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* [Bug tree-optimization/66423] New: a % (1 << b) no longer gets folded to a & (1 << b) for unsigned a and b @ 2015-06-04 22:24 ppalka at gcc dot gnu.org 2015-06-05 4:02 ` [Bug tree-optimization/66423] [6 Regression] a % (1 << b) no longer gets folded to a & (1 << b) for unsigned a glisse at gcc dot gnu.org ` (2 more replies) 0 siblings, 3 replies; 4+ messages in thread From: ppalka at gcc dot gnu.org @ 2015-06-04 22:24 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66423 Bug ID: 66423 Summary: a % (1 << b) no longer gets folded to a & (1 << b) for unsigned a and b Product: gcc Version: 6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: ppalka at gcc dot gnu.org Target Milestone: --- Test case: unsigned int my_mod (unsigned int a, unsigned int b) { return a % (1 << b); } no longer gets folded to a & (1 << b). I have not done a bisection but it may be that r223690 is the cause. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/66423] [6 Regression] a % (1 << b) no longer gets folded to a & (1 << b) for unsigned a 2015-06-04 22:24 [Bug tree-optimization/66423] New: a % (1 << b) no longer gets folded to a & (1 << b) for unsigned a and b ppalka at gcc dot gnu.org @ 2015-06-05 4:02 ` glisse at gcc dot gnu.org 2015-06-08 10:48 ` rguenth at gcc dot gnu.org 2015-06-09 12:32 ` rguenth at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: glisse at gcc dot gnu.org @ 2015-06-05 4:02 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66423 Marc Glisse <glisse at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2015-06-05 Target Milestone|--- |6.0 Summary|a % (1 << b) no longer gets |[6 Regression] a % (1 << b) |folded to a & (1 << b) for |no longer gets folded to a |unsigned a and b |& (1 << b) for unsigned a Ever confirmed|0 |1 --- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> --- a % (unsigned int) (1 << b) The pattern in match.pd seems to be missing a 'convert' case. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/66423] [6 Regression] a % (1 << b) no longer gets folded to a & (1 << b) for unsigned a 2015-06-04 22:24 [Bug tree-optimization/66423] New: a % (1 << b) no longer gets folded to a & (1 << b) for unsigned a and b ppalka at gcc dot gnu.org 2015-06-05 4:02 ` [Bug tree-optimization/66423] [6 Regression] a % (1 << b) no longer gets folded to a & (1 << b) for unsigned a glisse at gcc dot gnu.org @ 2015-06-08 10:48 ` rguenth at gcc dot gnu.org 2015-06-09 12:32 ` rguenth at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: rguenth at gcc dot gnu.org @ 2015-06-08 10:48 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66423 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |ASSIGNED Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org --- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> --- Mine. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/66423] [6 Regression] a % (1 << b) no longer gets folded to a & (1 << b) for unsigned a 2015-06-04 22:24 [Bug tree-optimization/66423] New: a % (1 << b) no longer gets folded to a & (1 << b) for unsigned a and b ppalka at gcc dot gnu.org 2015-06-05 4:02 ` [Bug tree-optimization/66423] [6 Regression] a % (1 << b) no longer gets folded to a & (1 << b) for unsigned a glisse at gcc dot gnu.org 2015-06-08 10:48 ` rguenth at gcc dot gnu.org @ 2015-06-09 12:32 ` rguenth at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: rguenth at gcc dot gnu.org @ 2015-06-09 12:32 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66423 --- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> --- Author: rguenth Date: Tue Jun 9 12:31:43 2015 New Revision: 224279 URL: https://gcc.gnu.org/viewcvs?rev=224279&root=gcc&view=rev Log: 2015-06-09 Richard Biener <rguenther@suse.de> PR middle-end/66423 * match.pd: Handle A % (unsigned)(1 << B). * gcc.dg/fold-modpow2.c: New testcase. Added: trunk/gcc/testsuite/gcc.dg/fold-modpow2.c Modified: trunk/gcc/ChangeLog trunk/gcc/match.pd trunk/gcc/testsuite/ChangeLog ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2015-06-09 12:32 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2015-06-04 22:24 [Bug tree-optimization/66423] New: a % (1 << b) no longer gets folded to a & (1 << b) for unsigned a and b ppalka at gcc dot gnu.org 2015-06-05 4:02 ` [Bug tree-optimization/66423] [6 Regression] a % (1 << b) no longer gets folded to a & (1 << b) for unsigned a glisse at gcc dot gnu.org 2015-06-08 10:48 ` rguenth at gcc dot gnu.org 2015-06-09 12:32 ` rguenth at gcc dot gnu.org
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