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* [Bug tree-optimization/57567] New: Missed optimsation : compare + or
@ 2013-06-08 15:42 john@bass-software.com
2013-06-10 8:44 ` [Bug tree-optimization/57567] Missed optimisation: " rguenth at gcc dot gnu.org
2021-07-20 2:34 ` pinskia at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: john@bass-software.com @ 2013-06-08 15:42 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57567
Bug ID: 57567
Summary: Missed optimsation : compare + or
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: john@bass-software.com
Using 4.9.0 20130608 (experimental) [trunk revision 199851], target
arm-unknown-eabi.
The following case produces suboptimal code:
unsigned
test (unsigned t)
{
if (t != (unsigned)-1)
t |= 3;
return t;
}
Result:
cmn r0, #1
orrne r0, r0, #3
A simple:
orr r0, r0, #3
would be enough.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug tree-optimization/57567] Missed optimisation: compare + or
2013-06-08 15:42 [Bug tree-optimization/57567] New: Missed optimsation : compare + or john@bass-software.com
@ 2013-06-10 8:44 ` rguenth at gcc dot gnu.org
2021-07-20 2:34 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: rguenth at gcc dot gnu.org @ 2013-06-10 8:44 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57567
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|UNCONFIRMED |NEW
Last reconfirmed| |2013-06-10
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. ISTR Jakub did some work in this area.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug tree-optimization/57567] Missed optimisation: compare + or
2013-06-08 15:42 [Bug tree-optimization/57567] New: Missed optimsation : compare + or john@bass-software.com
2013-06-10 8:44 ` [Bug tree-optimization/57567] Missed optimisation: " rguenth at gcc dot gnu.org
@ 2021-07-20 2:34 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-07-20 2:34 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57567
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Target Milestone|--- |7.0
Severity|normal |enhancement
Resolution|--- |FIXED
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Fixed for a while now. Maybe before even GCC 7.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2021-07-20 2:34 UTC | newest]
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2013-06-08 15:42 [Bug tree-optimization/57567] New: Missed optimsation : compare + or john@bass-software.com
2013-06-10 8:44 ` [Bug tree-optimization/57567] Missed optimisation: " rguenth at gcc dot gnu.org
2021-07-20 2:34 ` pinskia at gcc dot gnu.org
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