[llvm-commits] [PATCH] Instcombine: Don't optimize pow(2.0, x) -> exp2(x) if exp2 is unavailable

[Derek Schuff]

Hi,
Attached is a patch to check that exp2 is available using the usual
TLI mechanism before optimizing pow(2.0, x) to exp2(x). This is a
problem if compiling a math library that implements exp2(x) as a call
to pow(2,x).

please review, thanks
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