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Subject: [Bug middle-end/106030] [13 Regression] ice in emit_move_insn, at
 expr.cc:4026
Date: Wed, 03 May 2023 15:18:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106030

--- Comment #11 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Jakub Jelinek
<jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:89741783f6e7127d4d8be5a5e8e4fb7d5785f8a6

commit r10-11332-g89741783f6e7127d4d8be5a5e8e4fb7d5785f8a6
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Tue Jun 21 11:38:59 2022 +0200

    expand: Fix up expand_cond_expr_using_cmove [PR106030]

    If expand_cond_expr_using_cmove can't find a cmove optab for a particul=
ar
    mode, it tries to promote the mode and perform the cmove in the promoted
    mode.

    The testcase in the patch ICEs on arm because in that case we pass temp
which
    has the promoted mode (SImode) as target to expand_operands where the
    operands have the non-promoted mode (QImode).
    Later on the function uses paradoxical subregs:
      if (GET_MODE (op1) !=3D mode)
        op1 =3D gen_lowpart (mode, op1);

      if (GET_MODE (op2) !=3D mode)
        op2 =3D gen_lowpart (mode, op2);
    to change the operand modes.

    The following patch fixes it by passing NULL_RTX as target if it has
    promoted mode.

    2022-06-21  Jakub Jelinek  <jakub@redhat.com>

            PR middle-end/106030
            * expr.c (expand_cond_expr_using_cmove): Pass NULL_RTX instead =
of
            temp to expand_operands if mode has been promoted.

            * gcc.c-torture/compile/pr106030.c: New test.

    (cherry picked from commit 2df1df945fac85d7b3d084001414a66a2709d8fe)=