hfinkel added a comment.
> (IEEEdouble, IEEEdouble) -> (uint64_t, uint64_t) -> PPCDoubleDoubleImpl, then
> run the old algorithm.
We need to document in the code what is going on here and why it works. Just
looking at a bunch of code like this:
if (Semantics == &semPPCDoubleDouble) {
APFloat Tmp(semPPCDoubleDoubleImpl, bitcastToAPInt());
auto Ret = Tmp.next(nextDown);
*this = DoubleAPFloat(semPPCDoubleDouble, Tmp.bitcastToAPInt());
return Ret;
}
it is not at all obvious what is going on (i.e. why are we casting to
integers?). Maybe semPPCDoubleDoubleImpl needs a better name now? It seems
confusing to have semPPCDoubleDoubleImpl and semPPCDoubleDouble where one is
not really an "implementation" class of the other.
================
Comment at: llvm/include/llvm/ADT/APFloat.h:791
void makeNaN(bool SNaN, bool Neg, const APInt *fill) {
- getIEEE().makeNaN(SNaN, Neg, fill);
+ if (usesLayout<IEEEFloat>(getSemantics()))
+ return U.IEEE.makeNaN(SNaN, Neg, fill);
----------------
I realize that some of this existed before, but is there any way to refactor
this so that we don't have so much boiler plate? Even using a utility macro is
probably better than this.
https://reviews.llvm.org/D27872
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