[llvm-bugs] [Bug 48604] New: Failure to optimize add+or+sub pattern

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48604

            Bug ID: 48604
           Summary: Failure to optimize add+or+sub 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 transformation is done by GCC,
but not by LLVM.

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