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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug target/67510] x86: Faster code is possible for integer absolute value Date: Mon, 14 Sep 2015 11:20:00 -0000 [thread overview] Message-ID: <bug-67510-4-qwyLpm7U8a@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-67510-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67510 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |missed-optimization Status|UNCONFIRMED |NEW Last reconfirmed| |2015-09-14 Ever confirmed|0 |1 --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- Confirmed. x86 doesn't have integer abs patterns it seems and we end up using expand_abs_nojump()s /* If this machine has expensive jumps, we can do integer absolute value of X as (((signed) x >> (W-1)) ^ x) - ((signed) x >> (W-1)), where W is the width of MODE. */
next prev parent reply other threads:[~2015-09-14 11:20 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-09-09 7:55 [Bug target/67510] New: " peter at cordes dot ca 2015-09-14 11:20 ` rguenth at gcc dot gnu.org [this message] 2021-07-26 23:44 ` [Bug target/67510] x86: " pinskia at gcc dot gnu.org 2024-03-07 22:06 ` pcordes at gmail dot com
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