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From: "gabravier at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/94786] New: Missed min/max pattern using
 xor+and+less
Date: Mon, 27 Apr 2020 08:11:06 +0000
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X-Bugzilla-Component: tree-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94786

            Bug ID: 94786
           Summary: Missed min/max pattern using xor+and+less
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gabravier at gmail dot com
  Target Milestone: ---

int r1(int x, int y)
{
    return y ^ ((x ^ y) & -(x < y));
}

int r2(int x, int y)
{
    return x ^ ((x ^ y) & -(x < y));
}

`r1` can be optimized to `min` and `r2` to `max`. This transformation is do=
ne
by LLVM, but not by GCC.

Comparison here: https://godbolt.org/z/hNhkqM=