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Just want to know what does #pragma intrinsic(_m_prefetchw) mean ?
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As far as I am aware, that looks like someone was intending to modify some MSVC++ specific setting. However, that setting is not a valid option for the intrinsic pragma. _m_prefetchw on the other hand is a 3D Now! intrinsic function.
Like all compiler intrinsic functions, it exposes (possibly) faster assembly instructions supported by the underlying hardware to your C or C++ application in a manner
A. more consistent with optimizers, and
B. more consistent with the language, when compared with using inline assembly.
On MSVC on x86_64/x64/amd64 systems, inline assembly is not supported, so one must use such intrinsics to access whizzbang features of the underlying hardware.
Finally, it should be noted that _m_prefetchw is a 3D Now! intrinsic, and 3D Now! is only supported on AMD hardware. It's probably not something you want to use for new code (i.e. you should use SSE instead, which works on both Intel and AMD hardware, and has more features to boot).
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