[llvm-bugs] [Bug 41337] New: ctpop/popcount missing folds

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41337

            Bug ID: 41337
           Summary: ctpop/popcount missing folds
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: david.bolvansky at gmail.com
                CC: llvm-bugs at lists.llvm.org

unsigned popcount_bitrev(unsigned x) {
    unsigned a = __builtin_bitreverse32(x);
    return __builtin_popcount(a);
}

Since popcount returns number of set bits, we can simplify it to popcount(x).
Same for bswap, I think.

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