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AMD 64-Bit Technology - ECE User Home Pages

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26568—Rev. 3.02—August 2002<br />

<strong>AMD</strong> <strong>64</strong>-<strong>Bit</strong> <strong>Technology</strong><br />

PSRLDQ<br />

Packed Shift Right Logical Double Quadword<br />

Right-shifts the 128-bit (double quadword) value in an XMM register by the number of<br />

bytes specified in an immediate byte value. The high-order bytes that are emptied by<br />

the shift operation are cleared to 0. If the shift value is greater than 15, the<br />

destination XMM register is cleared to all 0s.<br />

Mnemonic Opcode Description<br />

PSRLDQ xmm, imm8 66 0F 73 /3 ib Right-shifts double quadword value in an XMM register by the<br />

amount specified in an immediate byte value.<br />

xmm<br />

127 0<br />

imm8<br />

7 0<br />

shift right<br />

psrldq.eps<br />

Related Instructions<br />

PSLLD, PSLLDQ, PSLLQ, PSLLW, PSRAD, PSRAW, PSRLD, PSRLQ, PSRLW<br />

rFLAGS Affected<br />

None<br />

MXCSR Flags Affected<br />

None<br />

PSRLDQ 301

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