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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 />

UNPCKLPD<br />

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 128-bit memory location.<br />

Mnemonic Opcode Description<br />

UNPCKLPD xmm1, xmm2/mem128 66 0F 14 /r Unpacks low-order double-precision floating-point values<br />

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

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

register.<br />

xmm1<br />

xmm2/mem128<br />

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

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

copy<br />

copy<br />

127<br />

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

unpcklpd.eps<br />

Related Instructions<br />

UNPCKHPD, UNPCKHPS, UNPCKLPS<br />

rFLAGS Affected<br />

None<br />

MXCSR Flags Affected<br />

UNPCKLPD 391

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