[llvm-bugs] [Bug 46160] New: Failure to optimize out redundant compare

via llvm-bugs llvm-bugs at lists.llvm.org
Mon Jun 1 09:37:23 PDT 2020


            Bug ID: 46160
           Summary: Failure to optimize out redundant compare
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: gabravier at gmail.com
                CC: llvm-bugs at lists.llvm.org

bool f(int a, int b, int c)
    return (a == b) && (b == c) && (a == c);

This can be optimized to `return (a == b) && (a == c);`. GCC does this
transformation, but LLVM does not.

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