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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/114166] New: word_mode vectorization still
 relies on vector lowering
Date: Thu, 29 Feb 2024 11:43:23 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114166

            Bug ID: 114166
           Summary: word_mode vectorization still relies on vector
                    lowering
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
  Target Milestone: ---

When the vectorizer decides to use emulated vectors for operations the targ=
et
doesn't support and the vector types do not have integer mode but the
vectorizer simply emits vector code nevertheless which it does for
bitwise operations, we fail RTL expansion.

This can be seen with g++.dg/opt/pr82929.C when moving vector lowering
before vectorization.  We then vectorize V1SImode bitwise and even
though the optab check discovered that's not supported.

Vectorizer code generation should, like it now does for PLUS/MINUS and NEGA=
TE,
use integer types when code generating emulated vectors.=