[llvm-bugs] [Bug 45866] New: Failure to optimize combined bitfield tests properly

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45866

            Bug ID: 45866
           Summary: Failure to optimize combined bitfield tests properly
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Support Libraries
          Assignee: unassignedbugs at nondot.org
          Reporter: gabravier at gmail.com
                CC: llvm-bugs at lists.llvm.org

struct s
{
    int a : 1;
    int b : 1;
    int c : 1;
};

bool f(s x)
{
    return x.a && x.b && !x.c;
}

This can be converted to `(x & 7) == 3` (after conversion to `uint8_t`). GCC
does this transformation, but LLVM does not.

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