Comment # 7
on bug 92709
from Matt Arsenault
(In reply to Michel Dänzer from comment #6) > (In reply to Matt Arsenault from comment #5) > > It seems bizarre that an llvm intrinsic would ever be changed to something > > involving a library call. > > I think the exp2 -> ldexpf transform is rather questionable for us anyway, > since we have a native exp2 instruction, isn't it? Maybe we just don't want > to use the LibCallSimplifier pass? The comment at the top of > SimplifyLibCalls.cpp kind of sounds like "this is not the pass you're > looking for"... We do want this. ldexp is a full rate instruction, and exp2 is a quarter rate instruction.
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