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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/107863] [10/11/12/13 Regression] ICE with unrecognizable
 insn when using -funsigned-char with some SSE/AVX builtins
Date: Thu, 01 Dec 2022 03:33:10 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107863

--- Comment #12 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-12 branch has been updated by hongtao Liu
<liuhongt@gcc.gnu.org>:

https://gcc.gnu.org/g:b7306f02da33695bec90f153f6725a51d7c0ac71

commit r12-8954-gb7306f02da33695bec90f153f6725a51d7c0ac71
Author: liuhongt <hongtao.liu@intel.com>
Date:   Mon Nov 28 09:59:47 2022 +0800

    Fix unrecognizable insn due to illegal immediate_operand (const_int 255=
) of
QImode.

    For __builtin_ia32_vec_set_v16qi (a, -1, 2) with
    !flag_signed_char. it's transformed to
    __builtin_ia32_vec_set_v16qi (_4, 255, 2) in the gimple,
    and expanded to (const_int 255) in the rtl. But for immediate_operand,
    it expects (const_int 255) to be signed extended to
    (const_int -1). The mismatch caused an unrecognizable insn error.

    The patch converts (const_int 255) to (const_int -1) in the backend
    expander.

    gcc/ChangeLog:

            PR target/107863
            * config/i386/i386-expand.cc (ix86_expand_vec_set_builtin):
            Convert op1 to target mode whenever mode mismatch.

    gcc/testsuite/ChangeLog:

            * gcc.target/i386/pr107863.c: New test.=