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re PR tree-optimization/80334 (Segfault when taking address of copy of unaligned struct)

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2017-04-06  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/80334
	* tree-ssa-loop-ivopts.c (rewrite_use_address): Properly
	preserve alignment of accesses.

	* g++.dg/torture/pr80334.C: New testcase.

From-SVN: r246731
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Richard Biener 2017-04-06 13:56:35 +00:00 committed by Richard Biener
parent d9f8c5af8b
commit 09b63f67a1
4 changed files with 34 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2017-04-06 Richard Biener <rguenther@suse.de>
PR tree-optimization/80334
* tree-ssa-loop-ivopts.c (rewrite_use_address): Properly
preserve alignment of accesses.
2017-04-06 Richard Biener <rguenther@suse.de>
PR tree-optimization/80262

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2017-04-06 Richard Biener <rguenther@suse.de>
PR tree-optimization/80334
* g++.dg/torture/pr80334.C: New testcase.
2017-04-06 Martin Liska <mliska@suse.cz>
PR sanitizer/80166

18
gcc/testsuite/g++.dg/torture/pr80334.C Normal file
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@ -0,0 +1,18 @@
// { dg-do run }
struct A { alignas(16) char c; };
struct B { A unpacked; char d; } __attribute__((packed));
char x;
int
main()
{
alignas(16) B b[3];
for (int i = 0; i < 3; i++) b[i].unpacked.c = 'a' + i;
for (int i = 0; i < 3; i++)
{
auto a = new A(b[i].unpacked);
x = a->c;
}
}

6
gcc/tree-ssa-loop-ivopts.c
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@ -7396,7 +7396,11 @@ rewrite_use_address (struct ivopts_data *data,
base_hint = var_at_stmt (data->current_loop, cand, use->stmt);
iv = var_at_stmt (data->current_loop, cand, use->stmt);
ref = create_mem_ref (&bsi, TREE_TYPE (*use->op_p), &aff,
tree type = TREE_TYPE (*use->op_p);
unsigned int align = get_object_alignment (*use->op_p);
if (align != TYPE_ALIGN (type))
type = build_aligned_type (type, align);
ref = create_mem_ref (&bsi, type, &aff,
reference_alias_ptr_type (*use->op_p),
iv, base_hint, data->speed);
copy_ref_info (ref, *use->op_p);