public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
From: "ramana at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug target/107533] New: Inefficient code sequence for fp16 testcase on aarch64 Date: Sat, 05 Nov 2022 07:42:43 +0000 [thread overview] Message-ID: <bug-107533-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107533 Bug ID: 107533 Summary: Inefficient code sequence for fp16 testcase on aarch64 Product: gcc Version: 13.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: ramana at gcc dot gnu.org Target Milestone: --- Derived from PR92999 struct phalf { __fp16 first; __fp16 second; }; struct phalf phalf_copy(struct phalf* src) __attribute__((noinline)); struct phalf phalf_copy(struct phalf* src) { return *src; } Compiling for AArch64 with a recent enough compiler produces. phalf_copy: ldr w0, [x0] ubfx x1, x0, 0, 16 lsr w0, w0, 16 dup v0.4h, w1 dup v1.4h, w0 ret Couldn't it just be ldr h0, [x0] ldr h1, [x0, 2] IIRC this is in base v8 rather than v8.2 regards Ramana
next reply other threads:[~2022-11-05 7:42 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-11-05 7:42 ramana at gcc dot gnu.org [this message] 2023-05-19 4:12 ` [Bug target/107533] " 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-107533-4@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).