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re PR tree-optimization/37991 (excessive memory consumption - possible hang)

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2008-11-02  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/37991
	* tree-ssa-sccvn.h (copy_vuses_from_stmt): Remove.
	* tree-ssa-sccvn.c (copy_vuses_from_stmt): Make static.
	(set_ssa_val_to): Print if the value changed.
	(simplify_binary_expression): Strip useless conversions.

	* gcc.c-torture/compile/pr37991.c: New testcase.

From-SVN: r141532
This commit is contained in:
Richard Guenther 2008-11-02 13:34:58 +00:00 • committed by Richard Biener
parent 99f9aa7b91
commit 8495c94f49
5 changed files with 34 additions and 3 deletions
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8
gcc/ChangeLog
View file

@ -1,3 +1,11 @@
2008-11-02 Richard Guenther <rguenther@suse.de>
PR tree-optimization/37991
* tree-ssa-sccvn.h (copy_vuses_from_stmt): Remove.
* tree-ssa-sccvn.c (copy_vuses_from_stmt): Make static.
(set_ssa_val_to): Print if the value changed.
(simplify_binary_expression): Strip useless conversions.
2008-11-01 Hans-Peter Nilsson <hp@axis.com>
PR target/37939

5
gcc/testsuite/ChangeLog
View file

@ -1,3 +1,8 @@
2008-11-02 Richard Guenther <rguenther@suse.de>
PR tree-optimization/37991
* gcc.c-torture/compile/pr37991.c: New testcase.
2008-11-01 Hans-Peter Nilsson <hp@axis.com>
PR target/37939

14
gcc/testsuite/gcc.c-torture/compile/pr37991.c Normal file
View file

@ -0,0 +1,14 @@
typedef int Int32;
void use_it(int);
void FindAndReadSignature(int processedSize)
{
int numPrevBytes = 1;
for (;;)
{
int numBytesInBuffer = numPrevBytes + processedSize;
Int32 numTests = numBytesInBuffer - 1;
use_it (numTests);
numPrevBytes = numBytesInBuffer - numTests;
}
}

9
gcc/tree-ssa-sccvn.c
View file

@ -498,7 +498,7 @@ vuses_to_vec (gimple stmt, VEC (tree, gc) **result)
/* Copy the VUSE names in STMT into a vector, and return
the vector. */
VEC (tree, gc) *
static VEC (tree, gc) *
copy_vuses_from_stmt (gimple stmt)
{
VEC (tree, gc) *vuses = NULL;
@ -1579,7 +1579,6 @@ set_ssa_val_to (tree from, tree to)
print_generic_expr (dump_file, from, 0);
fprintf (dump_file, " to ");
print_generic_expr (dump_file, to, 0);
fprintf (dump_file, "\n");
}
currval = SSA_VAL (from);
@ -1587,8 +1586,12 @@ set_ssa_val_to (tree from, tree to)
if (currval != to && !operand_equal_p (currval, to, OEP_PURE_SAME))
{
SSA_VAL (from) = to;
if (dump_file && (dump_flags & TDF_DETAILS))
fprintf (dump_file, " (changed)\n");
return true;
}
if (dump_file && (dump_flags & TDF_DETAILS))
fprintf (dump_file, "\n");
return false;
}
@ -2113,6 +2116,8 @@ simplify_binary_expression (gimple stmt)
result = fold_binary (gimple_assign_rhs_code (stmt),
TREE_TYPE (gimple_get_lhs (stmt)), op0, op1);
if (result)
STRIP_USELESS_TYPE_CONVERSION (result);
fold_undefer_overflow_warnings (result && valid_gimple_rhs_p (result),
stmt, 0);

1
gcc/tree-ssa-sccvn.h
View file

@ -196,5 +196,4 @@ unsigned int get_constant_value_id (tree);
unsigned int get_or_alloc_constant_value_id (tree);
bool value_id_constant_p (unsigned int);
VEC (tree, gc) *shared_vuses_from_stmt (gimple);
VEC (tree, gc) *copy_vuses_from_stmt (gimple);
#endif /* TREE_SSA_SCCVN_H */