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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/106586] riscv32 still broke with zba_zbb_zbc_zbs, ICE in
 do_SUBST in C++ code
Date: Mon, 15 Aug 2022 21:37:29 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106586

--- Comment #10 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
There is still some missing sign extend of the const_int.
(insn 17 16 18 4 (set (reg:SI 77)
        (mem/u/c:SI (lo_sum:SI (reg/f:SI 78)
                (symbol_ref/u:SI ("*.LC0") [flags 0x82])) [0  S4 A32]))
"t89.c":5:16 140 {*movsi_internal}
     (expr_list:REG_DEAD (reg/f:SI 78)
        (expr_list:REG_EQUAL (const_int 2147483648 [0x80000000])
            (nil))))


Notice the REG_EQUAL.

I think the issue is inside riscv_build_integer_1.

Specifically this:
      alt_cost =3D 1 + riscv_build_integer_1 (alt_codes, value - low_part, =
mode);=