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re PR rtl-optimization/45678 (crash on vector code with -m32 -msse)

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2010-09-17  Richard Guenther  <rguenther@suse.de>

	PR middle-end/45678
	* builtins.c (fold_builtin_memory_op): Always properly adjust
	alignment of memory accesses.

From-SVN: r164356
This commit is contained in:
Richard Guenther 2010-09-17 09:00:23 +00:00 committed by Richard Biener
parent 52b3b3c7e2
commit dbad82f59c
2 changed files with 41 additions and 14 deletions

6
gcc/ChangeLog

@ -1,3 +1,9 @@
2010-09-17 Richard Guenther <rguenther@suse.de>
PR middle-end/45678
* builtins.c (fold_builtin_memory_op): Always properly adjust
alignment of memory accesses.
2010-09-16 Jan Hubicka <jh@suse.cz>
* lto-cgraph.c (input_overwrite_node): Do not set DECL_EXTERNAL when

49
gcc/builtins.c

@ -8555,12 +8555,21 @@ fold_builtin_memory_op (location_t loc, tree dest, tree src,
STRIP_NOPS (srcvar);
if (TREE_CODE (srcvar) == ADDR_EXPR
&& var_decl_component_p (TREE_OPERAND (srcvar, 0))
&& tree_int_cst_equal (TYPE_SIZE_UNIT (srctype), len)
&& (!STRICT_ALIGNMENT
|| !destvar
|| src_align >= TYPE_ALIGN (desttype)))
srcvar = fold_build2 (MEM_REF, destvar ? desttype : srctype,
srcvar, off0);
&& tree_int_cst_equal (TYPE_SIZE_UNIT (srctype), len))
{
if (!destvar
|| src_align >= TYPE_ALIGN (desttype))
srcvar = fold_build2 (MEM_REF, destvar ? desttype : srctype,
srcvar, off0);
else if (!STRICT_ALIGNMENT)
{
srctype = build_aligned_type (TYPE_MAIN_VARIANT (desttype),
src_align);
srcvar = fold_build2 (MEM_REF, srctype, srcvar, off0);
}
else
srcvar = NULL_TREE;
}
else
srcvar = NULL_TREE;
@ -8569,19 +8578,31 @@ fold_builtin_memory_op (location_t loc, tree dest, tree src,
if (srcvar == NULL_TREE)
{
if (STRICT_ALIGNMENT
&& src_align < TYPE_ALIGN (desttype))
return NULL_TREE;
STRIP_NOPS (src);
srcvar = fold_build2 (MEM_REF, desttype, src, off0);
if (src_align >= TYPE_ALIGN (desttype))
srcvar = fold_build2 (MEM_REF, desttype, src, off0);
else
{
if (STRICT_ALIGNMENT)
return NULL_TREE;
srctype = build_aligned_type (TYPE_MAIN_VARIANT (desttype),
src_align);
srcvar = fold_build2 (MEM_REF, srctype, src, off0);
}
}
else if (destvar == NULL_TREE)
{
if (STRICT_ALIGNMENT
&& dest_align < TYPE_ALIGN (srctype))
return NULL_TREE;
STRIP_NOPS (dest);
destvar = fold_build2 (MEM_REF, srctype, dest, off0);
if (dest_align >= TYPE_ALIGN (srctype))
destvar = fold_build2 (MEM_REF, srctype, dest, off0);
else
{
if (STRICT_ALIGNMENT)
return NULL_TREE;
desttype = build_aligned_type (TYPE_MAIN_VARIANT (srctype),
dest_align);
destvar = fold_build2 (MEM_REF, desttype, dest, off0);
}
}
expr = build2 (MODIFY_EXPR, TREE_TYPE (destvar), destvar, srcvar);