[Bug target/94292] [10 Regression] ICE: SIGSEGV in forward_propagate_and_simplify (fwprop.c:1417) with -O -g -fno-tree-dce since r10-3985-g8b8ab8f473b42933b9c1e292c4b1ab02adf1863a

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94292

--- Comment #3 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:6e4cd3cd259af2b5e04986a3f2222528a4f9f762

commit r10-7382-g6e4cd3cd259af2b5e04986a3f2222528a4f9f762
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Wed Mar 25 19:06:45 2020 +0100

    arm: Fix ICE caused by arm_gen_dicompare_reg [PR94292]

    The following testcase ICEs, because arm_gen_dicompare_reg creates invalid
    RTL which then propagates into DEBUG_INSNs and ICEs while handling them.
    The problem is that this function emits
    (insn 18 17 19 2 (set (reg:CC_DNE 100 cc)
            (compare (ior:SI (ne:SI (subreg:SI (reg:DI 129) 0)
                        (subreg:SI (reg:DI 114 [ _2 ]) 0))
                    (ne:SI (subreg:SI (reg:DI 129) 4)
                        (subreg:SI (reg:DI 114 [ _2 ]) 4)))
                (const_int 0 [0]))) "pr94292.c":7:11 325 {*cmp_ior}
         (nil))
    and the invalid thing is that the COMPARE has VOIDmode.  Setting a
    non-VOIDmode SET_DEST to VOIDmode SET_SRC is only valid if the SET_SRC is
    CONST_INT/CONST_DOUBLE.
    The following patch fixes it by giving the COMPARE the same mode as it
gives
    to the SET_DEST cc register.

    2020-03-25  Jakub Jelinek  <jakub@redhat.com>

            PR target/94292
            * config/arm/arm.c (arm_gen_dicompare_reg): Set mode of COMPARE to
            mode rather than VOIDmode.

            * gcc.dg/pr94292.c: New test.