SIMD

x86

• AVX (Advanced Vector eXtensions) -- to be introduced on Intel's Sandy Bridge (2010) and AMD's Bulldozer (2011), and implemented within the VEX coding scheme

SSE3

movddup -- move a double from a 8-byte-aligned memory location or lower half of XMM register to upper half, then duplicate upper half to lower half

SSE2

• movapd -- move two packed doubles from a 16-byte-aligned memory location to XMM registers, or vice versa, or between two XMM registers.
• mulpd -- the multiplier is a 16-byte-aligned memory location or XMM register. the target XMM register serves as the multiplicand.

Fused Multiply-Add

• The FMA instruction set extension to x86 should hit around 2011

Other Architectures

• PowerPC implements AltiVec

See Also

• "Why no FMA in AVX in Sandy Bridge?", Intel Developers Forum
• SSE5 guide at AMD