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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 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, 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. 230 PANDN
26568—Rev. 3.02—August 2002 AMD 64-Bit Technology PAVGB Packed Average Unsigned Bytes Computes the rounded average of each packed unsigned 8-bit integer value in the first source operand and the corresponding packed 8-bit unsigned integer in the second source operand and writes each average in the corresponding byte of the destination (first source). The average is computed by adding each pair of operands, adding 1 to the 9-bit temporary sum, and then right-shifting the temporary sum by one bit position. The destination and source operands are an XMM register and another XMM register or 128-bit memory location. Mnemonic Opcode Description PAVGB xmm1, xmm2/mem128 66 0F E0 /r Averages packed 8-bit unsigned integer values in an XMM register and another XMM register or 128-bit memory location and writes the result in the destination XMM register. xmm1 xmm2/mem128 . . . . . . . . . . . . . . 127 0 127 0 . . . . . . . . . . . . . . average average . . . . . . . . . . . . . . pavgb-128.eps Related Instructions PAVGW rFLAGS Affected None MXCSR Flags Affected None PAVGB 231
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