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re PR tree-optimization/66768 (address space gets lost on literal pointer) 

PR tree-optimization/66768
	* tree-ssa-loop-ivopts.c (find_interesting_uses_address): Skip addr
	iv_use if base object can't be determined.

	gcc/testsuite
	* gcc.target/i386/pr66768.c: New test.

From-SVN: r245837
This commit is contained in:
Bin Cheng 2017-03-02 11:25:11 +00:00 committed by Bin Cheng
parent 6d03bdcc81
commit 653a4b32fe
4 changed files with 32 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2017-03-02 Bin Cheng <bin.cheng@arm.com>
PR tree-optimization/66768
* tree-ssa-loop-ivopts.c (find_interesting_uses_address): Skip addr
iv_use if base object can't be determined.
2017-03-02 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/79345

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2017-03-02 Bin Cheng <bin.cheng@arm.com>
PR tree-optimization/66768
* gcc.target/i386/pr66768.c: New test.
2017-03-02 Richard Biener <rguenther@suse.de>
* gcc.dg/rtl/x86_64/dfinit.c: Only run for lp64.

17
gcc/testsuite/gcc.target/i386/pr66768.c Normal file
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@ -0,0 +1,17 @@
/* { dg-do compile } */
/* { dg-options "-O2" } */
typedef __seg_gs struct foo_s {
int a[20];
} foo_t;
int sum(void)
{
const foo_t *p = (const foo_t *)0x1234;
int i, total=0;
for (i=0; i<20; i++)
total += p->a[i];
return total;
}
/* { dg-final { scan-assembler "add*.\[ \t\]%gs:" } } */

4
gcc/tree-ssa-loop-ivopts.c
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@ -2324,6 +2324,10 @@ find_interesting_uses_address (struct ivopts_data *data, gimple *stmt,
}
civ = alloc_iv (data, base, step);
/* Fail if base object of this memory reference is unknown. */
if (civ->base_object == NULL_TREE)
goto fail;
record_group_use (data, op_p, civ, stmt, USE_ADDRESS);
return;