This fixes PR50494 by avoiding to increase alignment of decls
that are in the constant pool by the vectorizer.
Bootstrap & regtest pending on powerpc64-linux-gnu, with
the older fix reverted.
Richard.
2013-03-05 Richard Biener <rguent...@suse.de>
PR middle-end/50494
* tree-vect-data-refs.c (vect_can_force_dr_alignment_p):
Do not adjust alignment of DECL_IN_CONSTANT_POOL decls.
Index: gcc/tree-vect-data-refs.c
===================================================================
--- gcc/tree-vect-data-refs.c (revision 196466)
+++ gcc/tree-vect-data-refs.c (working copy)
@@ -4829,9 +4829,12 @@ vect_can_force_dr_alignment_p (const_tre
/* We cannot change alignment of common or external symbols as another
translation unit may contain a definition with lower alignment.
The rules of common symbol linking mean that the definition
- will override the common symbol. */
+ will override the common symbol. The same is true for constant
+ pool entries which may be shared and are not properly merged
+ by LTO. */
if (DECL_EXTERNAL (decl)
- || DECL_COMMON (decl))
+ || DECL_COMMON (decl)
+ || DECL_IN_CONSTANT_POOL (decl))
return false;
if (TREE_ASM_WRITTEN (decl))
