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

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AMD64 Technology 26568—Rev. 3.05—September 2003 Exceptions Exception Real Invalid opcode, #UD X X 314 PSUBQ 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.
26568—Rev. 3.05—September 2003 AMD64 Technology 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. 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 127 0 127 0 subtract saturate xmm1 xmm2/mem128 . . . . . . . . . . . . . . . . . . . . . . . . . . . . subtract saturate . . . . . . . . . . . . . . psubsb-128.eps PSUBSB 315
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