
+static tree
+convert_to_integer_1 (tree type, tree expr, bool dofold)
{
enum tree_code ex_form = TREE_CODE (expr);
tree intype = TREE_TYPE (expr);
- unsigned int inprec = TYPE_PRECISION (intype);
- unsigned int outprec = TYPE_PRECISION (type);
+ unsigned int inprec = element_precision (intype);
+ unsigned int outprec = element_precision (type);
+ location_t loc = EXPR_LOCATION (expr);
/* An INTEGER_TYPE cannot be incomplete, but an ENUMERAL_TYPE can
be. Consider `enum E = { a, b = (enum E) 3 };'. */
return error_mark_node;
}
+ if (ex_form == COMPOUND_EXPR)
+ {
+ tree t = convert_to_integer_1 (type, TREE_OPERAND (expr, 1), dofold);
+ if (t == TREE_OPERAND (expr, 1))
+ return expr;
+ return build2_loc (EXPR_LOCATION (expr), COMPOUND_EXPR, TREE_TYPE (t),
+ TREE_OPERAND (expr, 0), t);
+ }
+
/* Convert e.g. (long)round(d) -> lround(d). */
/* If we're converting to char, we may encounter differing behavior
between converting from double->char vs double->long->char.
tree s_intype = TREE_TYPE (s_expr);
const enum built_in_function fcode = builtin_mathfn_code (s_expr);
tree fn = 0;
-
+
switch (fcode)
{
CASE_FLT_FN (BUILT_IN_CEIL):
+ CASE_FLT_FN_FLOATN_NX (BUILT_IN_CEIL):
/* Only convert in ISO C99 mode. */
- if (!TARGET_C99_FUNCTIONS)
+ if (!targetm.libc_has_function (function_c99_misc))
break;
- if (outprec < TYPE_PRECISION (long_integer_type_node)
- || (outprec == TYPE_PRECISION (long_integer_type_node)
+ if (outprec < TYPE_PRECISION (integer_type_node)
+ || (outprec == TYPE_PRECISION (integer_type_node)
&& !TYPE_UNSIGNED (type)))
+ fn = mathfn_built_in (s_intype, BUILT_IN_ICEIL);
+ else if (outprec == TYPE_PRECISION (long_integer_type_node)
+ && !TYPE_UNSIGNED (type))
fn = mathfn_built_in (s_intype, BUILT_IN_LCEIL);
else if (outprec == TYPE_PRECISION (long_long_integer_type_node)
&& !TYPE_UNSIGNED (type))
break;
CASE_FLT_FN (BUILT_IN_FLOOR):
+ CASE_FLT_FN_FLOATN_NX (BUILT_IN_FLOOR):
/* Only convert in ISO C99 mode. */
- if (!TARGET_C99_FUNCTIONS)
+ if (!targetm.libc_has_function (function_c99_misc))
break;
- if (outprec < TYPE_PRECISION (long_integer_type_node)
- || (outprec == TYPE_PRECISION (long_integer_type_node)
+ if (outprec < TYPE_PRECISION (integer_type_node)
+ || (outprec == TYPE_PRECISION (integer_type_node)
&& !TYPE_UNSIGNED (type)))
+ fn = mathfn_built_in (s_intype, BUILT_IN_IFLOOR);
+ else if (outprec == TYPE_PRECISION (long_integer_type_node)
+ && !TYPE_UNSIGNED (type))
fn = mathfn_built_in (s_intype, BUILT_IN_LFLOOR);
else if (outprec == TYPE_PRECISION (long_long_integer_type_node)
&& !TYPE_UNSIGNED (type))
break;
CASE_FLT_FN (BUILT_IN_ROUND):
- if (outprec < TYPE_PRECISION (long_integer_type_node)
- || (outprec == TYPE_PRECISION (long_integer_type_node)
+ CASE_FLT_FN_FLOATN_NX (BUILT_IN_ROUND):
+ /* Only convert in ISO C99 mode and with -fno-math-errno. */
+ if (!targetm.libc_has_function (function_c99_misc) || flag_errno_math)
+ break;
+ if (outprec < TYPE_PRECISION (integer_type_node)
+ || (outprec == TYPE_PRECISION (integer_type_node)
&& !TYPE_UNSIGNED (type)))
+ fn = mathfn_built_in (s_intype, BUILT_IN_IROUND);
+ else if (outprec == TYPE_PRECISION (long_integer_type_node)
+ && !TYPE_UNSIGNED (type))
fn = mathfn_built_in (s_intype, BUILT_IN_LROUND);
else if (outprec == TYPE_PRECISION (long_long_integer_type_node)
&& !TYPE_UNSIGNED (type))
break;
CASE_FLT_FN (BUILT_IN_NEARBYINT):
+ CASE_FLT_FN_FLOATN_NX (BUILT_IN_NEARBYINT):
/* Only convert nearbyint* if we can ignore math exceptions. */
if (flag_trapping_math)
break;
- /* ... Fall through ... */
+ gcc_fallthrough ();
CASE_FLT_FN (BUILT_IN_RINT):
- if (outprec < TYPE_PRECISION (long_integer_type_node)
- || (outprec == TYPE_PRECISION (long_integer_type_node)
+ CASE_FLT_FN_FLOATN_NX (BUILT_IN_RINT):
+ /* Only convert in ISO C99 mode and with -fno-math-errno. */
+ if (!targetm.libc_has_function (function_c99_misc) || flag_errno_math)
+ break;
+ if (outprec < TYPE_PRECISION (integer_type_node)
+ || (outprec == TYPE_PRECISION (integer_type_node)
&& !TYPE_UNSIGNED (type)))
+ fn = mathfn_built_in (s_intype, BUILT_IN_IRINT);
+ else if (outprec == TYPE_PRECISION (long_integer_type_node)
+ && !TYPE_UNSIGNED (type))
fn = mathfn_built_in (s_intype, BUILT_IN_LRINT);
else if (outprec == TYPE_PRECISION (long_long_integer_type_node)
&& !TYPE_UNSIGNED (type))
break;
CASE_FLT_FN (BUILT_IN_TRUNC):
- return convert_to_integer (type, CALL_EXPR_ARG (s_expr, 0));
+ CASE_FLT_FN_FLOATN_NX (BUILT_IN_TRUNC):
+ return convert_to_integer_1 (type, CALL_EXPR_ARG (s_expr, 0), dofold);
+
+ default:
+ break;
+ }
+
+ if (fn)
+ {
+ tree newexpr = build_call_expr (fn, 1, CALL_EXPR_ARG (s_expr, 0));
+ return convert_to_integer_1 (type, newexpr, dofold);
+ }
+ }
+
+ /* Convert (int)logb(d) -> ilogb(d). */
+ if (optimize
+ && flag_unsafe_math_optimizations
+ && !flag_trapping_math && !flag_errno_math && flag_finite_math_only
+ && integer_type_node
+ && (outprec > TYPE_PRECISION (integer_type_node)
+ || (outprec == TYPE_PRECISION (integer_type_node)
+ && !TYPE_UNSIGNED (type))))
+ {
+ tree s_expr = strip_float_extensions (expr);
+ tree s_intype = TREE_TYPE (s_expr);
+ const enum built_in_function fcode = builtin_mathfn_code (s_expr);
+ tree fn = 0;
+
+ switch (fcode)
+ {
+ CASE_FLT_FN (BUILT_IN_LOGB):
+ fn = mathfn_built_in (s_intype, BUILT_IN_ILOGB);
+ break;
default:
break;
}
-
+
if (fn)
{
tree newexpr = build_call_expr (fn, 1, CALL_EXPR_ARG (s_expr, 0));
- return convert_to_integer (type, newexpr);
+ return convert_to_integer_1 (type, newexpr, dofold);
}
}
{
case POINTER_TYPE:
case REFERENCE_TYPE:
- if (integer_zerop (expr))
+ if (integer_zerop (expr) && !TREE_OVERFLOW (expr))
return build_int_cst (type, 0);
- /* Convert to an unsigned integer of the correct width first,
- and from there widen/truncate to the required type. */
+ /* Convert to an unsigned integer of the correct width first, and from
+ there widen/truncate to the required type. Some targets support the
+ coexistence of multiple valid pointer sizes, so fetch the one we need
+ from the type. */
+ if (!dofold)
+ return build1 (CONVERT_EXPR, type, expr);
expr = fold_build1 (CONVERT_EXPR,
- lang_hooks.types.type_for_size (POINTER_SIZE, 0),
+ lang_hooks.types.type_for_size
+ (TYPE_PRECISION (intype), 0),
expr);
return fold_convert (type, expr);
case INTEGER_TYPE:
case ENUMERAL_TYPE:
case BOOLEAN_TYPE:
+ case OFFSET_TYPE:
/* If this is a logical operation, which just returns 0 or 1, we can
change the type of the expression. */
else if (outprec >= inprec)
{
enum tree_code code;
- tree tem;
/* If the precision of the EXPR's type is K bits and the
destination mode has more bits, and the sign is changing,
the signed-to-unsigned case the high-order bits have to
be cleared. */
if (TYPE_UNSIGNED (type) != TYPE_UNSIGNED (TREE_TYPE (expr))
- && (TYPE_PRECISION (TREE_TYPE (expr))
- != GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (expr)))))
+ && !type_has_mode_precision_p (TREE_TYPE (expr)))
code = CONVERT_EXPR;
else
code = NOP_EXPR;
- tem = fold_unary (code, type, expr);
- if (tem)
- return tem;
-
- tem = build1 (code, type, expr);
- TREE_NO_WARNING (tem) = 1;
- return tem;
+ return maybe_fold_build1_loc (dofold, loc, code, type, expr);
}
/* If TYPE is an enumeral type or a type with a precision less
type corresponding to its mode, then do a nop conversion
to TYPE. */
else if (TREE_CODE (type) == ENUMERAL_TYPE
- || outprec != GET_MODE_BITSIZE (TYPE_MODE (type)))
- return build1 (NOP_EXPR, type,
- convert (lang_hooks.types.type_for_mode
- (TYPE_MODE (type), TYPE_UNSIGNED (type)),
- expr));
+ || maybe_ne (outprec, GET_MODE_PRECISION (TYPE_MODE (type))))
+ {
+ expr
+ = convert_to_integer_1 (lang_hooks.types.type_for_mode
+ (TYPE_MODE (type), TYPE_UNSIGNED (type)),
+ expr, dofold);
+ return maybe_fold_build1_loc (dofold, loc, NOP_EXPR, type, expr);
+ }
/* Here detect when we can distribute the truncation down past some
arithmetic. For example, if adding two longs and converting to an
two narrow values can be combined in their narrow type even to
make a wider result--are handled by "shorten" in build_binary_op. */
- switch (ex_form)
- {
- case RSHIFT_EXPR:
- /* We can pass truncation down through right shifting
- when the shift count is a nonpositive constant. */
- if (TREE_CODE (TREE_OPERAND (expr, 1)) == INTEGER_CST
- && tree_int_cst_sgn (TREE_OPERAND (expr, 1)) <= 0)
- goto trunc1;
- break;
-
- case LSHIFT_EXPR:
- /* We can pass truncation down through left shifting
- when the shift count is a nonnegative constant and
- the target type is unsigned. */
- if (TREE_CODE (TREE_OPERAND (expr, 1)) == INTEGER_CST
- && tree_int_cst_sgn (TREE_OPERAND (expr, 1)) >= 0
- && TYPE_UNSIGNED (type)
- && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST)
- {
- /* If shift count is less than the width of the truncated type,
- really shift. */
- if (tree_int_cst_lt (TREE_OPERAND (expr, 1), TYPE_SIZE (type)))
- /* In this case, shifting is like multiplication. */
- goto trunc1;
- else
- {
- /* If it is >= that width, result is zero.
- Handling this with trunc1 would give the wrong result:
- (int) ((long long) a << 32) is well defined (as 0)
- but (int) a << 32 is undefined and would get a
- warning. */
-
- tree t = build_int_cst (type, 0);
-
- /* If the original expression had side-effects, we must
- preserve it. */
- if (TREE_SIDE_EFFECTS (expr))
- return build2 (COMPOUND_EXPR, type, expr, t);
- else
- return t;
- }
- }
- break;
-
- case MAX_EXPR:
- case MIN_EXPR:
- case MULT_EXPR:
+ if (dofold)
+ switch (ex_form)
{
- tree arg0 = get_unwidened (TREE_OPERAND (expr, 0), type);
- tree arg1 = get_unwidened (TREE_OPERAND (expr, 1), type);
-
- /* Don't distribute unless the output precision is at least as big
- as the actual inputs. Otherwise, the comparison of the
- truncated values will be wrong. */
- if (outprec >= TYPE_PRECISION (TREE_TYPE (arg0))
- && outprec >= TYPE_PRECISION (TREE_TYPE (arg1))
- /* If signedness of arg0 and arg1 don't match,
- we can't necessarily find a type to compare them in. */
- && (TYPE_UNSIGNED (TREE_TYPE (arg0))
- == TYPE_UNSIGNED (TREE_TYPE (arg1))))
+ case RSHIFT_EXPR:
+ /* We can pass truncation down through right shifting
+ when the shift count is a nonpositive constant. */
+ if (TREE_CODE (TREE_OPERAND (expr, 1)) == INTEGER_CST
+ && tree_int_cst_sgn (TREE_OPERAND (expr, 1)) <= 0)
goto trunc1;
break;
- }
- case PLUS_EXPR:
- case MINUS_EXPR:
- case BIT_AND_EXPR:
- case BIT_IOR_EXPR:
- case BIT_XOR_EXPR:
- trunc1:
- {
- tree arg0 = get_unwidened (TREE_OPERAND (expr, 0), type);
- tree arg1 = get_unwidened (TREE_OPERAND (expr, 1), type);
-
- if (outprec >= BITS_PER_WORD
- || TRULY_NOOP_TRUNCATION (outprec, inprec)
- || inprec > TYPE_PRECISION (TREE_TYPE (arg0))
- || inprec > TYPE_PRECISION (TREE_TYPE (arg1)))
+ case LSHIFT_EXPR:
+ /* We can pass truncation down through left shifting
+ when the shift count is a nonnegative constant and
+ the target type is unsigned. */
+ if (TREE_CODE (TREE_OPERAND (expr, 1)) == INTEGER_CST
+ && tree_int_cst_sgn (TREE_OPERAND (expr, 1)) >= 0
+ && TYPE_UNSIGNED (type)
+ && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST)
{
- /* Do the arithmetic in type TYPEX,
- then convert result to TYPE. */
- tree typex = type;
-
- /* Can't do arithmetic in enumeral types
- so use an integer type that will hold the values. */
- if (TREE_CODE (typex) == ENUMERAL_TYPE)
- typex = lang_hooks.types.type_for_size
- (TYPE_PRECISION (typex), TYPE_UNSIGNED (typex));
-
- /* But now perhaps TYPEX is as wide as INPREC.
- In that case, do nothing special here.
- (Otherwise would recurse infinitely in convert. */
- if (TYPE_PRECISION (typex) != inprec)
+ /* If shift count is less than the width of the truncated type,
+ really shift. */
+ if (tree_int_cst_lt (TREE_OPERAND (expr, 1), TYPE_SIZE (type)))
+ /* In this case, shifting is like multiplication. */
+ goto trunc1;
+ else
{
- /* Don't do unsigned arithmetic where signed was wanted,
- or vice versa.
- Exception: if both of the original operands were
- unsigned then we can safely do the work as unsigned.
- Exception: shift operations take their type solely
- from the first argument.
- Exception: the LSHIFT_EXPR case above requires that
- we perform this operation unsigned lest we produce
- signed-overflow undefinedness.
- And we may need to do it as unsigned
- if we truncate to the original size. */
- if (TYPE_UNSIGNED (TREE_TYPE (expr))
- || (TYPE_UNSIGNED (TREE_TYPE (arg0))
- && (TYPE_UNSIGNED (TREE_TYPE (arg1))
- || ex_form == LSHIFT_EXPR
- || ex_form == RSHIFT_EXPR
- || ex_form == LROTATE_EXPR
- || ex_form == RROTATE_EXPR))
- || ex_form == LSHIFT_EXPR
- /* If we have !flag_wrapv, and either ARG0 or
- ARG1 is of a signed type, we have to do
- PLUS_EXPR or MINUS_EXPR in an unsigned
- type. Otherwise, we would introduce
- signed-overflow undefinedness. */
- || ((!TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg0))
- || !TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg1)))
- && (ex_form == PLUS_EXPR
- || ex_form == MINUS_EXPR)))
- typex = unsigned_type_for (typex);
+ /* If it is >= that width, result is zero.
+ Handling this with trunc1 would give the wrong result:
+ (int) ((long long) a << 32) is well defined (as 0)
+ but (int) a << 32 is undefined and would get a
+ warning. */
+
+ tree t = build_int_cst (type, 0);
+
+ /* If the original expression had side-effects, we must
+ preserve it. */
+ if (TREE_SIDE_EFFECTS (expr))
+ return build2 (COMPOUND_EXPR, type, expr, t);
else
- typex = signed_type_for (typex);
- return convert (type,
- fold_build2 (ex_form, typex,
- convert (typex, arg0),
- convert (typex, arg1)));
+ return t;
}
}
- }
- break;
+ break;
- case NEGATE_EXPR:
- case BIT_NOT_EXPR:
- /* This is not correct for ABS_EXPR,
- since we must test the sign before truncation. */
- {
- tree typex;
-
- /* Don't do unsigned arithmetic where signed was wanted,
- or vice versa. */
- if (TYPE_UNSIGNED (TREE_TYPE (expr)))
- typex = unsigned_type_for (type);
- else
- typex = signed_type_for (type);
- return convert (type,
- fold_build1 (ex_form, typex,
- convert (typex,
- TREE_OPERAND (expr, 0))));
- }
+ case TRUNC_DIV_EXPR:
+ {
+ tree arg0 = get_unwidened (TREE_OPERAND (expr, 0), NULL_TREE);
+ tree arg1 = get_unwidened (TREE_OPERAND (expr, 1), NULL_TREE);
+
+ /* Don't distribute unless the output precision is at least as
+ big as the actual inputs and it has the same signedness. */
+ if (outprec >= TYPE_PRECISION (TREE_TYPE (arg0))
+ && outprec >= TYPE_PRECISION (TREE_TYPE (arg1))
+ /* If signedness of arg0 and arg1 don't match,
+ we can't necessarily find a type to compare them in. */
+ && (TYPE_UNSIGNED (TREE_TYPE (arg0))
+ == TYPE_UNSIGNED (TREE_TYPE (arg1)))
+ /* Do not change the sign of the division. */
+ && (TYPE_UNSIGNED (TREE_TYPE (expr))
+ == TYPE_UNSIGNED (TREE_TYPE (arg0)))
+ /* Either require unsigned division or a division by
+ a constant that is not -1. */
+ && (TYPE_UNSIGNED (TREE_TYPE (arg0))
+ || (TREE_CODE (arg1) == INTEGER_CST
+ && !integer_all_onesp (arg1))))
+ {
+ tree tem = do_narrow (loc, ex_form, type, arg0, arg1,
+ expr, inprec, outprec, dofold);
+ if (tem)
+ return tem;
+ }
+ break;
+ }
- case NOP_EXPR:
- /* Don't introduce a
- "can't convert between vector values of different size" error. */
- if (TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == VECTOR_TYPE
- && (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (TREE_OPERAND (expr, 0))))
- != GET_MODE_SIZE (TYPE_MODE (type))))
+ case MAX_EXPR:
+ case MIN_EXPR:
+ case MULT_EXPR:
+ {
+ tree arg0 = get_unwidened (TREE_OPERAND (expr, 0), type);
+ tree arg1 = get_unwidened (TREE_OPERAND (expr, 1), type);
+
+ /* Don't distribute unless the output precision is at least as
+ big as the actual inputs. Otherwise, the comparison of the
+ truncated values will be wrong. */
+ if (outprec >= TYPE_PRECISION (TREE_TYPE (arg0))
+ && outprec >= TYPE_PRECISION (TREE_TYPE (arg1))
+ /* If signedness of arg0 and arg1 don't match,
+ we can't necessarily find a type to compare them in. */
+ && (TYPE_UNSIGNED (TREE_TYPE (arg0))
+ == TYPE_UNSIGNED (TREE_TYPE (arg1))))
+ goto trunc1;
+ break;
+ }
+
+ case PLUS_EXPR:
+ case MINUS_EXPR:
+ case BIT_AND_EXPR:
+ case BIT_IOR_EXPR:
+ case BIT_XOR_EXPR:
+ trunc1:
+ {
+ tree arg0 = get_unwidened (TREE_OPERAND (expr, 0), type);
+ tree arg1 = get_unwidened (TREE_OPERAND (expr, 1), type);
+
+ /* Do not try to narrow operands of pointer subtraction;
+ that will interfere with other folding. */
+ if (ex_form == MINUS_EXPR
+ && CONVERT_EXPR_P (arg0)
+ && CONVERT_EXPR_P (arg1)
+ && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (arg0, 0)))
+ && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (arg1, 0))))
+ break;
+
+ if (outprec >= BITS_PER_WORD
+ || targetm.truly_noop_truncation (outprec, inprec)
+ || inprec > TYPE_PRECISION (TREE_TYPE (arg0))
+ || inprec > TYPE_PRECISION (TREE_TYPE (arg1)))
+ {
+ tree tem = do_narrow (loc, ex_form, type, arg0, arg1,
+ expr, inprec, outprec, dofold);
+ if (tem)
+ return tem;
+ }
+ }
break;
- /* If truncating after truncating, might as well do all at once.
- If truncating after extending, we may get rid of wasted work. */
- return convert (type, get_unwidened (TREE_OPERAND (expr, 0), type));
- case COND_EXPR:
- /* It is sometimes worthwhile to push the narrowing down through
- the conditional and never loses. */
- return fold_build3 (COND_EXPR, type, TREE_OPERAND (expr, 0),
- convert (type, TREE_OPERAND (expr, 1)),
- convert (type, TREE_OPERAND (expr, 2)));
+ case NEGATE_EXPR:
+ /* Using unsigned arithmetic for signed types may hide overflow
+ bugs. */
+ if (!TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (expr, 0)))
+ && sanitize_flags_p (SANITIZE_SI_OVERFLOW))
+ break;
+ /* Fall through. */
+ case BIT_NOT_EXPR:
+ /* This is not correct for ABS_EXPR,
+ since we must test the sign before truncation. */
+ {
+ /* Do the arithmetic in type TYPEX,
+ then convert result to TYPE. */
+ tree typex = type;
+
+ /* Can't do arithmetic in enumeral types
+ so use an integer type that will hold the values. */
+ if (TREE_CODE (typex) == ENUMERAL_TYPE)
+ typex
+ = lang_hooks.types.type_for_size (TYPE_PRECISION (typex),
+ TYPE_UNSIGNED (typex));
+
+ if (!TYPE_UNSIGNED (typex))
+ typex = unsigned_type_for (typex);
+ return convert (type,
+ fold_build1 (ex_form, typex,
+ convert (typex,
+ TREE_OPERAND (expr, 0))));
+ }
- default:
- break;
- }
+ CASE_CONVERT:
+ {
+ tree argtype = TREE_TYPE (TREE_OPERAND (expr, 0));
+ /* Don't introduce a "can't convert between vector values
+ of different size" error. */
+ if (TREE_CODE (argtype) == VECTOR_TYPE
+ && maybe_ne (GET_MODE_SIZE (TYPE_MODE (argtype)),
+ GET_MODE_SIZE (TYPE_MODE (type))))
+ break;
+ }
+ /* If truncating after truncating, might as well do all at once.
+ If truncating after extending, we may get rid of wasted work. */
+ return convert (type, get_unwidened (TREE_OPERAND (expr, 0), type));
+
+ case COND_EXPR:
+ /* It is sometimes worthwhile to push the narrowing down through
+ the conditional and never loses. A COND_EXPR may have a throw
+ as one operand, which then has void type. Just leave void
+ operands as they are. */
+ return
+ fold_build3 (COND_EXPR, type, TREE_OPERAND (expr, 0),
+ VOID_TYPE_P (TREE_TYPE (TREE_OPERAND (expr, 1)))
+ ? TREE_OPERAND (expr, 1)
+ : convert (type, TREE_OPERAND (expr, 1)),
+ VOID_TYPE_P (TREE_TYPE (TREE_OPERAND (expr, 2)))
+ ? TREE_OPERAND (expr, 2)
+ : convert (type, TREE_OPERAND (expr, 2)));
+
+ default:
+ break;
+ }
+ /* When parsing long initializers, we might end up with a lot of casts.
+ Shortcut this. */
+ if (TREE_CODE (expr) == INTEGER_CST)
+ return fold_convert (type, expr);
return build1 (CONVERT_EXPR, type, expr);
case REAL_TYPE:
- return build1 (FIX_TRUNC_EXPR, type, expr);
+ if (sanitize_flags_p (SANITIZE_FLOAT_CAST)
+ && current_function_decl != NULL_TREE)
+ {
+ expr = save_expr (expr);
+ tree check = ubsan_instrument_float_cast (loc, type, expr);
+ expr = build1 (FIX_TRUNC_EXPR, type, expr);
+ if (check == NULL_TREE)
+ return expr;
+ return maybe_fold_build2_loc (dofold, loc, COMPOUND_EXPR,
+ TREE_TYPE (expr), check, expr);
+ }
+ else
+ return build1 (FIX_TRUNC_EXPR, type, expr);
+
+ case FIXED_POINT_TYPE:
+ return build1 (FIXED_CONVERT_EXPR, type, expr);
case COMPLEX_TYPE:
- return convert (type,
- fold_build1 (REALPART_EXPR,
- TREE_TYPE (TREE_TYPE (expr)), expr));
+ expr = maybe_fold_build1_loc (dofold, loc, REALPART_EXPR,
+ TREE_TYPE (TREE_TYPE (expr)), expr);
+ return convert (type, expr);
case VECTOR_TYPE:
if (!tree_int_cst_equal (TYPE_SIZE (type), TYPE_SIZE (TREE_TYPE (expr))))
{
- error ("can't convert between vector values of different size");
+ error ("can%'t convert a vector of type %qT"
+ " to type %qT which has different size",
+ TREE_TYPE (expr), type);
return error_mark_node;
}
return build1 (VIEW_CONVERT_EXPR, type, expr);
}
}
-/* Convert EXPR to the complex type TYPE in the usual ways. */
+/* Convert EXPR to some integer (or enum) type TYPE.
+
+ EXPR must be pointer, integer, discrete (enum, char, or bool), float,
+ fixed-point or vector; in other cases error is called.
+
+ The result of this is always supposed to be a newly created tree node
+ not in use in any existing structure. */
tree
-convert_to_complex (tree type, tree expr)
+convert_to_integer (tree type, tree expr)
+{
+ return convert_to_integer_1 (type, expr, true);
+}
+
+/* A wrapper around convert_to_complex_1 that only folds the
+ expression if DOFOLD, or if it is CONSTANT_CLASS_P. */
+
+tree
+convert_to_integer_maybe_fold (tree type, tree expr, bool dofold)
+{
+ return convert_to_integer_1 (type, expr, dofold || CONSTANT_CLASS_P (expr));
+}
+
+/* Convert EXPR to the complex type TYPE in the usual ways. If FOLD_P is
+ true, try to fold the expression. */
+
+static tree
+convert_to_complex_1 (tree type, tree expr, bool fold_p)
{
+ location_t loc = EXPR_LOCATION (expr);
tree subtype = TREE_TYPE (type);
switch (TREE_CODE (TREE_TYPE (expr)))
{
case REAL_TYPE:
+ case FIXED_POINT_TYPE:
case INTEGER_TYPE:
case ENUMERAL_TYPE:
case BOOLEAN_TYPE:
if (TYPE_MAIN_VARIANT (elt_type) == TYPE_MAIN_VARIANT (subtype))
return expr;
+ else if (TREE_CODE (expr) == COMPOUND_EXPR)
+ {
+ tree t = convert_to_complex_1 (type, TREE_OPERAND (expr, 1),
+ fold_p);
+ if (t == TREE_OPERAND (expr, 1))
+ return expr;
+ return build2_loc (EXPR_LOCATION (expr), COMPOUND_EXPR,
+ TREE_TYPE (t), TREE_OPERAND (expr, 0), t);
+ }
else if (TREE_CODE (expr) == COMPLEX_EXPR)
- return fold_build2 (COMPLEX_EXPR, type,
- convert (subtype, TREE_OPERAND (expr, 0)),
- convert (subtype, TREE_OPERAND (expr, 1)));
+ return maybe_fold_build2_loc (fold_p, loc, COMPLEX_EXPR, type,
+ convert (subtype,
+ TREE_OPERAND (expr, 0)),
+ convert (subtype,
+ TREE_OPERAND (expr, 1)));
else
{
expr = save_expr (expr);
- return
- fold_build2 (COMPLEX_EXPR, type,
- convert (subtype,
- fold_build1 (REALPART_EXPR,
- TREE_TYPE (TREE_TYPE (expr)),
- expr)),
- convert (subtype,
- fold_build1 (IMAGPART_EXPR,
- TREE_TYPE (TREE_TYPE (expr)),
- expr)));
+ tree realp = maybe_fold_build1_loc (fold_p, loc, REALPART_EXPR,
+ TREE_TYPE (TREE_TYPE (expr)),
+ expr);
+ tree imagp = maybe_fold_build1_loc (fold_p, loc, IMAGPART_EXPR,
+ TREE_TYPE (TREE_TYPE (expr)),
+ expr);
+ return maybe_fold_build2_loc (fold_p, loc, COMPLEX_EXPR, type,
+ convert (subtype, realp),
+ convert (subtype, imagp));
}
}
case POINTER_TYPE:
case REFERENCE_TYPE:
error ("pointer value used where a complex was expected");
- return convert_to_complex (type, integer_zero_node);
+ return convert_to_complex_1 (type, integer_zero_node, fold_p);
default:
error ("aggregate value used where a complex was expected");
- return convert_to_complex (type, integer_zero_node);
+ return convert_to_complex_1 (type, integer_zero_node, fold_p);
}
}
+/* A wrapper around convert_to_complex_1 that always folds the
+ expression. */
+
+tree
+convert_to_complex (tree type, tree expr)
+{
+ return convert_to_complex_1 (type, expr, true);
+}
+
+/* A wrapper around convert_to_complex_1 that only folds the
+ expression if DOFOLD, or if it is CONSTANT_CLASS_P. */
+
+tree
+convert_to_complex_maybe_fold (tree type, tree expr, bool dofold)
+{
+ return convert_to_complex_1 (type, expr, dofold || CONSTANT_CLASS_P (expr));
+}
+
/* Convert EXPR to the vector type TYPE in the usual ways. */
tree
case VECTOR_TYPE:
if (!tree_int_cst_equal (TYPE_SIZE (type), TYPE_SIZE (TREE_TYPE (expr))))
{
- error ("can't convert between vector values of different size");
+ error ("can%'t convert a value of type %qT"
+ " to vector type %qT which has different size",
+ TREE_TYPE (expr), type);
return error_mark_node;
}
return build1 (VIEW_CONVERT_EXPR, type, expr);
default:
- error ("can't convert value to a vector");
+ error ("can%'t convert value to a vector");
+ return error_mark_node;
+ }
+}
+
+/* Convert EXPR to some fixed-point type TYPE.
+
+ EXPR must be fixed-point, float, integer, or enumeral;
+ in other cases error is called. */
+
+tree
+convert_to_fixed (tree type, tree expr)
+{
+ if (integer_zerop (expr))
+ {
+ tree fixed_zero_node = build_fixed (type, FCONST0 (TYPE_MODE (type)));
+ return fixed_zero_node;
+ }
+ else if (integer_onep (expr) && ALL_SCALAR_ACCUM_MODE_P (TYPE_MODE (type)))
+ {
+ tree fixed_one_node = build_fixed (type, FCONST1 (TYPE_MODE (type)));
+ return fixed_one_node;
+ }
+
+ switch (TREE_CODE (TREE_TYPE (expr)))
+ {
+ case FIXED_POINT_TYPE:
+ case INTEGER_TYPE:
+ case ENUMERAL_TYPE:
+ case BOOLEAN_TYPE:
+ case REAL_TYPE:
+ return build1 (FIXED_CONVERT_EXPR, type, expr);
+
+ case COMPLEX_TYPE:
+ return convert (type,
+ fold_build1 (REALPART_EXPR,
+ TREE_TYPE (TREE_TYPE (expr)), expr));
+
+ default:
+ error ("aggregate value used where a fixed-point was expected");
return error_mark_node;
}
}