public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
From: "glisse at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/55152] New: MAX_EXPR(a,-a) is really ABS_EXPR(a) Date: Wed, 31 Oct 2012 20:17:00 -0000 [thread overview] Message-ID: <bug-55152-4@http.gcc.gnu.org/bugzilla/> (raw) http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55152 Bug #: 55152 Summary: MAX_EXPR(a,-a) is really ABS_EXPR(a) Classification: Unclassified Product: gcc Version: 4.8.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: middle-end AssignedTo: unassigned@gcc.gnu.org ReportedBy: glisse@gcc.gnu.org I tried compiling this code with -Ofast, but *.optimized still only contained a MAX_EXPR and not an ABS_EXPR (the back-end didn't find the optimization either). double f(double a){ return (a>=-a)?a:-a; } It seems that some simple code in fold-const.c could help (fold is called from the front-end for COND_EXPR), not sure if anything would call it if -a went though a temporary variable though.
next reply other threads:[~2012-10-31 20:17 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-10-31 20:17 glisse at gcc dot gnu.org [this message] 2012-10-31 20:19 ` [Bug middle-end/55152] " pinskia at gcc dot gnu.org 2012-10-31 21:14 ` glisse at gcc dot gnu.org 2012-10-31 21:27 ` glisse at gcc dot gnu.org 2012-12-09 3:02 ` pinskia at gcc dot gnu.org 2013-07-14 10:31 ` glisse 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-55152-4@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).