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AMD 64-Bit Technology 26568—Rev. 3.02—August 2002 PSUBUSW Packed Subtract Unsigned and Saturate Words Subtracts each packed 16-bit unsigned integer value in the second source operand from the corresponding packed 16-bit unsigned integer in the first source operand and writes the unsigned integer result of each subtraction in the corresponding word of 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. Mnemonic Opcode Description PSUBUSW xmm1, xmm2/mem128 66 0F D9 /r Subtracts packed 16-bit unsigned integer values in an XMM register or 128-bit memory location from packed 16-bit integer values in another XMM register and writes the result in the destination XMM register. xmm1 . . . . . . 127 112 111 96 95 80 79 64 63 48 47 32 31 16 15 0 xmm2/mem128 127 112 111 96 95 80 79 64 63 48 47 32 31 16 15 0 . . . . . . . . . . . . subtract saturate subtract saturate psubusw-128.eps For each packed value in the destination, if the value is larger than the largest unsigned 16-bit integer, it is saturated to FFFFh, and if the value is smaller than the smallest unsigned 16-bit integer, it is saturated to 0000h. Related Instructions PSUBB, PSUBD, PSUBQ, PSUBSB, PSUBSW, PSUBUSB, PSUBW rFLAGS Affected None MXCSR Flags Affected 320 PSUBUSW
26568—Rev. 3.02—August 2002 AMD 64-Bit Technology 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. PSUBUSW 321
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