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From: "tnfchris at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/113295] [14 Regression] SPEC 2006 416.gamess miscompares
 on Aarch64 when built with -Ofast -march=native -flto
Date: Wed, 21 Feb 2024 10:25:56 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113295

--- Comment #2 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
bisected to

commit g:2f46e3578d45ff060a0a329cb39d4f52878f9d5a
Author: Richard Sandiford <richard.sandiford@arm.com>
Date:   Thu Dec 14 13:46:16 2023 +0000

    aarch64: Improve handling of accumulators in early-ra

    Being very simplistic, early-ra just models an allocno's live range
    as a single interval.  This doesn't work well for single-register
    accumulators that are updated multiple times in a loop, since in

and it still seems to be miscomparing today.=