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

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AMD64 Technology 26568—Rev. 3.05—September 2003 PACKUSWB Pack with Saturation Signed Word to Unsigned Byte Converts each 16-bit signed integer in the first and second source operands to an 8-bit unsigned integer and packs the converted values into bytes in the destination (first source). The first source/destination operand is an XMM register and the second source operand is another XMM register or 128-bit memory location. Converted values from the first source operand are packed into the low-order bytes of the destination, and the converted values from the second source operand are packed into the high-order bytes of the destination. Mnemonic Opcode Description PACKUSWB xmm1, xmm2/mem128 66 0F 67 /r Packs 16-bit signed integers in an XMM register and another XMM register or 128-bit memory location into 8-bit unsigned integers in an XMM register. . convert For each packed value in the destination, if the value is larger than the largest unsigned 8-bit integer, it is saturated to FFh, and if the value is smaller than the smallest unsigned 8-bit integer, it is saturated to 00h. Related Instructions PACKSSDW, PACKSSWB . . xmm1 xmm2/mem128 127 112 111 96 95 80 79 64 63 48 47 32 31 16 15 0 210 PACKUSWB . . . . . . . . . . . . . . . 127 112 111 96 95 80 79 64 63 48 47 32 31 16 15 0 . . . . . . convert 127 64 63 0 packuswb-128.eps
26568—Rev. 3.05—September 2003 AMD64 Technology rFLAGS Affected None MXCSR Flags Affected None Exceptions Exception Real Invalid opcode, #UD X X Virtual 8086 Protected Cause of Exception X X X X The SSE2 instructions are not supported, as indicated by bit 26 of CPUID standard function 1. 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 X A memory address exceeded a data segment limit or was non-canonical. 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. PACKUSWB 211
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