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AMD 64-Bit Technology 26568—Rev. 3.02—August 2002 PSUBW Packed Subtract Words Subtracts each packed 16-bit integer value in the second source operand from the corresponding packed 16-bit integer in the first source operand and writes the 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 PSUBW xmm1, xmm2/mem128 66 0F F9 /r Subtracts packed 16-bit 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 . . . . . . subtract . . . . . . psubw-128.eps This instruction operates on both signed and unsigned integers. If the result overflows, the carry is ignored (neither the overflow nor carry bit in rFLAGS is set), and only the low-order 16 bits of the result are written in the destination. Related Instructions PSUBB, PSUBD, PSUBQ, PSUBSB, PSUBSW, PSUBUSB, PSUBUSW rFLAGS Affected None 322 PSUBW
26568—Rev. 3.02—August 2002 AMD 64-Bit Technology 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. PSUBW 323
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