[llvm-bugs] [Bug 47594] New: Failure to optimize and+not pattern

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47594

            Bug ID: 47594
           Summary: Failure to optimize and+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 f(int a, int b)
{
    return (a ^ b) | ~(a | b);
}

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

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

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