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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/114902] [14/15 Regression] wrong code at -O3
 with "-fno-tree-vrp -fno-expensive-optimizations -fno-tree-dominator-opts" on
 x86_64-linux-gnu
Date: Wed, 01 May 2024 05:29:42 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114902

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #4)
> here is a reduced testcase:

> Note ` -O1 -fno-tree-fre -fno-tree-forwprop -fno-tree-ccp=20
> -fno-tree-dominator-opts`


This testcase is broken in GCC 13 for mips64-linux-gnu with the added option
-march=3Docteon.
And it has been broken since at least 4.9.4.
        andi    $4,$4,0x1
        xori    $4,$4,0x1
        teq     $4,0
        j       $31
        move    $2,$0

That is:
$4 =3D $4 & 0x1
$4 =3D $4 ^ 1
trapif $4 =3D=3D 0

That is the earliest compiler version I could test where I Know that
sign_extract shows up in RTL.=