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AMD 64-Bit Technology 26568—Rev. 3.02—August 2002 PUNPCKLWD Unpack and Interleave Low Words Unpacks the low-order words from the first and second source operands and packs them into interleaved-word doublewords in the destination (first source). The highorder words of the source operands are ignored. The first source/destination operand is an XMM register and the second source operand is another XMM register or 128-bit memory location. Mnemonic Opcode Description PUNPCKLWD xmm1, xmm2/mem128 66 0F 61 /r Unpacks the four low-order words in an XMM register and another XMM register or 128-bit memory location and packs them into interleaved words in the destination XMM register. xmm1 xmm2/mem128 127 64 63 48 47 32 31 16 15 0 127 64 63 48 47 32 31 16 15 0 copy . . copy copy . . copy . . . . . . . . . . . . . . . . 127 112 111 96 95 80 79 64 63 48 47 32 31 16 15 0 punpcklwd-128.eps If the second source operand is all 0s, the destination contains the words from the first source operand zero-extended to 32 bits. This operation is useful for expanding unsigned 16-bit values to unsigned 32-bit operands for subsequent processing that requires higher precision. Related Instructions PUNPCKHBW, PUNPCKHDQ, PUNPCKHQDQ, PUNPCKHWD, PUNPCKLBW, PUNPCKLDQ, PUNPCKLQDQ 338 PUNPCKLWD
26568—Rev. 3.02—August 2002 AMD 64-Bit Technology rFLAGS Affected None MXCSR Flags Affected None Exceptions Exception Invalid opcode, #UD Real X Virtual 8086 Protected Cause of Exception X X The SSE2 instructions are not supported, as indicated by bit 26 of CPUID standard function 1. X X X The emulate bit (EM) of CR0 was set to 1. X X X The operating-system FXSAVE/FXRSTOR support bit (OSFXSR) of CR4 is cleared to 0. Device not available, #NM X X X The task-switch bit (TS) of CR0 was set to 1. Stack, #SS X X X A memory address exceeded the stack segment limit or was non-canonical. General protection, #GP X X X A memory address exceeded a data segment limit or was non-canonical. X A null data segment was used to reference memory. X X X The memory operand was not aligned on a 16-byte boundary. Page fault, #PF X X A page fault resulted from the execution of the instruction. PUNPCKLWD 339
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