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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/114402] rs6000: ICE when long double is ieee128 format
 by default but without vsx
Date: Tue, 21 May 2024 02:02:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114402

--- Comment #2 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Kewen Lin <linkw@gcc.gnu.org>:

https://gcc.gnu.org/g:c547e353597ac4e0af09c2faca8c5a16744dcea4

commit r15-702-gc547e353597ac4e0af09c2faca8c5a16744dcea4
Author: Kewen Lin <linkw@linux.ibm.com>
Date:   Mon May 20 21:01:06 2024 -0500

    rs6000: Fix ICE on IEEE128 long double without vsx [PR114402]

    As PR114402 shows, we supports IEEE128 format long double
    even if there is no vsx support, but there is an ICE about
    cbranch as the test case shows.  For now, we only supports
    compare:CCFP pattern for IEEE128 fp if TARGET_FLOAT128_HW,
    so in function rs6000_generate_compare we have a check with
    !TARGET_FLOAT128_HW && FLOAT128_VECTOR_P (mode) to make
    !TARGET_FLOAT128_HW IEEE128 fp handling go with libcall.
    But unfortunately the IEEE128 without vsx support doesn't
    meet FLOAT128_VECTOR_P (mode) so it goes further with an
    unmatched compare:CCFP pattern which triggers ICE.

    So this patch is to make rs6000_generate_compare consider
    IEEE128 without vsx as well then it can end up with libcall.

            PR target/114402

    gcc/ChangeLog:

            * config/rs6000/rs6000.cc (rs6000_generate_compare): Make IEEE1=
28
            handling without vsx go with libcall.

    gcc/testsuite/ChangeLog:

            * gcc.target/powerpc/pr114402.c: New test.=