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AMD x86-64 Architecture Programmer's Manual, Volume 4, 128-Bit ...

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<strong>AMD</strong><strong>64</strong> Technology 26568—Rev. 3.05—September 2003<br />

PSLLD Packed Shift Left Logical Doublewords<br />

Left-shifts each of the packed 32-bit values in the first source operand by the number<br />

of bits specified in the second source operand and writes each shifted value in the<br />

corresponding doubleword of the destination (first source). The first<br />

source/destination and second source operands are:<br />

� an XMM register and another XMM register or <strong>128</strong>-bit memory location, or<br />

� an XMM register and an immediate byte value.<br />

The low-order bits that are emptied by the shift operation are cleared to 0. If the shift<br />

value is greater than 31, the destination is cleared to all 0s.<br />

Mnemonic Opcode Description<br />

PSLLD xmm1, xmm2/mem<strong>128</strong> 66 0F F2 /r Left-shifts packed doublewords in an XMM register by the<br />

amount specified in the low <strong>64</strong> bits of an XMM register or<br />

<strong>128</strong>-bit memory location.<br />

PSLLD xmm, imm8 66 0F 72 /6 ib Left-shifts packed doublewords in an XMM register by the<br />

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

shift left<br />

xmm1 xmm2/mem<strong>128</strong><br />

127 96 95 <strong>64</strong> 63 32 31<br />

0<br />

shift left<br />

.<br />

.<br />

.<br />

shift left<br />

xmm imm8<br />

127 96 95 <strong>64</strong> 63 32 31<br />

0<br />

.<br />

286 PSLLD<br />

.<br />

.<br />

.<br />

.<br />

shift left<br />

127 <strong>64</strong> 63 0<br />

7 0<br />

pslld-<strong>128</strong>.eps

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