Wikipedia covers the basics of Intel's SSE instruction set:
http://en.wikipedia.org/wiki/Streaming_SIMD_Extensions
In 2011, SSE5 will be released and Intel is introducing a new AVX SIMD instruction set featuring 256-bit registers and data paths presumably for double precision float vectors.
When it comes to writing SIMD code, using intrinsics can make programming for these enhanced instruction sets simpler and less error prone than using asm blocks.
http://www.codeproject.com/KB/recipes/sseintro.aspx
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