#include "stor-layout.h"
#include "flags.h"
#include "tm_p.h"
+#include "predict.h"
+#include "vec.h"
+#include "hashtab.h"
+#include "hash-set.h"
+#include "machmode.h"
+#include "hard-reg-set.h"
+#include "input.h"
+#include "function.h"
+#include "dominance.h"
+#include "cfg.h"
+#include "cfganal.h"
#include "basic-block.h"
#include "cfgloop.h"
-#include "function.h"
+#include "inchash.h"
#include "gimple-pretty-print.h"
#include "tree-ssa-alias.h"
#include "internal-fn.h"
#include "params.h"
#include "tree-ssa-threadedge.h"
#include "tree-ssa-dom.h"
+#include "inchash.h"
/* This file implements optimizations on the dominator tree. */
case GIMPLE_UNARY_RHS:
expr->kind = EXPR_UNARY;
expr->type = TREE_TYPE (gimple_assign_lhs (stmt));
+ if (CONVERT_EXPR_CODE_P (subcode))
+ subcode = NOP_EXPR;
expr->ops.unary.op = subcode;
expr->ops.unary.opnd = gimple_assign_rhs1 (stmt);
break;
}
/* Generate a hash value for a pair of expressions. This can be used
- iteratively by passing a previous result as the VAL argument.
+ iteratively by passing a previous result in HSTATE.
The same hash value is always returned for a given pair of expressions,
regardless of the order in which they are presented. This is useful in
hashing the operands of commutative functions. */
-static hashval_t
-iterative_hash_exprs_commutative (const_tree t1,
- const_tree t2, hashval_t val)
+namespace inchash
{
- hashval_t one = iterative_hash_expr (t1, 0);
- hashval_t two = iterative_hash_expr (t2, 0);
- hashval_t t;
- if (one > two)
- t = one, one = two, two = t;
- val = iterative_hash_hashval_t (one, val);
- val = iterative_hash_hashval_t (two, val);
+static void
+add_expr_commutative (const_tree t1, const_tree t2, hash &hstate)
+{
+ hash one, two;
- return val;
+ inchash::add_expr (t1, one);
+ inchash::add_expr (t2, two);
+ hstate.add_commutative (one, two);
}
/* Compute a hash value for a hashable_expr value EXPR and a
previously accumulated hash value VAL. If two hashable_expr
values compare equal with hashable_expr_equal_p, they must
hash to the same value, given an identical value of VAL.
- The logic is intended to follow iterative_hash_expr in tree.c. */
+ The logic is intended to follow inchash::add_expr in tree.c. */
-static hashval_t
-iterative_hash_hashable_expr (const struct hashable_expr *expr, hashval_t val)
+static void
+add_hashable_expr (const struct hashable_expr *expr, hash &hstate)
{
switch (expr->kind)
{
case EXPR_SINGLE:
- val = iterative_hash_expr (expr->ops.single.rhs, val);
+ inchash::add_expr (expr->ops.single.rhs, hstate);
break;
case EXPR_UNARY:
- val = iterative_hash_object (expr->ops.unary.op, val);
+ hstate.add_object (expr->ops.unary.op);
/* Make sure to include signedness in the hash computation.
Don't hash the type, that can lead to having nodes which
have different hash codes. */
if (CONVERT_EXPR_CODE_P (expr->ops.unary.op)
|| expr->ops.unary.op == NON_LVALUE_EXPR)
- val += TYPE_UNSIGNED (expr->type);
+ hstate.add_int (TYPE_UNSIGNED (expr->type));
- val = iterative_hash_expr (expr->ops.unary.opnd, val);
+ inchash::add_expr (expr->ops.unary.opnd, hstate);
break;
case EXPR_BINARY:
- val = iterative_hash_object (expr->ops.binary.op, val);
+ hstate.add_object (expr->ops.binary.op);
if (commutative_tree_code (expr->ops.binary.op))
- val = iterative_hash_exprs_commutative (expr->ops.binary.opnd0,
- expr->ops.binary.opnd1, val);
+ inchash::add_expr_commutative (expr->ops.binary.opnd0,
+ expr->ops.binary.opnd1, hstate);
else
{
- val = iterative_hash_expr (expr->ops.binary.opnd0, val);
- val = iterative_hash_expr (expr->ops.binary.opnd1, val);
+ inchash::add_expr (expr->ops.binary.opnd0, hstate);
+ inchash::add_expr (expr->ops.binary.opnd1, hstate);
}
break;
case EXPR_TERNARY:
- val = iterative_hash_object (expr->ops.ternary.op, val);
+ hstate.add_object (expr->ops.ternary.op);
if (commutative_ternary_tree_code (expr->ops.ternary.op))
- val = iterative_hash_exprs_commutative (expr->ops.ternary.opnd0,
- expr->ops.ternary.opnd1, val);
+ inchash::add_expr_commutative (expr->ops.ternary.opnd0,
+ expr->ops.ternary.opnd1, hstate);
else
{
- val = iterative_hash_expr (expr->ops.ternary.opnd0, val);
- val = iterative_hash_expr (expr->ops.ternary.opnd1, val);
+ inchash::add_expr (expr->ops.ternary.opnd0, hstate);
+ inchash::add_expr (expr->ops.ternary.opnd1, hstate);
}
- val = iterative_hash_expr (expr->ops.ternary.opnd2, val);
+ inchash::add_expr (expr->ops.ternary.opnd2, hstate);
break;
case EXPR_CALL:
enum tree_code code = CALL_EXPR;
gimple fn_from;
- val = iterative_hash_object (code, val);
+ hstate.add_object (code);
fn_from = expr->ops.call.fn_from;
if (gimple_call_internal_p (fn_from))
- val = iterative_hash_hashval_t
- ((hashval_t) gimple_call_internal_fn (fn_from), val);
+ hstate.merge_hash ((hashval_t) gimple_call_internal_fn (fn_from));
else
- val = iterative_hash_expr (gimple_call_fn (fn_from), val);
+ inchash::add_expr (gimple_call_fn (fn_from), hstate);
for (i = 0; i < expr->ops.call.nargs; i++)
- val = iterative_hash_expr (expr->ops.call.args[i], val);
+ inchash::add_expr (expr->ops.call.args[i], hstate);
}
break;
size_t i;
for (i = 0; i < expr->ops.phi.nargs; i++)
- val = iterative_hash_expr (expr->ops.phi.args[i], val);
+ inchash::add_expr (expr->ops.phi.args[i], hstate);
}
break;
default:
gcc_unreachable ();
}
+}
- return val;
}
/* Print a diagnostic dump of an expression hash table entry. */
record_const_or_copy_1 (x, y, prev_x);
}
+/* Return the loop depth of the basic block of the defining statement of X.
+ This number should not be treated as absolutely correct because the loop
+ information may not be completely up-to-date when dom runs. However, it
+ will be relatively correct, and as more passes are taught to keep loop info
+ up to date, the result will become more and more accurate. */
+
+static int
+loop_depth_of_name (tree x)
+{
+ gimple defstmt;
+ basic_block defbb;
+
+ /* If it's not an SSA_NAME, we have no clue where the definition is. */
+ if (TREE_CODE (x) != SSA_NAME)
+ return 0;
+
+ /* Otherwise return the loop depth of the defining statement's bb.
+ Note that there may not actually be a bb for this statement, if the
+ ssa_name is live on entry. */
+ defstmt = SSA_NAME_DEF_STMT (x);
+ defbb = gimple_bb (defstmt);
+ if (!defbb)
+ return 0;
+
+ return bb_loop_depth (defbb);
+}
+
/* Similarly, but assume that X and Y are the two operands of an EQ_EXPR.
This constrains the cases in which we may treat this as assignment. */
long as we canonicalize on one value. */
if (is_gimple_min_invariant (y))
;
- else if (is_gimple_min_invariant (x))
+ else if (is_gimple_min_invariant (x)
+ /* ??? When threading over backedges the following is important
+ for correctness. See PR61757. */
+ || (loop_depth_of_name (x) <= loop_depth_of_name (y)))
prev_x = x, x = y, y = prev_x, prev_x = prev_y;
else if (prev_x && is_gimple_min_invariant (prev_x))
x = y, y = prev_x, prev_x = prev_y;
gimple stmt = ((const struct expr_hash_elt *)p)->stmt;
const struct hashable_expr *expr = &((const struct expr_hash_elt *)p)->expr;
tree vuse;
- hashval_t val = 0;
+ inchash::hash hstate;
- val = iterative_hash_hashable_expr (expr, val);
+ inchash::add_hashable_expr (expr, hstate);
/* If the hash table entry is not associated with a statement, then we
can just hash the expression and not worry about virtual operands
and such. */
if (!stmt)
- return val;
+ return hstate.end ();
/* Add the SSA version numbers of the vuse operand. This is important
because compound variables like arrays are not renamed in the
operands. Rather, the rename is done on the virtual variable
representing all the elements of the array. */
if ((vuse = gimple_vuse (stmt)))
- val = iterative_hash_expr (vuse, val);
+ inchash::add_expr (vuse, hstate);
- return val;
+ return hstate.end ();
}
/* PHI-ONLY copy and constant propagation. This pass is meant to clean
projects / gcc.git / blobdiff