GXM datasheet(235/244 Pages) NSC

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Instruction Set (Continued)

Table 9-33. Extended MMX Instruction Set Summary

MMX Instructions

Opcode

Operation and Clock Count

PADDSIW Packed Add Signed Word with Saturation Using Implied Destination

MMX Register plus MMX Register to Implied Register

0F51 [11 mm1 mm2]

Sum signed packed word from MMX register/memory --->

signed packed word in MMX register, saturate, and write result

---> implied register

Memory plus MMX Register to Implied Register

0F51 [mod mm r/m]

PAVEB Packed Average Byte

MMX Register 2 with MMX Register 1

0F50 [11 mm1 mm2]

Average packed byte from the MMX register/memory with

packed byte in the MMX register. Result is placed in the MMX

Memory with MMX Register

0F50 [mod mm r/m]

PDISTIB Packed Distance and Accumulate with Implied Register

Memory, MMX Register to Implied Register

0F54 [mod mm r/m]

Find absolute value of difference between packed byte in

memory and packed byte in the MMX register. Using unsigned

saturation, accumulate with value in implied destination regis-

ter.

PMACHRIW Packed Multiply and Accumulate with Rounding

Memory to MMX Register

0F5E[mod mm r/m]

Multiply the packed word in the MMX register by the packed

word in memory. Sum the 32-bit results pairwise. Accumulate

the result with the packed signed word in the implied destina-

tion register.

PMAGW Packed Magnitude

MMX Register 2 to MMX Register 1

0F52 [11 mm1 mm2]

Set the destination equal ---> the packed word with the largest

magnitude, between the packed word in the MMX regis-

ter/memory and the MMX register.

Memory to MMX Register

0F52 [mod mm r/m]

PMULHRIW Packed Multiply High with Rounding, Implied Destination

MMX Register 2 to MMX Register1

0F5D [11 mm1 mm2]

Packed multiply high with rounding and store bits 30 - 15 in

implied register.

Memory to MMX Register

0F5D [mod mm r/m]

PMULHRW Packed Multiply High with Rounding

MMX Register 2 to MMX Register 1

0F59 [11 mm1 mm2]

Multiply the signed packed word in the MMX register/memory

with the signed packed word in the MMX register. Round with

1/2 bit 15, and store bits 30 - 15 of result in the MMX register.

Memory to MMX Register

0F59 [mod mm r/m]

PMVGEZB Packed Conditional Move If Greater Than or Equal to Zero

Memory to MMX Register

0F5C [mod mm r/m]

Conditionally move packed byte from memory ---> packed byte

in the MMX register if packed byte in implied MMX register is

greater than or equal ---> zero.

PMVLZB Packed Conditional Move If Less Than Zero

Memory to MMX Register

0F5B [mod mm r/m]

Conditionally move packed byte from memory ---> packed byte

in the MMX register if packed byte in implied MMX register is

less than zero.

PMVNZB Packed Conditional Move If Not Zero

Memory to MMX Register

0F5A [mod mm r/m]

Conditionally move packed byte from memory ---> packed byte

in the MMX register if packed byte in implied MMX register is

not zero.

PMVZB Packed Conditional Move If Zero

Memory to MMX Register

0F58 [mod mm r/m]

Conditionally move packed byte from memory ---> packed byte

in the MMX register if packed byte in implied the MMX register

is zero.

PSUBSIW Packed Subtracted with Saturation Using Implied Destination

MMX Register 2 to MMX Register 1

0F55 [11 mm1 mm2]

Subtract signed packed word in the MMX register/memory from

signed packed word in the MMX register, saturate, and write

result ---> implied register.

Memory to MMX Register

0F55 [mod mm r/m]

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