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re PR tree-optimization/52402 (IPA-SRA creates aligned loads from unaligned memory) 

2012-02-28  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/52402
	* ipa-prop.c (ipa_modify_call_arguments): Properly use
	mis-aligned types when creating the accesses at the call site.

	* gcc.dg/torture/pr52402.c: New testcase.

From-SVN: r184619
This commit is contained in:
Richard Guenther 2012-02-28 09:15:49 +00:00 committed by Richard Biener
parent 9551049787
commit 3a5a825aae
4 changed files with 60 additions and 3 deletions
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6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2012-02-28 Richard Guenther <rguenther@suse.de>
PR tree-optimization/52402
* ipa-prop.c (ipa_modify_call_arguments): Properly use
mis-aligned types when creating the accesses at the call site.
2012-02-28 Georg-Johann Lay <avr@gjlay.de>
* config/avr/builtins.def: New file.

24
gcc/ipa-prop.c
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@ -2508,9 +2508,27 @@ ipa_modify_call_arguments (struct cgraph_edge *cs, gimple stmt,
}
}
expr = fold_build2_loc (loc, MEM_REF, adj->type, base, off);
if (adj->by_ref)
expr = build_fold_addr_expr (expr);
if (!adj->by_ref)
{
tree type = adj->type;
unsigned int align;
unsigned HOST_WIDE_INT misalign;
align = get_pointer_alignment_1 (base, &misalign);
misalign += (double_int_sext (tree_to_double_int (off),
TYPE_PRECISION (TREE_TYPE (off))).low
* BITS_PER_UNIT);
misalign = misalign & (align - 1);
if (misalign != 0)
align = (misalign & -misalign);
if (align < TYPE_ALIGN (type))
type = build_aligned_type (type, align);
expr = fold_build2_loc (loc, MEM_REF, type, base, off);
}
else
{
expr = fold_build2_loc (loc, MEM_REF, adj->type, base, off);
expr = build_fold_addr_expr (expr);
}
expr = force_gimple_operand_gsi (&gsi, expr,
adj->by_ref

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2012-02-28 Richard Guenther <rguenther@suse.de>
PR tree-optimization/52402
* gcc.dg/torture/pr52402.c: New testcase.
2012-02-28 Richard Guenther <rguenther@suse.de>
PR lto/52400

28
gcc/testsuite/gcc.dg/torture/pr52402.c Normal file
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@ -0,0 +1,28 @@
/* { dg-do run } */
typedef int v4si __attribute__((vector_size(16)));
struct T { v4si i[2]; int j; } __attribute__((packed));
static v4si __attribute__((noinline))
foo (struct T t)
{
return t.i[0];
}
static struct T *__attribute__((noinline))
init ()
{
char *p = __builtin_malloc (sizeof (struct T) + 1);
p++;
__builtin_memset (p, 1, sizeof (struct T));
return (struct T *)p;
}
int main()
{
struct T *p;
p = init ();
if (foo (*p)[0] != 0x01010101)
__builtin_abort ();
return 0;
}