[llvm-bugs] [Bug 48978] New: Failure to simplify somewhat complicated combination of comparisons

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48978

            Bug ID: 48978
           Summary: Failure to simplify somewhat complicated combination
                    of comparisons
           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(unsigned a, unsigned b)
{
    return (b != 0) & (a >= b);
}

This can be optimized to `return (b - 1) < a;`. This transformation is done by
GCC, but not LLVM.

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