public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/98563] [10/11 Regression] vectorization fails while it worked on gcc 9 and earlier Date: Thu, 07 Jan 2021 08:24:35 +0000 [thread overview] Message-ID: <bug-98563-4-e3f9Htgrak@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-98563-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98563 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|--- |10.3 Status|UNCONFIRMED |NEW Target| |x86_64-*-* i?86-*-* Keywords| |missed-optimization, openmp Summary|regression: vectorization |[10/11 Regression] |fails while it worked on |vectorization fails while |gcc 9 and earlier |it worked on gcc 9 and | |earlier Priority|P3 |P2 CC| |jakub at gcc dot gnu.org Blocks| |53947 Ever confirmed|0 |1 Last reconfirmed| |2021-01-07 --- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> --- So the issue is that GCC 9 was able to vectorize the loop while GCC 10 and trunk are not but those vectorize the basic block (where there's only enough data to use SSE). > g++-10 t.C -march=skylake-avx512 -O3 -fopenmp-simd -fdump-tree-vect-details -S -fopt-info-vec t.C:4:6: optimized: basic block part vectorized using 32 byte vectors > g++-9 t.C -march=skylake-avx512 -O3 -fopenmp-simd -fdump-tree-vect-details -S -fopt-info-vec t.C:8:26: optimized: loop vectorized using 32 byte vectors the reason it fails is Creating dr for REALPART_EXPR <D.49590[_13]._M_value> analyze_innermost: t.C:4:6: missed: failed: evolution of offset is not affine. base_address: offset from base address: constant offset from base address: step: base alignment: 0 base misalignment: 0 offset alignment: 0 step alignment: 0 base_object: D.49590 Access function 0: 0 Access function 1: 0 Access function 2: scev_not_known; where this is _13 = .GOMP_SIMD_LANE (simduid.0_12(D), 0); REALPART_EXPR <D.49590[_13]._M_value> = _26; IMAGPART_EXPR <D.49590[_13]._M_value> = _7; _20 = REALPART_EXPR <MEM <struct complex[64]> [(const struct complex &)&D.49590][_13]._M_value>; I'm not sure why this is here with GCC 10+ but not GCC 9. Jakub? Referenced Bugs: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53947 [Bug 53947] [meta-bug] vectorizer missed-optimizations
next prev parent reply other threads:[~2021-01-07 8:24 UTC|newest] Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-01-06 14:53 [Bug tree-optimization/98563] New: regression: " nathanael.schaeffer at gmail dot com 2021-01-06 15:04 ` [Bug tree-optimization/98563] " nathanael.schaeffer at gmail dot com 2021-01-07 8:24 ` rguenth at gcc dot gnu.org [this message] 2021-01-07 8:34 ` [Bug tree-optimization/98563] [10/11 Regression] " nathanael.schaeffer at gmail dot com 2021-01-07 15:42 ` [Bug tree-optimization/98563] [10/11 Regression] vectorization fails while it worked on gcc 9 and earlier since since r10-2271-gd81ab49d0586fca0 marxin at gcc dot gnu.org 2021-01-25 12:58 ` jakub at gcc dot gnu.org 2021-01-26 12:11 ` rguenth at gcc dot gnu.org 2021-01-26 12:48 ` jakub at gcc dot gnu.org 2021-01-26 13:24 ` rguenth at gcc dot gnu.org 2021-01-26 13:34 ` jakub at gcc dot gnu.org 2021-04-08 12:02 ` rguenth at gcc dot gnu.org 2022-06-28 10:43 ` [Bug tree-optimization/98563] [10/11/12/13 " jakub at gcc dot gnu.org 2023-07-07 10:38 ` [Bug tree-optimization/98563] [11/12/13/14 " rguenth at gcc dot gnu.org 2024-02-21 4:27 ` pinskia at gcc dot gnu.org
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=bug-98563-4-e3f9Htgrak@http.gcc.gnu.org/bugzilla/ \ --to=gcc-bugzilla@gcc.gnu.org \ --cc=gcc-bugs@gcc.gnu.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).