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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/94921] Failure to optimize nots with sub into single add
Date: Mon, 04 May 2020 08:44:52 +0000 [thread overview]
Message-ID: <bug-94921-4-tCVx6xsHUs@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-94921-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94921
Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2020-05-04
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
--- Comment #2 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Marc Glisse from comment #1)
> x + y ?
Correct.
llvm:
leal (%rdi,%rsi), %eax
retq
gcc:
notl %edi
subl %esi, %edi
movl %edi, %eax
notl %eax
ret
Confirmed, looks like a job for a tree combiner.
next prev parent reply other threads:[~2020-05-04 8:44 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-02 12:39 [Bug tree-optimization/94921] New: " gabravier at gmail dot com
2020-05-02 13:09 ` [Bug tree-optimization/94921] " glisse at gcc dot gnu.org
2020-05-04 8:44 ` ubizjak at gmail dot com [this message]
2020-05-05 11:44 ` jakub at gcc dot gnu.org
2020-05-05 15:07 ` jakub at gcc dot gnu.org
2020-05-06 9:20 ` cvs-commit at gcc dot gnu.org
2020-05-06 9:22 ` jakub at gcc dot gnu.org
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