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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/99930] Failure to optimize floating point -abs(x) in nontrivial code at -O2/3 Date: Thu, 08 Apr 2021 22:46:55 +0000 [thread overview] Message-ID: <bug-99930-4-ZBU1kpBsnr@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-99930-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99930 --- Comment #10 from Segher Boessenkool <segher at gcc dot gnu.org> --- That is a USE of a constant, which is a no-op always. Here we have a USE of a register, which is not. We actually have *two* uses of pseudos, and combine cannot know what that means for the target (all PARALLELs are split up in combine).
next prev parent reply other threads:[~2021-04-08 22:46 UTC|newest] Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-04-06 10:38 [Bug target/99930] New: " core13 at gmx dot net 2021-04-06 11:57 ` [Bug rtl-optimization/99930] " rguenth at gcc dot gnu.org 2021-04-06 12:00 ` rguenth at gcc dot gnu.org 2021-04-06 17:31 ` segher at gcc dot gnu.org 2021-04-07 10:04 ` jakub at gcc dot gnu.org 2021-04-07 10:06 ` jakub at gcc dot gnu.org 2021-04-07 10:14 ` ubizjak at gmail dot com 2021-04-07 10:27 ` crazylht at gmail dot com 2021-04-07 16:32 ` segher at gcc dot gnu.org 2021-04-08 9:48 ` crazylht at gmail dot com 2021-04-08 22:46 ` segher at gcc dot gnu.org [this message] 2021-07-25 1:30 ` pinskia at gcc dot gnu.org 2023-12-24 23:16 ` [Bug middle-end/99930] " pinskia at gcc dot gnu.org
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