[Bug math/33623] [ldbl-128ibm] roundl, ceill, truncl, floorl bad sign of zero results

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=33623

--- Comment #3 from Sourceware Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Aurelien Jarno <aurel32@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=6f4b28b20aa9161aeb42a7f34f4d3b96194e5666

commit 6f4b28b20aa9161aeb42a7f34f4d3b96194e5666
Author: Aurelien Jarno <aurelien@aurel32.net>
Date:   Tue Jan 20 18:25:08 2026 +0100

    Fix ldbl-128ibm ceill, floorl, roundl and truncl zero-sign handling

    When the result of ceill, floorl, roundl and truncl is zero, the sign of
    the result must match the sign of the input. For the IBM 128-bit long
    double format, the sign is determined by the high part.

    Ensure the correct sign when the high part is the result of
    computations, by copying the sign from the input high part to the output
    high part. On POWER, this conveniently maps to the fcpsgn instruction.

    In addition add test for the values provided in BZ #33623, and for the
    opposite value when the result is 0.

    Fixes: BZ #33623

    Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

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