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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/114213] New: `MIN<MAX<a,-CST>, CST> / CST` -> `a >= CST ? 1  : -(a <= -CST)`
Date: Sat, 02 Mar 2024 23:56:35 +0000	[thread overview]
Message-ID: <bug-114213-4@http.gcc.gnu.org/bugzilla/> (raw)

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114213

            Bug ID: 114213
           Summary: `MIN<MAX<a,-CST>, CST> / CST` -> `a >= CST ? 1  : -(a
                    <= -CST)`
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

Take:
```
int f(int a)
{
        a = a <= -64 ? -64 : a;
        a = a >= 64 ? 64 : a;
        return a/64;
}

int f1(int a)
{
  return a >= 64 ? 1  : -(a <= -64);
}
int f2(int a)
{
  return a <= -64 ? -1  : (a >= 64);
}
```
These all three should produce the same result.

This is basically the expanded version of PR 114212 on to the negative side.

                 reply	other threads:[~2024-03-02 23:56 UTC|newest]

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