MMX Instructions

The MMX instructions enable x86 processors to perform single-instruction, multiple-data(SIMD) operations on packed byte, word, doubleword, or quadword integer operands contained in memory, in MMX registers, or in general-purpose registers.

Data Transfer Instructions (MMX)

The data transfer instructions move doubleword and quadword operands between MMX registers and between MMX registers and memory.

Table 3-20 Data Transfer Instructions (MMX)

Oracle Solaris Mnemonic	Intel/AMD Mnemonic	Description	Notes
`movd`	`MOVD`	move doubleword	`movdq` valid only under `-m64`
`movq`	`MOVQ`	move quadword	valid only under `-m64`

Conversion Instructions (MMX)

The conversion instructions pack and unpack bytes, words, and doublewords.

Table 3-21 Conversion Instructions (MMX)

Oracle Solaris Mnemonic	Intel/AMD Mnemonic	Description
`packssdw`	`PACKSSDW`	pack doublewords into words with signed saturation
`packsswb`	`PACKSSWB`	pack words into bytes with signed saturation
`packuswb`	`PACKUSWB`	pack words into bytes with unsigned saturation
`punpckhbw`	`PUNPCKHBW`	unpack high-order bytes
`punpckhdq`	`PUNPCKHDQ`	unpack high-order doublewords
`punpckhwd`	`PUNPCKHWD`	unpack high-order words
`punpcklbw`	`PUNPCKLBW`	unpack low-order bytes
`punpckldq`	`PUNPCKLDQ`	unpack low-order doublewords
`punpcklwd`	`PUNPCKLWD`	unpack low-order words

Packed Arithmetic Instructions (MMX)

The packed arithmetic instructions perform packed integer arithmetic on packed byte, word, and doubleword integers.

Table 3-22 Packed Arithmetic Instructions (MMX)

Oracle Solaris Mnemonic	Intel/AMD Mnemonic	Description
`paddb`	`PADDB`	add packed byte integers
`paddd`	`PADDD`	add packed doubleword integers
`paddsb`	`PADDSB`	add packed signed byte integers with signed saturation
`paddsw`	`PADDSW`	add packed signed word integers with signed saturation
`paddusb`	`PADDUSB`	add packed unsigned byte integers with unsigned saturation
`paddusw`	`PADDUSW`	add packed unsigned word integers with unsigned saturation
`paddw`	`PADDW`	add packed word integers
`pmaddwd`	`PMADDWD`	multiply and add packed word integers
`pmulhw`	`PMULHW`	multiply packed signed word integers and store high result
`pmullw`	`PMULLW`	multiply packed signed word integers and store low result
`psubb`	`PSUBB`	subtract packed byte integers
`psubd`	`PSUBD`	subtract packed doubleword integers
`psubsb`	`PSUBSB`	subtract packed signed byte integers with signed saturation
`psubsw`	`PSUBSW`	subtract packed signed word integers with signed saturation
`psubusb`	`PSUBUSB`	subtract packed unsigned byte integers with unsigned saturation
`psubusw`	`PSUBUSW`	subtract packed unsigned word integers with unsigned saturation
`psubw`	`PSUBW`	subtract packed word integers

Comparison Instructions (MMX)

The compare instructions compare packed bytes, words, or doublewords.

Table 3-23 Comparison Instructions (MMX)

Oracle Solaris Mnemonic	Intel/AMD Mnemonic	Description
`pcmpeqb`	`PCMPEQB`	compare packed bytes for equal
`pcmpeqd`	`PCMPEQD`	compare packed doublewords for equal
`pcmpeqw`	`PCMPEQW`	compare packed words for equal
`pcmpgtb`	`PCMPGTB`	compare packed signed byte integers for greater than
`pcmpgtd`	`PCMPGTD`	compare packed signed doubleword integers for greater than
`pcmpgtw`	`PCMPGTW`	compare packed signed word integers for greater than

Logical Instructions (MMX)

The logical instructions perform logical operations on quadword operands.

Table 3-24 Logical Instructions (MMX)

Oracle Solaris Mnemonic	Intel/AMD Mnemonic	Description
`pand`	`PAND`	bitwise logical AND
`pandn`	`PANDN`	bitwise logical AND NOT
`por`	`POR`	bitwise logical OR
`pxor`	`PXOR`	bitwise logical XOR

Shift and Rotate Instructions (MMX)

The shift and rotate instructions operate on packed bytes, words, doublewords, or quadwords in 64–bit operands.

Table 3-25 Shift and Rotate Instructions (MMX)

Oracle Solaris Mnemonic	Intel/AMD Mnemonic	Description
`pslld`	`PSLLD`	shift packed doublewords left logical
`psllq`	`PSLLQ`	shift packed quadword left logical
`psllw`	`PSLLW`	shift packed words left logical
`psrad`	`PSRAD`	shift packed doublewords right arithmetic
`psraw`	`PSRAW`	shift packed words right arithmetic
`psrld`	`PSRLD`	shift packed doublewords right logical
`psrlq`	`PSRLQ`	shift packed quadword right logical
`psrlw`	`PSRLW`	shift packed words right logical

State Management Instructions (MMX)

The emms (EMMS) instruction clears the MMX state from the MMX registers.

Table 3-26 State Management Instructions (MMX)

Oracle Solaris Mnemonic	Intel/AMD Mnemonic	Description	Notes
`emms`	`EMMS`	empty MMX state

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