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* [Bug tree-optimization/114465] New: "x % const1 % const2" should be optimized if const1 % const2 == 0
@ 2024-03-25 12:34 xry111 at gcc dot gnu.org
2024-03-25 12:34 ` [Bug tree-optimization/114465] " xry111 at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: xry111 at gcc dot gnu.org @ 2024-03-25 12:34 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114465
Bug ID: 114465
Summary: "x % const1 % const2" should be optimized if const1 %
const2 == 0
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: xry111 at gcc dot gnu.org
Target Milestone: ---
int test(int x) { return x % 114514 % 1847; }
This should be optimized as-is
int test(int x) { return x % 1847; }
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/114465] "x % const1 % const2" should be optimized if const1 % const2 == 0
2024-03-25 12:34 [Bug tree-optimization/114465] New: "x % const1 % const2" should be optimized if const1 % const2 == 0 xry111 at gcc dot gnu.org
@ 2024-03-25 12:34 ` xry111 at gcc dot gnu.org
2024-03-25 18:13 ` jsm28 at gcc dot gnu.org
2024-03-25 18:52 ` pinskia at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: xry111 at gcc dot gnu.org @ 2024-03-25 12:34 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114465
Xi Ruoyao <xry111 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
Keywords| |missed-optimization
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/114465] "x % const1 % const2" should be optimized if const1 % const2 == 0
2024-03-25 12:34 [Bug tree-optimization/114465] New: "x % const1 % const2" should be optimized if const1 % const2 == 0 xry111 at gcc dot gnu.org
2024-03-25 12:34 ` [Bug tree-optimization/114465] " xry111 at gcc dot gnu.org
@ 2024-03-25 18:13 ` jsm28 at gcc dot gnu.org
2024-03-25 18:52 ` pinskia at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2024-03-25 18:13 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114465
--- Comment #1 from Joseph S. Myers <jsm28 at gcc dot gnu.org> ---
Note that transforming x % 1 % -1 to x % -1 wouldn't strictly be valid (because
of undefined behavior from INT_MIN % -1), though hopefully cases with constant
1 or -1 get optimized to 0 anyway and the undefined behavior is only a problem
with a -1 that's not a constant.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/114465] "x % const1 % const2" should be optimized if const1 % const2 == 0
2024-03-25 12:34 [Bug tree-optimization/114465] New: "x % const1 % const2" should be optimized if const1 % const2 == 0 xry111 at gcc dot gnu.org
2024-03-25 12:34 ` [Bug tree-optimization/114465] " xry111 at gcc dot gnu.org
2024-03-25 18:13 ` jsm28 at gcc dot gnu.org
@ 2024-03-25 18:52 ` pinskia at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2024-03-25 18:52 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114465
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2024-03-25
Ever confirmed|0 |1
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2024-03-25 18:52 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2024-03-25 12:34 [Bug tree-optimization/114465] New: "x % const1 % const2" should be optimized if const1 % const2 == 0 xry111 at gcc dot gnu.org
2024-03-25 12:34 ` [Bug tree-optimization/114465] " xry111 at gcc dot gnu.org
2024-03-25 18:13 ` jsm28 at gcc dot gnu.org
2024-03-25 18:52 ` pinskia at gcc dot gnu.org
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