re PR tree-optimization/68806 (internal compiler error: Segmentation fault)

2015-12-10  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/68806
	* tree-vect-loop.c (vect_analyze_loop_2): Properly detect
	reduction chains and ignore SLP reductions.

	* gcc.dg/torture/pr68806.c: New testcase.

From-SVN: r231493
This commit is contained in:
Richard Biener 2015-12-10 09:00:58 +00:00 committed by Richard Biener
parent a839a8f708
commit 77ad31753c
4 changed files with 30 additions and 3 deletions

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@ -1,3 +1,9 @@
2015-12-10 Richard Biener <rguenther@suse.de>
PR tree-optimization/68806
* tree-vect-loop.c (vect_analyze_loop_2): Properly detect
reduction chains and ignore SLP reductions.
2015-12-10 Richard Biener <rguenther@suse.de>
* tree-if-conv.c (if_convertible_loop_p_1): Do not compute

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@ -1,3 +1,8 @@
2015-12-10 Richard Biener <rguenther@suse.de>
PR tree-optimization/68806
* gcc.dg/torture/pr68806.c: New testcase.
2015-12-08 Jan Hubicka <hubicka@ucw.cz>
PR ipa/61886

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@ -0,0 +1,13 @@
/* { dg-do compile } */
int sad(const unsigned char *p1, long p2)
{
int a = 0;
for (int y = 0; y < 16; y++)
{
for (int x = 0; x < 12; x++)
a += p1[x];
p1 += p2;
}
return a;
}

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@ -2123,9 +2123,12 @@ again:
if (!slp)
return false;
/* If there are reduction chains re-trying will fail anyway. */
if (! LOOP_VINFO_REDUCTION_CHAINS (loop_vinfo).is_empty ())
return false;
/* Likewise if the grouped loads or stores in the SLP cannot be handled
via interleaving or lane instructions or if there were any SLP
reductions. */
via interleaving or lane instructions. */
slp_instance instance;
slp_tree node;
unsigned i, j;
@ -2135,7 +2138,7 @@ again:
vinfo = vinfo_for_stmt
(SLP_TREE_SCALAR_STMTS (SLP_INSTANCE_TREE (instance))[0]);
if (! STMT_VINFO_GROUPED_ACCESS (vinfo))
return false;
continue;
vinfo = vinfo_for_stmt (STMT_VINFO_GROUP_FIRST_ELEMENT (vinfo));
unsigned int size = STMT_VINFO_GROUP_SIZE (vinfo);
tree vectype = STMT_VINFO_VECTYPE (vinfo);