[Bug target/112476] Unrecognizable insn with -O2 -march=la464 on loongarch64

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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112476

--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Xi Ruoyao <xry111@gcc.gnu.org>:

https://gcc.gnu.org/g:b88500e0bc1e9e3a396ba764f9b701d22a76818f

commit r14-5374-gb88500e0bc1e9e3a396ba764f9b701d22a76818f
Author: Xi Ruoyao <xry111@xry111.site>
Date:   Sun Nov 12 00:55:13 2023 +0800

    LoongArch: Use simplify_gen_subreg instead of gen_rtx_SUBREG in
loongarch_expand_vec_cond_mask_expr [PR112476]

    GCC internal says:

        'subreg's of 'subreg's are not supported.  Using
        'simplify_gen_subreg' is the recommended way to avoid this problem.

    Unfortunately loongarch_expand_vec_cond_mask_expr might create nested
    subreg under certain circumstances, causing an ICE.

    Use simplify_gen_subreg as the internal document suggests.

    gcc/ChangeLog:

            PR target/112476
            * config/loongarch/loongarch.cc
            (loongarch_expand_vec_cond_mask_expr): Call simplify_gen_subreg
            instead of gen_rtx_SUBREG.

    gcc/testsuite/ChangeLog:

            PR target/112476
            * gcc.target/loongarch/pr112476-1.c: New test.
            * gcc.target/loongarch/pr112476-2.c: New test.