FreeChainXenon/gcc
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

re PR middle-end/42509 (nonoverlapping_memrefs_p misinterprets NULL MEM_OFFSET as const0_rtx)

Browse source 
2010-04-03  Richard Guenther  <rguenther@suse.de>

	PR middle-end/42509
	* alias.c (nonoverlapping_memrefs_p): For spill-slot accesses
	require a non-NULL MEM_OFFSET.

From-SVN: r157954
This commit is contained in:
Richard Guenther 2010-04-03 17:14:44 +00:00 • committed by Richard Biener
parent 058ad7c406
commit 2b22e3825d
2 changed files with 13 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
gcc/ChangeLog
View file

@ -1,3 +1,9 @@
2010-04-03 Richard Guenther <rguenther@suse.de>
PR middle-end/42509
* alias.c (nonoverlapping_memrefs_p): For spill-slot accesses
require a non-NULL MEM_OFFSET.
2010-04-02 Steven Bosscher <steven@gcc.gnu.org>
* ada/gcc-interface/Make-lang.in, alias.c, attribs.c, auto-inc-dec.c,

7
gcc/alias.c
View file

@ -2147,6 +2147,13 @@ nonoverlapping_memrefs_p (const_rtx x, const_rtx y)
if (exprx == 0 || expry == 0)
return 0;
/* For spill-slot accesses make sure we have valid offsets. */
if ((exprx == get_spill_slot_decl (false)
&& ! MEM_OFFSET (x))
|| (expry == get_spill_slot_decl (false)
&& ! MEM_OFFSET (y)))
return 0;
/* If both are field references, we may be able to determine something. */
if (TREE_CODE (exprx) == COMPONENT_REF
&& TREE_CODE (expry) == COMPONENT_REF