This fixes PR56434 - the use of BIGGEST_ALIGNMENT to annotate
the pointer returned by malloc is wrong - BIGGEST_ALIGNMENT
has nothing to do with the alignment guaranteed by the ABI
for allocated memory. For example on x86_64 it depends on
-mavx and thus can result in wrong code being generated.
The following patch fixes it to use what we use on the
GIMPLE level - MALLOC_ABI_ALIGNMENT.
Ok for trunk?
Thanks,
Richard.
2013-03-22 Richard Biener <rguent...@suse.de>
PR middle-end/56434
* calls.c (expand_call): Use MALLOC_ABI_ALIGNMENT to annotate
the pointer returned by calls with ECF_MALLOC set.
Index: gcc/calls.c
===================================================================
--- gcc/calls.c (revision 196899)
+++ gcc/calls.c (working copy)
@@ -3186,7 +3186,7 @@ expand_call (tree exp, rtx target, int i
/* The return value from a malloc-like function is a pointer. */
if (TREE_CODE (rettype) == POINTER_TYPE)
- mark_reg_pointer (temp, BIGGEST_ALIGNMENT);
+ mark_reg_pointer (temp, MALLOC_ABI_ALIGNMENT);
emit_move_insn (temp, valreg);
