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* [Bug tree-optimization/52686] New: SLP crashes with WIDEN_LSHIFT_EXPR
@ 2012-03-23 15:42 uweigand at gcc dot gnu.org
2012-03-23 15:43 ` [Bug tree-optimization/52686] " uweigand at gcc dot gnu.org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: uweigand at gcc dot gnu.org @ 2012-03-23 15:42 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52686
Bug #: 52686
Summary: SLP crashes with WIDEN_LSHIFT_EXPR
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: uweigand@gcc.gnu.org
When building the following test case:
unsigned int output[4];
void test (unsigned short *p)
{
unsigned int x = *p;
if (x)
{
output[0] = x << 1;
output[1] = x << 1;
output[2] = x << 1;
output[3] = x << 1;
}
}
GCC crashes with various symptoms (segmentation fault if checking is disabled;
assertion failures along the lines of "vector VEC(tree,base) index domain
error, in vect_create_vectorized_promotion_stmts at tree-vect-stmts.c:2130" if
checking is enabled) when building on ARM with -O1 -ftree-vectorize -mfpu=neon
-mfloat-abi=softfp.
^ permalink raw reply [flat|nested] 5+ messages in thread* [Bug tree-optimization/52686] SLP crashes with WIDEN_LSHIFT_EXPR 2012-03-23 15:42 [Bug tree-optimization/52686] New: SLP crashes with WIDEN_LSHIFT_EXPR uweigand at gcc dot gnu.org @ 2012-03-23 15:43 ` uweigand at gcc dot gnu.org 2012-03-23 15:45 ` uweigand at gcc dot gnu.org ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: uweigand at gcc dot gnu.org @ 2012-03-23 15:43 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52686 --- Comment #2 from Ulrich Weigand <uweigand at gcc dot gnu.org> 2012-03-23 15:42:00 UTC --- Created attachment 26968 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26968 Handle WIDEN_LSHIFT_EXPR in vect_get_smallest_scalar_type The attached patch fixes the ICEs for me. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/52686] SLP crashes with WIDEN_LSHIFT_EXPR 2012-03-23 15:42 [Bug tree-optimization/52686] New: SLP crashes with WIDEN_LSHIFT_EXPR uweigand at gcc dot gnu.org 2012-03-23 15:43 ` [Bug tree-optimization/52686] " uweigand at gcc dot gnu.org @ 2012-03-23 15:45 ` uweigand at gcc dot gnu.org 2012-03-26 13:16 ` uweigand at gcc dot gnu.org 2012-03-26 14:00 ` uweigand at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: uweigand at gcc dot gnu.org @ 2012-03-23 15:45 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52686 Ulrich Weigand <uweigand at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |ASSIGNED Last reconfirmed| |2012-03-23 Ever Confirmed|0 |1 --- Comment #1 from Ulrich Weigand <uweigand at gcc dot gnu.org> 2012-03-23 15:38:43 UTC --- It seems the root cause of all the memory problems is that vect_get_smallest_scalar_type neglects to handle WIDEN_LSHIFT_EXPR, which causes the SLP pass to mis-compute the number of statements needed to vectorize the expression. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/52686] SLP crashes with WIDEN_LSHIFT_EXPR 2012-03-23 15:42 [Bug tree-optimization/52686] New: SLP crashes with WIDEN_LSHIFT_EXPR uweigand at gcc dot gnu.org 2012-03-23 15:43 ` [Bug tree-optimization/52686] " uweigand at gcc dot gnu.org 2012-03-23 15:45 ` uweigand at gcc dot gnu.org @ 2012-03-26 13:16 ` uweigand at gcc dot gnu.org 2012-03-26 14:00 ` uweigand at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: uweigand at gcc dot gnu.org @ 2012-03-26 13:16 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52686 --- Comment #3 from Ulrich Weigand <uweigand at gcc dot gnu.org> 2012-03-26 13:13:14 UTC --- Author: uweigand Date: Mon Mar 26 13:13:07 2012 New Revision: 185795 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=185795 Log: gcc/ PR tree-optimization/52686 * tree-vect-data-refs.c (vect_get_smallest_scalar_type): Handle WIDEN_LSHIFT_EXPR. gcc/testsuite/ PR tree-optimization/52686 * gcc.target/arm/pr52686.c: New test. Added: trunk/gcc/testsuite/gcc.target/arm/pr52686.c Modified: trunk/gcc/ChangeLog trunk/gcc/testsuite/ChangeLog trunk/gcc/tree-vect-data-refs.c ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/52686] SLP crashes with WIDEN_LSHIFT_EXPR 2012-03-23 15:42 [Bug tree-optimization/52686] New: SLP crashes with WIDEN_LSHIFT_EXPR uweigand at gcc dot gnu.org ` (2 preceding siblings ...) 2012-03-26 13:16 ` uweigand at gcc dot gnu.org @ 2012-03-26 14:00 ` uweigand at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: uweigand at gcc dot gnu.org @ 2012-03-26 14:00 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52686 Ulrich Weigand <uweigand at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution| |FIXED --- Comment #4 from Ulrich Weigand <uweigand at gcc dot gnu.org> 2012-03-26 13:16:30 UTC --- Fixed. ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2012-03-26 13:16 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2012-03-23 15:42 [Bug tree-optimization/52686] New: SLP crashes with WIDEN_LSHIFT_EXPR uweigand at gcc dot gnu.org 2012-03-23 15:43 ` [Bug tree-optimization/52686] " uweigand at gcc dot gnu.org 2012-03-23 15:45 ` uweigand at gcc dot gnu.org 2012-03-26 13:16 ` uweigand at gcc dot gnu.org 2012-03-26 14:00 ` uweigand at gcc dot gnu.org
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