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

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 />

PADDQ Packed Add Quadwords<br />

Adds each packed <strong>64</strong>-bit integer value in the first source operand to the corresponding<br />

packed <strong>64</strong>-bit integer in the second source operand and writes the integer result of<br />

each addition in the corresponding quadword of the destination (first source). The<br />

first source/destination operand is an XMM register and the second source operand is<br />

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

Mnemonic Opcode Description<br />

PADDQ xmm1, xmm2/mem<strong>128</strong> 66 0F D4 /r Adds packed <strong>64</strong>-bit integer values in an XMM register and<br />

another XMM register or <strong>128</strong>-bit memory location and writes the<br />

result in the destination XMM register.<br />

This instruction operates on both signed and unsigned integers. If the result<br />

overflows, the carry is ignored (neither the overflow nor carry bit in rFLAGS is set),<br />

and only the low-order <strong>64</strong> bits of each result are written in the destination.<br />

Related Instructions<br />

PADDB, PADDD, PADDSB, PADDSW, PADDUSB, PADDUSW, PADDW<br />

rFLAGS Affected<br />

None<br />

MXCSR Flags Affected<br />

None<br />

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

127 <strong>64</strong><br />

63 0<br />

add<br />

216 PADDQ<br />

add<br />

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

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

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