[llvm-bugs] [Bug 46375] New: Failure to optimize comparisons witht numbers after comparison with 0 to unsigned comparison when there are multiple of them

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46375

            Bug ID: 46375
           Summary: Failure to optimize comparisons witht numbers after
                    comparison with 0 to unsigned comparison when there
                    are multiple of them
           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

bool f(int a, int b)
{
    return a >= 0 && b >= 0 && a < 8 && b < 8;
}

This can be optimized to `return (unsigned)a < 8 && (unsigned)b < 8;` (and
further to `(unsigned)(a | b) < 8`). This transformation is done by GCC, but
not by LLVM.

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