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* [Bug c/33711] New: Missed optimization: reduction by subtraction (vectorizer)
@ 2007-10-09 13:20 eres at il dot ibm dot com
2007-10-09 13:50 ` [Bug tree-optimization/33711] " eres at il dot ibm dot com
2007-12-08 23:12 ` pinskia at gcc dot gnu dot org
0 siblings, 2 replies; 5+ messages in thread
From: eres at il dot ibm dot com @ 2007-10-09 13:20 UTC (permalink / raw)
To: gcc-bugs
For example:
for (i = 0; i < N; i++) {
udiff -= (ub[i] * uc[i]);
--
Summary: Missed optimization: reduction by subtraction
(vectorizer)
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: eres at il dot ibm dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33711
^ permalink raw reply [flat|nested] 5+ messages in thread* [Bug tree-optimization/33711] Missed optimization: reduction by subtraction (vectorizer) 2007-10-09 13:20 [Bug c/33711] New: Missed optimization: reduction by subtraction (vectorizer) eres at il dot ibm dot com @ 2007-10-09 13:50 ` eres at il dot ibm dot com 2007-12-08 23:12 ` pinskia at gcc dot gnu dot org 1 sibling, 0 replies; 5+ messages in thread From: eres at il dot ibm dot com @ 2007-10-09 13:50 UTC (permalink / raw) To: gcc-bugs ------- Comment #1 from eres at il dot ibm dot com 2007-10-09 13:49 ------- The loop in the above example does not get vectorized because of the subtraction in reduction; which is currently not supported. Taken from the vectorizer dump: test.c:19: note: worklist: examine stmt: udiff_7 = udiff_20 - D.2210_6 test.c:19: note: vect_is_simple_use: operand udiff_20 test.c:19: note: def_stmt: udiff_20 = PHI <udiff_7(4), 1.5e+3(2)> test.c:19: note: Unsupported pattern. test.c:19: note: not vectorized: unsupported use in stmt. test.c:19: note: unexpected pattern. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33711 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/33711] Missed optimization: reduction by subtraction (vectorizer) 2007-10-09 13:20 [Bug c/33711] New: Missed optimization: reduction by subtraction (vectorizer) eres at il dot ibm dot com 2007-10-09 13:50 ` [Bug tree-optimization/33711] " eres at il dot ibm dot com @ 2007-12-08 23:12 ` pinskia at gcc dot gnu dot org 1 sibling, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu dot org @ 2007-12-08 23:12 UTC (permalink / raw) To: gcc-bugs ------- Comment #2 from pinskia at gcc dot gnu dot org 2007-12-08 23:12 ------- Confirmed. -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Severity|normal |enhancement Status|UNCONFIRMED |NEW Ever Confirmed|0 |1 Keywords| |missed-optimization Last reconfirmed|0000-00-00 00:00:00 |2007-12-08 23:12:46 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33711 ^ permalink raw reply [flat|nested] 5+ messages in thread
[parent not found: <bug-33711-4@http.gcc.gnu.org/bugzilla/>]
* [Bug tree-optimization/33711] Missed optimization: reduction by subtraction (vectorizer) [not found] <bug-33711-4@http.gcc.gnu.org/bugzilla/> @ 2012-07-13 8:49 ` rguenth at gcc dot gnu.org 2012-07-16 13:05 ` rguenth at gcc dot gnu.org 1 sibling, 0 replies; 5+ messages in thread From: rguenth at gcc dot gnu.org @ 2012-07-13 8:49 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33711 Richard Guenther <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Blocks| |53947 --- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-07-13 08:49:08 UTC --- Link to vectorizer missed-optimization meta-bug. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/33711] Missed optimization: reduction by subtraction (vectorizer) [not found] <bug-33711-4@http.gcc.gnu.org/bugzilla/> 2012-07-13 8:49 ` rguenth at gcc dot gnu.org @ 2012-07-16 13:05 ` rguenth at gcc dot gnu.org 1 sibling, 0 replies; 5+ messages in thread From: rguenth at gcc dot gnu.org @ 2012-07-16 13:05 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33711 Richard Guenther <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |FIXED --- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-07-16 13:05:15 UTC --- Fixed. ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2012-07-16 13:05 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2007-10-09 13:20 [Bug c/33711] New: Missed optimization: reduction by subtraction (vectorizer) eres at il dot ibm dot com
2007-10-09 13:50 ` [Bug tree-optimization/33711] " eres at il dot ibm dot com
2007-12-08 23:12 ` pinskia at gcc dot gnu dot org
[not found] <bug-33711-4@http.gcc.gnu.org/bugzilla/>
2012-07-13 8:49 ` rguenth at gcc dot gnu.org
2012-07-16 13:05 ` rguenth at gcc dot gnu.org
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