[llvm-bugs] [Bug 48669] New: Failure to optimize modulo pattern made from division optimally

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48669

            Bug ID: 48669
           Summary: Failure to optimize modulo pattern made from division
                    optimally
           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

__INT64_TYPE__ f(__INT32_TYPE__ x, __INT32_TYPE__ y)
{
    return (__INT64_TYPE__)y - (y / x) * x;
}

This example (and most likely also a more generic form) can be optimized into
`return y % x;`. This transformation is done by GCC, but not by LLVM.

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