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re PR bootstrap/71816 (bootstrap broken on multiple targets) 

2016-07-11  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/71816
	* tree-ssa-pre.c (compute_avail): Adjust alignment of ref rather
	than replacing all of its operands.

	* gcc.dg/torture/pr71816.c: New testcase.

From-SVN: r238208
This commit is contained in:
Richard Biener 2016-07-11 13:32:51 +00:00 committed by Richard Biener
parent a442a050ad
commit f51606c71a
4 changed files with 36 additions and 7 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2016-07-11 Richard Biener <rguenther@suse.de>
PR tree-optimization/71816
* tree-ssa-pre.c (compute_avail): Adjust alignment of ref rather
than replacing all of its operands.
2016-07-11 Alan Modra <amodra@gmail.com>
* config/rs6000/rs6000.md (UNSPEC_DOLOOP): New unspec.

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2016-07-11 Richard Biener <rguenther@suse.de>
PR tree-optimization/71816
* gcc.dg/torture/pr71816.c: New testcase.
2016-07-09 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/71783

21
gcc/testsuite/gcc.dg/torture/pr71816.c Normal file
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@ -0,0 +1,21 @@
/* { dg-do compile } */
void *ext2fs_resize_mem_p;
struct ext2_icount_el {
int ino;
} * insert_icount_el_icount_1;
int insert_icount_el_icount, insert_icount_el_new_size;
void *memcpy();
void *realloc();
int ext2fs_resize_mem(void *p1) {
int size = 0;
memcpy(&ext2fs_resize_mem_p, p1, sizeof(ext2fs_resize_mem_p));
realloc(&ext2fs_resize_mem_p, size);
return 0;
}
struct ext2_icount_el *insert_icount_el() {
if (insert_icount_el_icount)
insert_icount_el_new_size = insert_icount_el_icount_1[0].ino;
ext2fs_resize_mem(&insert_icount_el_icount_1);
return 0;
}

11
gcc/tree-ssa-pre.c
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@ -3791,13 +3791,9 @@ compute_avail (void)
|| ref1->opcode == MEM_REF)
&& (TYPE_ALIGN (ref1->type)
> TYPE_ALIGN (ref2->type)))
{
ref->operands.release ();
ref->operands = operands;
ref1 = ref2;
}
else
operands.release ();
ref1->type
= build_aligned_type (ref1->type,
TYPE_ALIGN (ref2->type));
/* TBAA behavior is an obvious part so make sure
that the hashtable one covers this as well
by adjusting the ref alias set and its base. */
@ -3824,6 +3820,7 @@ compute_avail (void)
ref1->op2 = fold_convert (ptr_type_node,
ref1->op2);
}
operands.release ();
result = pre_expr_pool.allocate ();
result->kind = REFERENCE;