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* [Bug tree-optimization/15348] [tree-ssa] Convert (x < 0) || (y < 0) into (x | y) < 0. [not found] <20040509193050.15348.kazu@gcc.gnu.org> @ 2005-09-30 22:29 ` steven at gcc dot gnu dot org 0 siblings, 0 replies; 6+ messages in thread From: steven at gcc dot gnu dot org @ 2005-09-30 22:29 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From steven at gcc dot gnu dot org 2005-09-30 22:29 ------- For AMD64, the functions from the first test case don't produce the same code either, so combine is not catching this either. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15348 ^ permalink raw reply [flat|nested] 6+ messages in thread
[parent not found: <bug-15348-4@http.gcc.gnu.org/bugzilla/>]
* [Bug tree-optimization/15348] [tree-ssa] Convert (x < 0) || (y < 0) into (x | y) < 0. [not found] <bug-15348-4@http.gcc.gnu.org/bugzilla/> @ 2013-11-09 20:40 ` pinskia at gcc dot gnu.org 2014-10-31 4:01 ` pinskia at gcc dot gnu.org ` (2 subsequent siblings) 3 siblings, 0 replies; 6+ messages in thread From: pinskia at gcc dot gnu.org @ 2013-11-09 20:40 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15348 Bug 15348 depends on bug 15357, which changed state. Bug 15357 Summary: [tree-ssa] combing if statements http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15357 What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |FIXED ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/15348] [tree-ssa] Convert (x < 0) || (y < 0) into (x | y) < 0. [not found] <bug-15348-4@http.gcc.gnu.org/bugzilla/> 2013-11-09 20:40 ` pinskia at gcc dot gnu.org @ 2014-10-31 4:01 ` pinskia at gcc dot gnu.org 2020-03-11 7:06 ` dimhen at gmail dot com 2020-04-19 18:17 ` law at redhat dot com 3 siblings, 0 replies; 6+ messages in thread From: pinskia at gcc dot gnu.org @ 2014-10-31 4:01 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=15348 Bug 15348 depends on bug 15459, which changed state. Bug 15459 Summary: [meta-bug] there should be a tree combiner like the rtl one https://gcc.gnu.org/bugzilla/show_bug.cgi?id=15459 What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |FIXED ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/15348] [tree-ssa] Convert (x < 0) || (y < 0) into (x | y) < 0. [not found] <bug-15348-4@http.gcc.gnu.org/bugzilla/> 2013-11-09 20:40 ` pinskia at gcc dot gnu.org 2014-10-31 4:01 ` pinskia at gcc dot gnu.org @ 2020-03-11 7:06 ` dimhen at gmail dot com 2020-04-19 18:17 ` law at redhat dot com 3 siblings, 0 replies; 6+ messages in thread From: dimhen at gmail dot com @ 2020-03-11 7:06 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=15348 Dmitry G. Dyachenko <dimhen at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |dimhen at gmail dot com --- Comment #4 from Dmitry G. Dyachenko <dimhen at gmail dot com> --- x86_64 r10-7080 for me produce identical code -- c#0 with -O2 -- c#1 with -O ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/15348] [tree-ssa] Convert (x < 0) || (y < 0) into (x | y) < 0. [not found] <bug-15348-4@http.gcc.gnu.org/bugzilla/> ` (2 preceding siblings ...) 2020-03-11 7:06 ` dimhen at gmail dot com @ 2020-04-19 18:17 ` law at redhat dot com 3 siblings, 0 replies; 6+ messages in thread From: law at redhat dot com @ 2020-04-19 18:17 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=15348 Jeffrey A. Law <law at redhat dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |law at redhat dot com Resolution|--- |FIXED Status|NEW |RESOLVED --- Comment #5 from Jeffrey A. Law <law at redhat dot com> --- Resolved at some point in the past. Not worth the trouble to bisect. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug optimization/15348] New: [tree-ssa] Convert (x < 0) || (y < 0) into (x | y) < 0.
@ 2004-05-09 19:30 kazu at cs dot umass dot edu
2004-05-25 0:09 ` [Bug tree-optimization/15348] " pinskia at gcc dot gnu dot org
0 siblings, 1 reply; 6+ messages in thread
From: kazu at cs dot umass dot edu @ 2004-05-09 19:30 UTC (permalink / raw)
To: gcc-bugs
Convert foo() into baz().
void bar (void);
int
foo (int x, int y)
{
int t1 = x < 0;
int t2 = y < 0;
return t1 || t2;
}
int
baz (int x, int y)
{
return (x | y) < 0;
}
Needless to mention, we should do this fairly late in SSA optimizations.
--
Summary: [tree-ssa] Convert (x < 0) || (y < 0) into (x | y) < 0.
Product: gcc
Version: tree-ssa
Status: UNCONFIRMED
Keywords: pessimizes-code
Severity: enhancement
Priority: P2
Component: optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: kazu at cs dot umass dot edu
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15348
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug tree-optimization/15348] [tree-ssa] Convert (x < 0) || (y < 0) into (x | y) < 0. 2004-05-09 19:30 [Bug optimization/15348] New: " kazu at cs dot umass dot edu @ 2004-05-25 0:09 ` pinskia at gcc dot gnu dot org 0 siblings, 0 replies; 6+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-05-25 0:09 UTC (permalink / raw) To: gcc-bugs -- What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|3.5.0 |--- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15348 ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2020-04-19 18:17 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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[not found] <20040509193050.15348.kazu@gcc.gnu.org>
2005-09-30 22:29 ` [Bug tree-optimization/15348] [tree-ssa] Convert (x < 0) || (y < 0) into (x | y) < 0 steven at gcc dot gnu dot org
[not found] <bug-15348-4@http.gcc.gnu.org/bugzilla/>
2013-11-09 20:40 ` pinskia at gcc dot gnu.org
2014-10-31 4:01 ` pinskia at gcc dot gnu.org
2020-03-11 7:06 ` dimhen at gmail dot com
2020-04-19 18:17 ` law at redhat dot com
2004-05-09 19:30 [Bug optimization/15348] New: " kazu at cs dot umass dot edu
2004-05-25 0:09 ` [Bug tree-optimization/15348] " pinskia at gcc dot gnu dot org
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