Geode GXLV Processor Series Low Power Integrated x86 Solutions

Instruction Set (Continued)Table 7-33.Extended MMX Instruction Set SummaryMMX Instructions Opcode Operation and Clock CountPADDSIW Packed Add Signed Word with Saturation Using Implied DestinationMMX Register plus MMX Register to Implied Register 0F51 [11 mm1 mm2] Sum signed packed word from MMX register/memory ---> 1Memory plus MMX Register to Implied Register 0F51 [mod mm r/m] signed packed word in MMX register, saturate, and write result---> implied register1PAVEB Packed Average ByteMMX Register 2 with MMX Register 1 0F50 [11 mm1 mm2] Average packed byte from the MMX register/memory with 1Memory with MMX Register 0F50 [mod mm r/m] packed byte in the MMX register. Result is placed in the MMXregister.1PDISTIB Packed Distance and Accumulate with Implied RegisterMemory, MMX Register to Implied Register 0F54 [mod mm r/m] Find absolute value of difference between packed byte inmemoryandpackedbyteintheMMXregister.Usingunsignedsaturation, accumulate with value in implied destination register.2PMACHRIW Packed Multiply and Accumulate with RoundingMemory to MMX Register 0F5E[mod mm r/m] Multiply the packed word in the MMX register by the packedword in memory. Sum the 32-bit results pairwise. Accumulatethe result with the packed signed word in the implied destinationregister.PMAGW Packed MagnitudeMMX Register 2 to MMX Register 1 0F52 [11 mm1 mm2] Set the destination equal ---> the packed word with the largest 2Memory to MMX Register 0F52 [mod mm r/m] magnitude, between the packed word in the MMX register/memoryand the MMX register.2PMULHRIW Packed Multiply High with Rounding, Implied DestinationMMX Register 2 to MMX Register1 0F5D [11 mm1 mm2] Packed multiply high with rounding and store bits 30 - 15 in 2Memory to MMX Register 0F5D [mod mm r/m] implied register.2PMULHRW Packed Multiply High with RoundingMMX Register 2 to MMX Register 1 0F59 [11 mm1 mm2] Multiply the signed packed word in the MMX register/memory 2Memory to MMX Register 0F59 [mod mm r/m] with the signed packed word in the MMX register. Round with1/2 bit 15, and store bits 30 - 15 of result in the MMX register.2PMVGEZB Packed Conditional Move If Greater Than or Equal to ZeroMemory to MMX Register 0F5C [mod mm r/m] Conditionally move packed byte from memory ---> packed bytein the MMX register if packed byte in implied MMX register isgreater than or equal ---> zero.1PMVLZB Packed Conditional Move If Less Than ZeroMemory to MMX Register 0F5B [mod mm r/m] Conditionally move packed byte from memory ---> packed bytein the MMX register if packed byte in implied MMX register isless than zero.PMVNZB Packed Conditional Move If Not ZeroMemory to MMX Register 0F5A [mod mm r/m] Conditionally move packed byte from memory ---> packed bytein the MMX register if packed byte in implied MMX register isnot zero.PMVZB Packed Conditional Move If ZeroMemory to MMX Register 0F58 [mod mm r/m] Conditionally move packed byte from memory ---> packed bytein the MMX register if packed byte in implied the MMX registeris zero.PSUBSIW Packed Subtracted with Saturation Using Implied DestinationMMX Register 2 to MMX Register 1 0F55 [11 mm1 mm2] Subtract signed packed word in the MMX register/memory 1Memory to MMX Register 0F55 [mod mm r/m] from signed packed word in the MMX register, saturate, andwrite result ---> implied register.12111Geode GXLV Processor SeriesRevision 1.3 239 www.national.com