[llvm-bugs] [Bug 47205] New: Failure to optimize pow(

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https://bugs.llvm.org/show_bug.cgi?id=47205

            Bug ID: 47205
           Summary: Failure to optimize pow(
           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

float f(float x, float n, float m)
{
    return __builtin_powf(x, n) * __builtin_powf(x, m);
}

With -ffast-math, this could be optimized to `__builtin_powf(x, n + m)` (the
same transformation could also be done for other types, of course). This
transformation is done by GCC, but not by LLVM.

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