13 new instructions were introduced in the 90nm Pentium® 4 processor. They are referred to as the SSE3 instruction set. No new registers were introduced. The SSE3 instructions fall into five categories:
One new x87 FP-to-integer conversion instruction:
Complex arithmetic instructions:
One new video encoding instruction:
- the HADDPS, HSUBPS, HADDPD, and HSUBPD instructions. See “Instructions ...