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This is an optimization manual for advanced assembly language programmers and compiler makers. Topics include: C++ instrinsic functions, inline assembly and stand-alone assembly. Linking optimized assembly subroutines into high level language programs. Making subroutine libraries compatible with multiple compilers and operating systems. Optimizing for speed or size. Memory access. Loops. Vector programming (XMM, YMM, SIMD). CPU-specific optimization and CPU dispatching.