MMX instruction to shift a register's contents right arithmetically, word-wise.

The source is either an immediate 8 bit value, a 64 bit value in memory, or a MMX register. The destination is a MMX register. Each word of the destination is shifted to the right by the number of bits specified in the source.
Unlike logical shifts (PSRLW), 0's are NOT shifted in - instead, the leftmost (sign) bit of each word is used to fill the space.


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