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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/115176] New: rbit pattern should use bitreverse rtl now
Date: Tue, 21 May 2024 15:19:18 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 15.0
X-Bugzilla-Keywords: internal-improvement
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: pinskia at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115176

            Bug ID: 115176
           Summary: rbit pattern should use bitreverse rtl now
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Keywords: internal-improvement
          Severity: enhancement
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

While looking at some code I noticed that it uses clang's __builtin_bitreve=
rse8
builtin and looking at the aarch64 backend, I noticed the rbit patterns don=
't
use bitreverse but still an UNSPEC.

We should be able to change the pattern to use the rtl now.=