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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/112752] `~a - MIN<MIN<~a, ~b>, ~c>` is not
 optimized to `MAX<MAX<a,b>,c> - a`
Date: Tue, 28 Nov 2023 23:01:02 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: missed-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112752

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Here is a semi-reduced testcase:
```
#define byte unsigned char
#define MIN(a, b) ((a) > (b)?(b):(a))

byte hh(byte r, byte g, byte b) {
  byte c =3D 255 - r;
  byte m =3D 255 - g;
  byte y =3D 255 - b;
  byte tmp =3D MIN(m, y);
  byte k =3D MIN(c, tmp);
  return m - k;
}
```
Note matching this directly, the above might not fix the original testcase.=