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AMD 64-Bit Technology 26568—Rev. 3.02—August 2002 Exceptions Exception Invalid opcode, #UD Real X Virtual 8086 Protected Cause of Exception X X The SSE instructions are not supported, as indicated by bit 25 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 was cleared to 0. Device not available, X X X The task-switch bit (TS) of CR0 was set to 1. #NM 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. 204 ORPS
26568—Rev. 3.02—August 2002 AMD 64-Bit Technology PACKSSDW Pack with Saturation Signed Doubleword to Word Converts each 32-bit signed integer in the first and second source operands to a 16-bit signed integer and packs the converted values into words 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 words of the destination, and the converted values from the second source operand are packed into the high-order words of the destination. Mnemonic Opcode Description PACKSSDW xmm1, xmm2/mem128 66 0F 6B /r Packs 32-bit signed integers in an XMM register and another XMM register or 128-bit memory location into 16-bit signed integers in an XMM register. xmm1 xmm2/mem128 127 96 95 64 63 32 31 0 127 96 95 64 63 32 31 0 convert . . . . convert convert convert . . . . 127 112 111 96 95 80 79 64 63 48 47 32 31 16 15 0 packssdw-128.eps For each packed value in the destination, if the value is larger than the largest signed 16-bit integer, it is saturated to 7FFFh, and if the value is smaller than the smallest signed 16-bit integer, it is saturated to 8000h. Related Instructions PACKSSWB, PACKUSWB PACKSSDW 205
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