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From: "tnfchris at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/114151] [14 Regression] weird and inefficient codegen and addressing modes since g:a0b1798042d033fd2cc2c806afbb77875dd2909b Date: Wed, 28 Feb 2024 16:51:53 +0000 [thread overview] Message-ID: <bug-114151-4-cyh91423Io@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-114151-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114151 --- Comment #3 from Tamar Christina <tnfchris at gcc dot gnu.org> --- > > This was a correctness fix btw, so I'm not sure we can easily recover - we > could try using niter information for CHREC_VARIABLE but then there's > variable niter here so I don't see a chance. > It looks like it's mostly SVE suffering here. Adv. SIMD an scalar codegen seems to have vastly improved with it. we see ~10% improvements due to better addressing for scalar. It also only happens at -O3 but -O2 is fine, which is weird as I was expected IVopts to be enabled at -O2 too. > > OTOH the +1 could make it overflow for large size. > > Can you test the above? It should be an incremental improvement. > Applying the changes does not seem to make a difference for the final codegen :(
next prev parent reply other threads:[~2024-02-28 16:51 UTC|newest] Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-02-28 13:57 [Bug tree-optimization/114151] New: " tnfchris at gcc dot gnu.org 2024-02-28 14:33 ` [Bug tree-optimization/114151] " rguenth at gcc dot gnu.org 2024-02-28 14:36 ` rguenth at gcc dot gnu.org 2024-02-28 16:51 ` tnfchris at gcc dot gnu.org [this message] 2024-02-29 7:19 ` rguenther at suse dot de 2024-02-29 18:15 ` amacleod at redhat dot com 2024-03-01 9:37 ` rguenth at gcc dot gnu.org 2024-03-01 15:02 ` [Bug tree-optimization/114151] [14 Regression] weird and inefficient codegen and addressing modes since r14-9193 amacleod at redhat dot com 2024-03-04 7:47 ` rguenth at gcc dot gnu.org 2024-03-06 3:37 ` amacleod at redhat dot com 2024-03-06 7:14 ` rguenth at gcc dot gnu.org 2024-03-06 7:31 ` rguenth at gcc dot gnu.org 2024-03-06 14:57 ` amacleod at redhat dot com 2024-03-06 20:05 ` amacleod at redhat dot com 2024-03-07 8:04 ` rguenth at gcc dot gnu.org 2024-03-07 15:53 ` amacleod at redhat dot com 2024-03-07 20:37 ` law at gcc dot gnu.org 2024-03-08 10:13 ` rguenth at gcc dot gnu.org 2024-03-08 10:22 ` tnfchris at gcc dot gnu.org 2024-03-08 14:10 ` rguenth at gcc dot gnu.org 2024-03-12 9:59 ` rguenth at gcc dot gnu.org 2024-03-12 10:00 ` rguenth at gcc dot gnu.org 2024-03-12 20:41 ` amacleod at redhat dot com 2024-03-13 7:38 ` rguenth at gcc dot gnu.org 2024-03-13 17:37 ` amacleod at redhat dot com 2024-03-19 12:12 ` cvs-commit at gcc dot gnu.org 2024-03-19 12:16 ` rguenth at gcc dot gnu.org
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