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Subject: [Bug target/102498] [9/10/11/12 Regression] Long double constant and
 non-default rounding mode on x86
Date: Tue, 28 Sep 2021 11:03:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102498

--- Comment #8 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:3b7041e8345c2f1030e58620f28e22d64b2c196b

commit r12-3920-g3b7041e8345c2f1030e58620f28e22d64b2c196b
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Tue Sep 28 13:02:51 2021 +0200

    i386: Don't emit fldpi etc. if -frounding-math [PR102498]

    i387 has instructions to store some transcedental numbers into the top =
of
    stack.  The problem is that what exact bit in the last place one gets f=
or
    those depends on the current rounding mode, the CPU knows the number wi=
th
    slightly higher precision.  The compiler assumes rounding to nearest wh=
en
    comparing them against constants in the IL, but at runtime the rounding
    can be different and so some of these depending on rounding mode and the
    constant could be 1 ulp higher or smaller than expected.
    We only support changing the rounding mode at runtime if the non-default
    -frounding-mode option is used, so the following patch just disables
    using those constants if that flag is on.

    2021-09-28  Jakub Jelinek  <jakub@redhat.com>

            PR target/102498
            * config/i386/i386.c (standard_80387_constant_p): Don't recogni=
ze
            special 80387 instruction XFmode constants if flag_rounding_mat=
h.

            * gcc.target/i386/pr102498.c: New test.=