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* [Bug tree-optimization/67953] New: [6 Regression] match.pd: X - (X / Y) * Y wrong on change of sign
@ 2015-10-13 12:25 glisse at gcc dot gnu.org
2015-10-13 12:34 ` [Bug tree-optimization/67953] " mpolacek at gcc dot gnu.org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: glisse at gcc dot gnu.org @ 2015-10-13 12:25 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67953
Bug ID: 67953
Summary: [6 Regression] match.pd: X - (X / Y) * Y wrong on
change of sign
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: glisse at gcc dot gnu.org
CC: mpolacek at gcc dot gnu.org
Target Milestone: ---
$ cat z.c
#include <stdio.h>
unsigned f(signed a){
return (unsigned)a-((a/3)*3);
}
unsigned g(signed a){
return a-((a/3)*3);
}
int main(){
printf("%d %d\n", f(-5), g(-5));
}
$ gcc-5 z.c && ./a.out
-2 -2
$ clang z.c && ./a.out
-2 -2
$ gcc-snapshot z.c && ./a.out
2 -2
^ permalink raw reply [flat|nested] 5+ messages in thread* [Bug tree-optimization/67953] [6 Regression] match.pd: X - (X / Y) * Y wrong on change of sign 2015-10-13 12:25 [Bug tree-optimization/67953] New: [6 Regression] match.pd: X - (X / Y) * Y wrong on change of sign glisse at gcc dot gnu.org @ 2015-10-13 12:34 ` mpolacek at gcc dot gnu.org 2015-10-13 16:51 ` mpolacek at gcc dot gnu.org ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: mpolacek at gcc dot gnu.org @ 2015-10-13 12:34 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67953 Marek Polacek <mpolacek at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2015-10-13 Target Milestone|--- |6.0 Ever confirmed|0 |1 --- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> --- Started with r225195 :(. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/67953] [6 Regression] match.pd: X - (X / Y) * Y wrong on change of sign 2015-10-13 12:25 [Bug tree-optimization/67953] New: [6 Regression] match.pd: X - (X / Y) * Y wrong on change of sign glisse at gcc dot gnu.org 2015-10-13 12:34 ` [Bug tree-optimization/67953] " mpolacek at gcc dot gnu.org @ 2015-10-13 16:51 ` mpolacek at gcc dot gnu.org 2015-10-15 9:40 ` mpolacek at gcc dot gnu.org 2015-10-15 9:40 ` mpolacek at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: mpolacek at gcc dot gnu.org @ 2015-10-13 16:51 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67953 Marek Polacek <mpolacek at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |ASSIGNED Assignee|unassigned at gcc dot gnu.org |mpolacek at gcc dot gnu.org --- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> --- So mine. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/67953] [6 Regression] match.pd: X - (X / Y) * Y wrong on change of sign 2015-10-13 12:25 [Bug tree-optimization/67953] New: [6 Regression] match.pd: X - (X / Y) * Y wrong on change of sign glisse at gcc dot gnu.org 2015-10-13 12:34 ` [Bug tree-optimization/67953] " mpolacek at gcc dot gnu.org 2015-10-13 16:51 ` mpolacek at gcc dot gnu.org @ 2015-10-15 9:40 ` mpolacek at gcc dot gnu.org 2015-10-15 9:40 ` mpolacek at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: mpolacek at gcc dot gnu.org @ 2015-10-15 9:40 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67953 Marek Polacek <mpolacek at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |FIXED --- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> --- Fixed. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/67953] [6 Regression] match.pd: X - (X / Y) * Y wrong on change of sign 2015-10-13 12:25 [Bug tree-optimization/67953] New: [6 Regression] match.pd: X - (X / Y) * Y wrong on change of sign glisse at gcc dot gnu.org ` (2 preceding siblings ...) 2015-10-15 9:40 ` mpolacek at gcc dot gnu.org @ 2015-10-15 9:40 ` mpolacek at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: mpolacek at gcc dot gnu.org @ 2015-10-15 9:40 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67953 --- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> --- Author: mpolacek Date: Thu Oct 15 09:39:35 2015 New Revision: 228839 URL: https://gcc.gnu.org/viewcvs?rev=228839&root=gcc&view=rev Log: PR tree-optimization/67953 * match.pd (X - (X / Y) * Y): Don't change signedness of @0. * gcc.dg/fold-minus-6.c (fn4): Change the type of A to unsigned. * gcc.dg/torture/pr67953.c: New test. Added: trunk/gcc/testsuite/gcc.dg/torture/pr67953.c Modified: trunk/gcc/ChangeLog trunk/gcc/match.pd trunk/gcc/testsuite/ChangeLog trunk/gcc/testsuite/gcc.dg/fold-minus-6.c ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2015-10-15 9:40 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2015-10-13 12:25 [Bug tree-optimization/67953] New: [6 Regression] match.pd: X - (X / Y) * Y wrong on change of sign glisse at gcc dot gnu.org 2015-10-13 12:34 ` [Bug tree-optimization/67953] " mpolacek at gcc dot gnu.org 2015-10-13 16:51 ` mpolacek at gcc dot gnu.org 2015-10-15 9:40 ` mpolacek at gcc dot gnu.org 2015-10-15 9:40 ` mpolacek at gcc dot gnu.org
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