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re PR tree-optimization/19831 (Missing DSE/malloc/free optimization)

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2013-10-29  Marc Glisse  <marc.glisse@inria.fr>

	PR tree-optimization/19831
gcc/
	* tree-ssa-alias.c (stmt_kills_ref_p_1): Handle BUILT_IN_FREE.

gcc/testsuite/
	* gcc.dg/tree-ssa/alias-25.c: New file.

From-SVN: r204160
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Marc Glisse 2013-10-29 14:19:08 +01:00 • committed by Marc Glisse
parent eda14d6a85
commit 4879f42a07
4 changed files with 32 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2013-10-29 Marc Glisse <marc.glisse@inria.fr>
PR tree-optimization/19831
* tree-ssa-alias.c (stmt_kills_ref_p_1): Handle BUILT_IN_FREE.
2013-10-29 Andrew MacLeod <amacleod@redhat.com>
* tree-outof-ssa.h: Remove include files.

5
gcc/testsuite/ChangeLog
View file

@ -1,3 +1,8 @@
2013-10-29 Marc Glisse <marc.glisse@inria.fr>
PR tree-optimization/19831
* gcc.dg/tree-ssa/alias-25.c: New file.
2013-10-29 Richard Biener <rguenther@suse.de>
* g++.dg/vect/slp-pr56812.cc: Adjust with respect to -fvect-cost-model

12
gcc/testsuite/gcc.dg/tree-ssa/alias-25.c Normal file
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@ -0,0 +1,12 @@
/* { dg-do compile } */
/* { dg-options "-O1 -fdump-tree-optimized" } */
void f (long *p) {
*p = 42;
p[4] = 42;
__builtin_free (p);
}
/* { dg-final { scan-tree-dump-not "= 42" "optimized" } } */
/* { dg-final { cleanup-tree-dump "optimized" } } */

10
gcc/tree-ssa-alias.c
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@ -2057,6 +2057,16 @@ stmt_kills_ref_p_1 (gimple stmt, ao_ref *ref)
&& DECL_BUILT_IN_CLASS (callee) == BUILT_IN_NORMAL)
switch (DECL_FUNCTION_CODE (callee))
{
case BUILT_IN_FREE:
{
tree ptr = gimple_call_arg (stmt, 0);
tree base = ao_ref_base (ref);
if (base && TREE_CODE (base) == MEM_REF
&& TREE_OPERAND (base, 0) == ptr)
return true;
break;
}
case BUILT_IN_MEMCPY:
case BUILT_IN_MEMPCPY:
case BUILT_IN_MEMMOVE: