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* [Bug tree-optimization/111276] New: rewrite_to_defined_overflow rewrites already defined code
@ 2023-09-03 2:52 pinskia at gcc dot gnu.org
2023-09-03 2:52 ` [Bug tree-optimization/111276] " pinskia at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-09-03 2:52 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111276
Bug ID: 111276
Summary: rewrite_to_defined_overflow rewrites already defined
code
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Keywords: compile-time-hog, internal-improvement
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: pinskia at gcc dot gnu.org
Reporter: pinskia at gcc dot gnu.org
Target Milestone: ---
Take:
```
int bcmp_2(char *a, char *b, unsigned s) {
if (s < 16) {
if (s >= 8)
return 1;
}
return 0;
}
```
ifcombine produces:
```
rewriting stmt with undefined signed overflow _4 = s_2(D) + 4294967288;
unsigned intD.9 s_2(D) = sD.3394;
...
_5 = s_2(D) + 4294967288;
_4 = (unsigned intD.9) _5;
if (_4 <= 7)
```
Seems like we don't need to do a rewrite in this case ...
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/111276] rewrite_to_defined_overflow rewrites already defined code
2023-09-03 2:52 [Bug tree-optimization/111276] New: rewrite_to_defined_overflow rewrites already defined code pinskia at gcc dot gnu.org
@ 2023-09-03 2:52 ` pinskia at gcc dot gnu.org
2023-09-03 16:19 ` pinskia at gcc dot gnu.org
2023-09-12 10:49 ` rguenth at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-09-03 2:52 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111276
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2023-09-03
Status|UNCONFIRMED |ASSIGNED
Ever confirmed|0 |1
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Mine for now.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/111276] rewrite_to_defined_overflow rewrites already defined code
2023-09-03 2:52 [Bug tree-optimization/111276] New: rewrite_to_defined_overflow rewrites already defined code pinskia at gcc dot gnu.org
2023-09-03 2:52 ` [Bug tree-optimization/111276] " pinskia at gcc dot gnu.org
@ 2023-09-03 16:19 ` pinskia at gcc dot gnu.org
2023-09-12 10:49 ` rguenth at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-09-03 16:19 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111276
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
URL| |https://gcc.gnu.org/piperma
| |il/gcc-patches/2023-Septemb
| |er/629171.html
Keywords| |patch
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Patch posted:
https://gcc.gnu.org/pipermail/gcc-patches/2023-September/629171.html
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/111276] rewrite_to_defined_overflow rewrites already defined code
2023-09-03 2:52 [Bug tree-optimization/111276] New: rewrite_to_defined_overflow rewrites already defined code pinskia at gcc dot gnu.org
2023-09-03 2:52 ` [Bug tree-optimization/111276] " pinskia at gcc dot gnu.org
2023-09-03 16:19 ` pinskia at gcc dot gnu.org
@ 2023-09-12 10:49 ` rguenth at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: rguenth at gcc dot gnu.org @ 2023-09-12 10:49 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111276
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think the API expects to be guarded to only be called on stmts that require
rewriting.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2023-09-12 10:49 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2023-09-03 2:52 [Bug tree-optimization/111276] New: rewrite_to_defined_overflow rewrites already defined code pinskia at gcc dot gnu.org
2023-09-03 2:52 ` [Bug tree-optimization/111276] " pinskia at gcc dot gnu.org
2023-09-03 16:19 ` pinskia at gcc dot gnu.org
2023-09-12 10:49 ` rguenth at gcc dot gnu.org
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