agutowski added inline comments.
> CGBuiltin.cpp:2665
> + BasicBlock *End = createBasicBlock("bitscan_end", this->CurFn);
> + Builder.SetInsertPoint(End);
> + PHINode *Result = Builder.CreatePHI(ResultType, 2, "bitscan_result");
Is this line needed? I took it from __builtin_fpclassify, but I don't know what
could be its purpose (it's repeated below, where the "bitscan_end" block really
starts).
https://reviews.llvm.org/D25264
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