MMX instruction to shift a register's contents right, 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. 0's are shifted in from the bit bucket to fill the new spaces on the left side.

Compare: PSRLQ, PSRLD, PSRAW, PSLLW.

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