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 target/65832] Inefficient vector construction Date: Tue, 21 Apr 2015 14:11:00 -0000 [thread overview] Message-ID: <bug-65832-4-qrhEFLr2ij@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-65832-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65832 --- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> --- typedef unsigned char v16qi __attribute__((vector_size(16))); v16qi baz (int i0, int i1, int i2, int i3, int i10, int i11, int i12, int i13, int i20, int i21, int i22, int i23, int i30, int i31, int i32, int i33) { return (v16qi) { i0, i1, i2, i3, i10, i11, i12, i13, i20, i21, i22, i23, i30, i31, i32, i33 }; } is even more "funny". I'm looking whether the vectorizer cost model for these vector constructors make sense. Currently the cost is case vec_construct: elements = TYPE_VECTOR_SUBPARTS (vectype); return ix86_cost->vec_stmt_cost * (elements / 2 + 1); which for v16qi and generic would be 9 vector stmts. The assembly for the above contains 47 instructions. Not sure where elements / 2 + 1 comes from.
next prev parent reply other threads:[~2015-04-21 14:11 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-04-21 13:56 [Bug target/65832] New: " rguenth at gcc dot gnu.org 2015-04-21 14:03 ` [Bug target/65832] " rguenth at gcc dot gnu.org 2015-04-21 14:11 ` rguenth at gcc dot gnu.org [this message] 2015-04-28 8:51 ` rguenth at gcc dot gnu.org 2015-04-28 8:55 ` rguenth at gcc dot gnu.org 2015-05-22 12:15 ` rguenth at gcc dot gnu.org 2015-06-01 10:30 ` rguenth at gcc dot gnu.org 2020-06-24 20:45 ` [Bug middle-end/65832] " gabravier at gmail dot com
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-65832-4-qrhEFLr2ij@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).