x86 Assembly Language Reference Manual

3.16 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.

3.16.1 Data Transfer Instructions (MMX)

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

Table 33  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

3.16.2 Conversion Instructions (MMX)

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

Table 34  Conversion Instructions (MMX)

Oracle Solaris Mnemonic Intel/AMD Mnemonic Description Notes 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

3.16.3 Packed Arithmetic Instructions (MMX)

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

Table 35  Packed Arithmetic Instructions (MMX)

Oracle Solaris Mnemonic Intel/AMD Mnemonic Description Notes 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

3.16.4 Comparison Instructions (MMX)

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

Table 36  Comparison Instructions (MMX)

Oracle Solaris Mnemonic Intel/AMD Mnemonic Description Notes 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

3.16.5 Logical Instructions (MMX)

The logical instructions perform logical operations on quadword operands.

Table 37  Logical Instructions (MMX)

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

3.16.6 Shift and Rotate Instructions (MMX)

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

Table 38  Shift and Rotate Instructions (MMX)

Oracle Solaris Mnemonic Intel/AMD Mnemonic Description Notes 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

3.16.7 State Management Instructions (MMX)

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

Table 39  State Management Instructions (MMX)

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