public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
From: "guihaoc at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug target/110331] New: ppc64 vec_extract with constant index is suboptimal on P8 Date: Wed, 21 Jun 2023 03:19:41 +0000 [thread overview] Message-ID: <bug-110331-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110331 Bug ID: 110331 Summary: ppc64 vec_extract with constant index is suboptimal on P8 Product: gcc Version: 13.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: guihaoc at gcc dot gnu.org Target Milestone: --- //test.c #include <altivec.h> #ifdef __BIG_ENDIAN__ #define LANE_B 3 #else #define LANE_B 12 #endif unsigned char foo1 (vector unsigned char v) { return vec_extract (v, LANE_B); } Trunk generates: vspltb 2,2,3 mfvsrd 3,34 rlwinm 3,3,0,0xff While it can be optimized as: mfvsrd 3,34 rldicl 3,3,32,56
next reply other threads:[~2023-06-21 3:19 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-06-21 3:19 guihaoc at gcc dot gnu.org [this message] 2023-06-29 8:35 ` [Bug target/110331] " guihaoc 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-110331-4@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).