SSE4.2 consists of 7 instructions that improve performance of text
processing and some application-specific operations:
- 4 String and text processing instructions
- 1 instruction used for comparison of packed integer quadwords
- 2 application-targeted accelerator (ATA) instructions:
- CRC32 - calculates cyclic redundancy check of a block of data
- POPCNT - improves searching of bit patterns
SSE4.2 is the second part of SSE4
instruction set. SSE4.2 was first introduced in Intel Nehalem core
in November 2008. At this time (November 2008) there are no AMD
processors supporting SSE4.2 instructions.
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