[llvm-bugs] [Bug 47593] New: Failure to optimize bitwise not pattern

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47593

            Bug ID: 47593
           Summary: Failure to optimize bitwise not pattern
           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

int f1(int a, int b)
{
    return ~(a | b) | (~a & b);
}

This can be optimized to `return ~a;`. This optimization is done by GCC, but
not by LLVM.

See also comparison here : https://godbolt.org/z/vqTW4a

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