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re PR tree-optimization/50472 (Volatile qualification in data is not enough to avoid optimization over pointer to data) 

2011-09-26  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/50472
	* gimple-fold.c (fold_const_aggregate_ref_1): Do not fold
	volatile references.

	* gcc.dg/torture/pr50472.c: New testcase.

From-SVN: r179196
This commit is contained in:
Richard Guenther 2011-09-26 12:58:35 +00:00 committed by Richard Biener
parent b5bcaa4a74
commit f8a7df4594
4 changed files with 27 additions and 0 deletions
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7
gcc/ChangeLog
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@ -1,4 +1,11 @@
2011-09-26 Richard Guenther <rguenther@suse.de>
PR tree-optimization/50472
* gimple-fold.c (fold_const_aggregate_ref_1): Do not fold
volatile references.
2011-09-26 Bingfeng Mei <bmei@broadcom.com>
* doc/tm.texi: Correct documentation for TARGET_ADDR_SPACE_SUBSET_P.
* target.def: (addr_space_subset_p): Likewise.

3
gcc/gimple-fold.c
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@ -2919,6 +2919,9 @@ fold_const_aggregate_ref_1 (tree t, tree (*valueize) (tree))
HOST_WIDE_INT offset, size, max_size;
tree tem;
if (TREE_THIS_VOLATILE (t))
return NULL_TREE;
if (TREE_CODE_CLASS (TREE_CODE (t)) == tcc_declaration)
return get_symbol_constant_value (t);

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2011-09-26 Richard Guenther <rguenther@suse.de>
PR tree-optimization/50472
* gcc.dg/torture/pr50472.c: New testcase.
2011-09-26 Eric Botcazou <ebotcazou@adacore.com>
* gnat.dg/opt22.adb: New test.

12
gcc/testsuite/gcc.dg/torture/pr50472.c Normal file
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@ -0,0 +1,12 @@
/* { dg-do compile } */
/* { dg-options "-fdump-tree-optimized" } */
static const unsigned int foo = 1;
unsigned int test( void )
{
const volatile unsigned int *bar = &foo;
return ( *bar );
}
/* { dg-final { scan-tree-dump-not "return 1" "optimized" } } */
/* { dg-final { cleanup-tree-dump "optimized" } } */