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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/107269] wrong code at -O1 and above with
 "-fno-tree-ccp" on x86_64-linux-gnu
Date: Tue, 18 Oct 2022 03:31:10 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107269

--- Comment #6 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to Hongtao.liu from comment #3)
> Looks like the same issue as PR107172 since below change can also pass all
> the
> testcase in the PR.
>=20
> diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
> index 8e847520491..be815341af5 100644
> --- a/gcc/config/i386/i386.md
> +++ b/gcc/config/i386/i386.md
> @@ -21335,7 +21335,7 @@ (define_insn "*x86_mov<mode>cc_0_m1_neg"
>  (define_expand "x86_mov<mode>cc_0_m1_neg"
>    [(parallel
>      [(set (match_operand:SWI48 0 "register_operand")
> -         (neg:SWI48 (ltu:SWI48 (reg:CCC FLAGS_REG) (const_int 0))))
> +         (neg:SWI48 (ltu:SWI48 (reg:CC FLAGS_REG) (const_int 0))))
>       (clobber (reg:CC FLAGS_REG))])])
>=20
>  (define_split

Sorry, my patch against an older gcc before the guilty commit, and I compare
the result between it and latest GCC, that's why it show the patch pass the
testcase.=