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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/101044] -ABS(A) produces two neg instructions
Date: Tue, 29 Jun 2021 09:38:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101044

Uro=C5=A1 Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2021-06-29
     Ever confirmed|0                           |1
           Assignee|unassigned at gcc dot gnu.org      |ubizjak at gmail do=
t com
             Status|UNCONFIRMED                 |ASSIGNED

--- Comment #2 from Uro=C5=A1 Bizjak <ubizjak at gmail dot com> ---
Created attachment 51080
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D51080&action=3Dedit
Proposed patch

Patch introduces nabs patterns where we reverse the condition of the cmove.

The compilation results in:

        movl    %edi, %eax
        negl    %eax
        cmovns  %edi, %eax=