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re PR tree-optimization/47391 (read from const volatile incorrectly eliminated) 

PR tree-optimization/47391
	* varpool.c (const_value_known_p): Return false if
	decl is volatile.

	* gcc.dg/pr47391.c: New test.

From-SVN: r169084
This commit is contained in:
Jakub Jelinek 2011-01-21 13:57:52 +01:00 committed by Jakub Jelinek
parent d8debb1d8a
commit 3a2df83199
4 changed files with 33 additions and 2 deletions
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4
gcc/ChangeLog
View File

@ -3,6 +3,10 @@
* tree-ssa-live.c (remove_unused_scope_block_p): Don't remove
DECL_IGNORED_P non-reg vars if they are used.
PR tree-optimization/47391
* varpool.c (const_value_known_p): Return false if
decl is volatile.
2011-01-21 Kai Tietz <kai.tietz@onevision.com>
PR bootstrap/47215

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2011-01-21 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/47391
* gcc.dg/pr47391.c: New test.
2011-01-21 Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
* g++.dg/template/char1.C: Use signed char.

22
gcc/testsuite/gcc.dg/pr47391.c Normal file
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@ -0,0 +1,22 @@
/* PR tree-optimization/47391 */
/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-optimized" } */
const volatile int v = 1;
int i = 0;
void
foo (void)
{
i = v;
}
int
main (void)
{
foo ();
return 0;
}
/* { dg-final { scan-tree-dump-not "i = 1;" "optimized" } } */
/* { dg-final { cleanup-tree-dump "optimized" } } */

4
gcc/varpool.c
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@ -1,5 +1,5 @@
/* Callgraph handling code.
Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2010
Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2010, 2011
Free Software Foundation, Inc.
Contributed by Jan Hubicka
@ -370,7 +370,7 @@ const_value_known_p (tree decl)
gcc_assert (TREE_CODE (decl) == VAR_DECL);
if (!TREE_READONLY (decl))
if (!TREE_READONLY (decl) || TREE_THIS_VOLATILE (decl))
return false;
/* Gimplifier takes away constructors of local vars */