Add FP primitives to take advantage of SSE2 intrinsics #142
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These were replaced by implementations in C++ some months ago, in order to take advantage of newer FP instructions from SSE2, etc.
Many of the FP operations call the CRT via external calls from the image. This decision was trading off performance against having to maintain a large number of FP primitives written in assembler. Now that the FP primitives can be written efficiently in C++, there is no reason not to add primitives for the common mathematical functions.
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