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AMD 64-Bit Technology 26568—Rev. 3.02—August 2002 PSUBSB Packed Subtract Signed With Saturation Bytes Subtracts each packed 8-bit signed integer value in the second source operand from the corresponding packed 8-bit signed integer in the first source operand and writes the signed integer result of each subtraction in the corresponding byte 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 PSUBSB xmm1, xmm2/mem128 66 0F E8 /r Subtracts packed byte signed integer values in an XMM register or 128-bit memory location from packed byte integer values in another XMM register and writes the result in the destination XMM register. xmm1 xmm2/mem128 . . . . . . . . . . . . . . 127 0 127 0 . . . . . . . . . . . . . . subtract saturate subtract saturate . . . . . . . . . . . . . . psubsb-128.eps For each packed value in the destination, if the value is larger than the largest signed 8-bit integer, it is saturated to 7Fh, and if the value is smaller than the smallest signed 8-bit integer, it is saturated to 80h. Related Instructions PSUBB, PSUBD, PSUBQ, PSUBSW, PSUBUSB, PSUBUSW, PSUBW rFLAGS Affected None 314 PSUBSB
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. PSUBSB 315
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