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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/109154] [13/14 regression] jump threading
 de-optimizes nested floating point comparisons
Date: Thu, 09 Nov 2023 14:20:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109154

--- Comment #78 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tamar Christina <tnfchris@gcc.gnu.org=
>:

https://gcc.gnu.org/g:830460d67a10549939602ba323ea3fa65fb7de20

commit r14-5287-g830460d67a10549939602ba323ea3fa65fb7de20
Author: Tamar Christina <tamar.christina@arm.com>
Date:   Thu Nov 9 14:03:04 2023 +0000

    AArch64: Add movi for 0 moves for scalar types [PR109154]

    Following the Neoverse N/V and Cortex-A optimization guides SIMD 0
immediates
    should be created with a movi of 0.

    At the moment we generate an `fmov .., xzr` which is slower and require=
s a
    GP -> FP transfer.

    gcc/ChangeLog:

            PR tree-optimization/109154
            * config/aarch64/aarch64.md (*mov<mode>_aarch64, *movsi_aarch64,
            *movdi_aarch64): Add new w -> Z case.
            * config/aarch64/iterators.md (Vbtype): Add QI and HI.

    gcc/testsuite/ChangeLog:

            PR tree-optimization/109154
            * gcc.target/aarch64/fneg-abs_2.c: Updated.
            * gcc.target/aarch64/fneg-abs_4.c: Updated.
            * gcc.target/aarch64/dbl_mov_immediate_1.c: Updated.=