Intel 64 and IA-32 Architectures Software Developers Manual Volume 1, Basic Architecture

Vol. 1 5-15
INSTRUCTION SET SUMMARY
PUNPCKHWD Unpack high-order words
PUNPCKHDQ Unpack high-order doublewords
PUNPCKLBW Unpack low-order bytes
PUNPCKLWD Unpack low-order words
PUNPCKLDQ Unpack low-order doublewords
5.4.3 MMX Packed Arithmetic Instructions
The packed arithmetic instructions perform packed integer arithmetic on packed
byte, word, and doubleword integers.
PADDB Add packed byte integers
PADDW Add packed word integers
PADDD Add packed doubleword integers
PADDSB Add packed signed byte integers with signed saturation
PADDSW Add packed signed word integers with signed saturation
PADDUSB Add packed unsigned byte integers with unsigned saturation
PADDUSW Add packed unsigned word integers with unsigned saturation
PSUBB Subtract packed byte integers
PSUBW Subtract packed word integers
PSUBD Subtract packed doubleword integers
PSUBSB Subtract packed signed byte integers with signed saturation
PSUBSW Subtract packed signed word integers with signed saturation
PSUBUSB Subtract packed unsigned byte integers with unsigned saturation
PSUBUSW Subtract packed unsigned word integers with unsigned
saturation
PMULHW Multiply packed signed word integers and store high result
PMULLW Multiply packed signed word integers and store low result
PMADDWD Multiply and add packed word integers
5.4.4 MMX Comparison Instructions
The compare instructions compare packed bytes, words, or doublewords.
PCMPEQB Compare packed bytes for equal
PCMPEQW Compare packed words for equal
PCMPEQD Compare packed doublewords for equal
PCMPGTB Compare packed signed byte integers for greater than
PCMPGTW Compare packed signed word integers for greater than
PCMPGTD Compare packed signed doubleword integers for greater than