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* [Bug tree-optimization/108916] New: Miss vectorization for masked gather w/o restrict qualifier. @ 2023-02-24 5:08 crazylht at gmail dot com 2023-02-24 5:10 ` [Bug tree-optimization/108916] " crazylht at gmail dot com ` (2 more replies) 0 siblings, 3 replies; 4+ messages in thread From: crazylht at gmail dot com @ 2023-02-24 5:08 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108916 Bug ID: 108916 Summary: Miss vectorization for masked gather w/o restrict qualifier. Product: gcc Version: 13.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: crazylht at gmail dot com Target Milestone: --- void foo1 (double* __restrict a, long long* b, double* c, long long* d) { for (long long i = 0; i != 10000; i++) { if (b[i]) a[i] = 0; else a[i] = c[d[i]]; } } void foo2 (double* __restrict a, long long* b, double* __restrict c, long long* d) { for (long long i = 0; i != 10000; i++) { if (b[i]) a[i] = 0; else a[i] = c[d[i]]; } } w/ -Ofast -march=skylake-avx512, foo1 can't be vectorized, but foo2 can, the only difference between foo1 and foo2 is restrict qualifier for double* c. But there's already a restrict qualifier for double* __restrict a in both cases, why double* __restrict c matters. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/108916] Miss vectorization for masked gather w/o restrict qualifier. 2023-02-24 5:08 [Bug tree-optimization/108916] New: Miss vectorization for masked gather w/o restrict qualifier crazylht at gmail dot com @ 2023-02-24 5:10 ` crazylht at gmail dot com 2023-02-24 5:24 ` pinskia at gcc dot gnu.org 2023-02-24 12:59 ` rguenth at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: crazylht at gmail dot com @ 2023-02-24 5:10 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108916 Hongtao.liu <crazylht at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Target| |x86_64-*-* i?86-*-* --- Comment #1 from Hongtao.liu <crazylht at gmail dot com> --- https://godbolt.org/z/xxMjGhh5e ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/108916] Miss vectorization for masked gather w/o restrict qualifier. 2023-02-24 5:08 [Bug tree-optimization/108916] New: Miss vectorization for masked gather w/o restrict qualifier crazylht at gmail dot com 2023-02-24 5:10 ` [Bug tree-optimization/108916] " crazylht at gmail dot com @ 2023-02-24 5:24 ` pinskia at gcc dot gnu.org 2023-02-24 12:59 ` rguenth at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu.org @ 2023-02-24 5:24 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108916 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Blocks| |49774, 53947 Keywords| |alias, missed-optimization --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- I thought there was another bug about restrict and only one of the arguments marked but I can't find it. Referenced Bugs: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=49774 [Bug 49774] [meta-bug] restrict qualification aliasing issues https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53947 [Bug 53947] [meta-bug] vectorizer missed-optimizations ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/108916] Miss vectorization for masked gather w/o restrict qualifier. 2023-02-24 5:08 [Bug tree-optimization/108916] New: Miss vectorization for masked gather w/o restrict qualifier crazylht at gmail dot com 2023-02-24 5:10 ` [Bug tree-optimization/108916] " crazylht at gmail dot com 2023-02-24 5:24 ` pinskia at gcc dot gnu.org @ 2023-02-24 12:59 ` rguenth at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: rguenth at gcc dot gnu.org @ 2023-02-24 12:59 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108916 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Ever confirmed|0 |1 Last reconfirmed| |2023-02-24 Status|UNCONFIRMED |NEW --- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> --- Should be indeed enough. ISTR the issue is with if-conversion and .MASK_LOAD or .MASK_STORE given that we currently cannot annotate function calls with restrict tags. And yes, I think there's a duplicate bug. ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2023-02-24 12:59 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2023-02-24 5:08 [Bug tree-optimization/108916] New: Miss vectorization for masked gather w/o restrict qualifier crazylht at gmail dot com 2023-02-24 5:10 ` [Bug tree-optimization/108916] " crazylht at gmail dot com 2023-02-24 5:24 ` pinskia at gcc dot gnu.org 2023-02-24 12:59 ` rguenth at gcc dot gnu.org
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