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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/110199] New: [12/13/14 Regression] Missing
 VRP transformation with MIN_EXPR and known relation
Date: Fri, 09 Jun 2023 22:28:13 +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=3D110199

            Bug ID: 110199
           Summary: [12/13/14 Regression] Missing VRP transformation with
                    MIN_EXPR and known relation
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

Take:
```
int test(int a, int b)
{
    if (a <=3D b)
        return a < b ? a : b;
    return 0;
}
```
This used to be optimized in GCC 11 and before via EVRP:

pushing new range for b_3(D): int [a_2(D), +INF]  EQUIVALENCES: { b_3(D) } =
(1
elements)
evrp visiting stmt _5 =3D MIN_EXPR <a_2(D), b_3(D)>;

extract_range_from_stmt visiting:
_5 =3D MIN_EXPR <a_2(D), b_3(D)>;
Intersecting
  int VARYING
and
  int VARYING
to
  int VARYING
Folding statement: _5 =3D MIN_EXPR <a_2(D), b_3(D)>;
Folded into: _5 =3D a_2(D);


But in GCC 12 and above it is missed:
Folding statement: _5 =3D MIN_EXPR <a_2(D), b_3(D)>;
 folding with relation a_2(D) <=3D b_3(D)
Not folded=