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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 />

UNPCKLPD Unpack Low Double-Precision Floating-Point<br />

Unpacks the low-order double-precision floating-point values in the first and second<br />

source operands and packs them into the destination (first source). The value from the<br />

first source operand is packed into the low-order quadword of the destination, and the<br />

value from the second source operand is packed into the high-order quadword of the<br />

destination. The high-order quadwords of the source operands are ignored. The first<br />

source/destination operand is an XMM register. The second source operand is another<br />

XMM register or <strong>128</strong>-bit memory location.<br />

Mnemonic Opcode Description<br />

UNPCKLPD xmm1, xmm2/mem<strong>128</strong> 66 0F 14 /r Unpacks low-order double-precision floating-point values<br />

in an XMM register and another XMM register or <strong>128</strong>-bit<br />

memory location and packs them into the destination XMM<br />

register.<br />

Related Instructions<br />

UNPCKHPD, UNPCKHPS, UNPCKLPS<br />

rFLAGS Affected<br />

None<br />

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

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

392 UNPCKLPD<br />

127<br />

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

copy copy<br />

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

unpcklpd.eps

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