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/54939] Very poor vectorization of loops with complex arithmetic Date: Fri, 21 Jul 2023 12:28:10 +0000 [thread overview] Message-ID: <bug-54939-4-RUWViAOLeQ@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-54939-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54939 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |FIXED CC| |crazylht at gmail dot com --- Comment #14 from Richard Biener <rguenth at gcc dot gnu.org> --- With SSE4.2 we now get .L3: movupd (%rdx,%rax), %xmm0 movupd (%rcx,%rax), %xmm4 movapd %xmm0, %xmm1 palignr $8, %xmm0, %xmm0 mulpd %xmm3, %xmm1 mulpd %xmm2, %xmm0 addpd %xmm4, %xmm1 addsubpd %xmm0, %xmm1 movups %xmm1, (%rcx,%rax) addq $16, %rax cmpq %rsi, %rax jne .L3 with AVX and FMA .L4: vmovupd (%rdx,%rax), %ymm0 vmovapd %ymm4, %ymm1 vfmadd213pd (%rcx,%rax), %ymm0, %ymm1 vpermilpd $5, %ymm0, %ymm0 vmulpd %ymm3, %ymm0, %ymm0 vaddsubpd %ymm0, %ymm1, %ymm1 vmovupd %ymm1, (%rcx,%rax) addq $32, %rax cmpq %rsi, %rax jne .L4 so I'd say fixed. But. With AVX512 we now get .L4: vmovupd (%rdi,%rax), %zmm0 vmovapd %zmm7, %zmm2 vmovapd %zmm4, %zmm6 vfmadd213pd (%rcx,%rax), %zmm0, %zmm2 vpermilpd $85, %zmm0, %zmm0 vfmadd132pd %zmm0, %zmm2, %zmm6 vfnmadd132pd %zmm4, %zmm2, %zmm0 vmovapd %zmm6, %zmm0{%k1} vmovupd %zmm0, (%rcx,%rax) addq $64, %rax cmpq %rax, %rsi jne .L4 it's odd that this only happens with -mprefer-vector-width=512 though. Do we possibly miss vec_{fm,}{addsub,subadd} for those? Looks like so. Tracking in PR110767. The vectorizer side is fixed.
next prev parent reply other threads:[~2023-07-21 12:28 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-10-16 14:22 [Bug tree-optimization/54939] New: " ysrumyan at gmail dot com 2012-10-16 14:37 ` [Bug tree-optimization/54939] " rguenth at gcc dot gnu.org 2012-10-16 14:55 ` ysrumyan at gmail dot com 2012-10-16 15:06 ` ysrumyan at gmail dot com 2012-10-16 15:32 ` rguenth at gcc dot gnu.org 2013-03-27 11:19 ` rguenth at gcc dot gnu.org 2023-07-21 12:28 ` rguenth at gcc dot gnu.org [this message] 2023-07-21 12:31 ` rguenth 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-54939-4-RUWViAOLeQ@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).