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* [Bug tree-optimization/46008] New: Floating point condexpr not vectorized
@ 2010-10-13 16:07 jakub at gcc dot gnu.org
2010-10-13 16:19 ` [Bug tree-optimization/46008] " jakub at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: jakub at gcc dot gnu.org @ 2010-10-13 16:07 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46008
Summary: Floating point condexpr not vectorized
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: jakub@gcc.gnu.org
CC: irar@gcc.gnu.org
void bar (double *);
void foo (double *a, double *b, double *c, double *d)
{
double e[1024], f;
int i;
for (i = 0; i < 1024; i++)
e[i] = (f = a[i] + b[i] + c[i] * d[i]) < 0.0 ? 3.0 : f;
bar (e);
}
is not vectorized at -O3 (is at -O3 -ffast-math though).
One problem is in ifcvt, which creates bogus dead stmts with bool type, but
even with that fixed the vectorizer gives up.
I'll attach ifcvt fix, is there something that can be done about this on the
vectorizer side?
^ permalink raw reply [flat|nested] 4+ messages in thread* [Bug tree-optimization/46008] Floating point condexpr not vectorized 2010-10-13 16:07 [Bug tree-optimization/46008] New: Floating point condexpr not vectorized jakub at gcc dot gnu.org @ 2010-10-13 16:19 ` jakub at gcc dot gnu.org 2010-10-14 19:34 ` jakub at gcc dot gnu.org 2012-03-13 23:27 ` pinskia at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: jakub at gcc dot gnu.org @ 2010-10-13 16:19 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46008 --- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> 2010-10-13 16:19:27 UTC --- Created attachment 22031 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22031 gcc46-pr46008.patch The ifcvt fix (untested). Still the vectorizer gives up, because the floating point comparison is first computed into a _Bool/bool variable which is then (with a single immediate use) immediately used in the following COND_EXPR. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/46008] Floating point condexpr not vectorized 2010-10-13 16:07 [Bug tree-optimization/46008] New: Floating point condexpr not vectorized jakub at gcc dot gnu.org 2010-10-13 16:19 ` [Bug tree-optimization/46008] " jakub at gcc dot gnu.org @ 2010-10-14 19:34 ` jakub at gcc dot gnu.org 2012-03-13 23:27 ` pinskia at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: jakub at gcc dot gnu.org @ 2010-10-14 19:34 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46008 --- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2010-10-14 19:34:20 UTC --- Author: jakub Date: Thu Oct 14 19:34:16 2010 New Revision: 165476 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=165476 Log: PR tree-optimization/46008 * tree-if-conv.c (predicate_bbs): Try to canonicalize c2 if possible. Modified: trunk/gcc/ChangeLog trunk/gcc/tree-if-conv.c ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/46008] Floating point condexpr not vectorized 2010-10-13 16:07 [Bug tree-optimization/46008] New: Floating point condexpr not vectorized jakub at gcc dot gnu.org 2010-10-13 16:19 ` [Bug tree-optimization/46008] " jakub at gcc dot gnu.org 2010-10-14 19:34 ` jakub at gcc dot gnu.org @ 2012-03-13 23:27 ` pinskia at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu.org @ 2012-03-13 23:27 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46008 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2012-03-13 Ever Confirmed|0 |1 Severity|normal |enhancement --- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-03-13 23:16:29 UTC --- I think there was some talk about changing COND_EXPR not to have a comparison as the first operand. ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2012-03-13 23:16 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2010-10-13 16:07 [Bug tree-optimization/46008] New: Floating point condexpr not vectorized jakub at gcc dot gnu.org 2010-10-13 16:19 ` [Bug tree-optimization/46008] " jakub at gcc dot gnu.org 2010-10-14 19:34 ` jakub at gcc dot gnu.org 2012-03-13 23:27 ` pinskia at gcc dot gnu.org
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