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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/101807] bool0 < bool1 Should expand as !bool0 &bool1
 and bool0 <= bool1 as !bool0 | bool1
Date: Thu, 18 May 2023 19:18:59 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: middle-end
X-Bugzilla-Version: 12.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: pinskia at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101807

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
           Assignee|unassigned at gcc dot gnu.org      |pinskia at gcc dot =
gnu.org
   Last reconfirmed|                            |2023-05-18
             Status|UNCONFIRMED                 |ASSIGNED

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I have a patch.

It even handles:
unsigned f(unsigned a, unsigned b)
{
    if (a > 1) __builtin_unreachable();
    if (b > 1) __builtin_unreachable();
    return a<b;
}


Which gives:
        xorl    $1, %edi
        movl    %edi, %eax
        andl    %esi, %eax=