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

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AMD64 Technology 26568—Rev. 3.05—September 2003 PAVGW Packed Average Unsigned Words Computes the rounded average of each packed unsigned 16-bit integer value in the first source operand and the corresponding packed 16-bit unsigned integer in the second source operand and writes each average in the corresponding word of the destination (first source). The average is computed by adding each pair of operands, adding 1 to the 17-bit temporary sum, and then right-shifting the temporary sum by one bit position. 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 PAVGW xmm1, xmm2/mem128 66 0F E3 /r Averages packed 16-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. Related Instructions PAVGB rFLAGS Affected None MXCSR Flags Affected None average xmm1 xmm2/mem128 . . . . . . 127 112 111 96 95 80 79 64 63 48 47 32 31 16 15 0 . . . . . . average 234 PAVGW 127 112 111 96 95 80 79 64 63 48 47 32 31 16 15 0 . . . . . . pavgw-128.eps
26568—Rev. 3.05—September 2003 AMD64 Technology Exceptions Exception Real Invalid opcode, #UD X Virtual 8086 Protected Cause of Exception X X The SSE instructions are not supported, as indicated by bit 25 in 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. X X X 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. PAVGW 235
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