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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/94591] [8/9/10/11 Regression] Assembler messages: Error:
 operand mismatch -- `rev64 v0.2d,v0.2d' (or `rev32 v0.2s,v0.2s')
Date: Fri, 29 May 2020 13:23:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94591

--- Comment #8 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-8 branch has been updated by Alex Coplan
<acoplan@gcc.gnu.org>:

https://gcc.gnu.org/g:b64ec9c3eea5204b90936e332704e6f57470f6e5

commit r8-10285-gb64ec9c3eea5204b90936e332704e6f57470f6e5
Author: Alex Coplan <alex.coplan@arm.com>
Date:   Fri May 29 14:23:02 2020 +0100

    aarch64: PR target/94591: Don't generate invalid REV64 insns

    This fixes PR94591. The problem was the function
    aarch64_evpc_rev_local() matching vector permutations that were not
    reversals. In particular, prior to this patch, this function matched the
    identity permutation which led to generating bogus REV64 insns which
    were rejected by the assembler.

    gcc/
            PR target/94591
            * config/aarch64/aarch64.c (aarch64_evpc_rev_local): Don't match
            identity permutation.

    gcc/testsuite/
            PR target/94591
            * gcc.c-torture/execute/pr94591.c: New test.

    (cherry picked from commit 98452668d362bb9e6358f7eb5cff69f4f5ab1d45)=