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From: "rth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/94543] New: missed optimization with MIN and AND
 with type promotion
Date: Thu, 09 Apr 2020 19:13:01 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94543

            Bug ID: 94543
           Summary: missed optimization with MIN and AND with type
                    promotion
           Product: gcc
           Version: tree-ssa
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rth at gcc dot gnu.org
  Target Milestone: ---

unsigned f(unsigned short x) { return (x > 0xff ? 0xff : x) & 0xff; }

        cmpw    $255, %di
        movl    $255, %eax
        cmova   %eax, %edi
        movzwl  %di, %eax
        ret

The final AND is of course redundant.  The optimizer removes it
for wider types, but fails to do so when promoting from short.=