Intel 64 and IA-32 Architectures Software Developers Manual Volume 2B, Instruction Set Reference, N-Z

B-58 Vol. 2B
INSTRUCTION FORMATS AND ENCODINGS
PSUBUS – Subtract unsigned with
saturation
mmxreg2 from mmxreg1 0000 1111:1101 10gg: 11 mmxreg1 mmxreg2
memory from mmxreg 0000 1111:1101 10gg: mod mmxreg r/m
PUNPCKH – Unpack high data to next larger
type
mmxreg2 to mmxreg1 0000 1111:0110 10gg: 11 mmxreg1 mmxreg2
memory to mmxreg 0000 1111:0110 10gg: mod mmxreg r/m
PUNPCKL – Unpack low data to next larger
type
mmxreg2 to mmxreg1 0000 1111:0110 00gg: 11 mmxreg1 mmxreg2
memory to mmxreg 0000 1111:0110 00gg: mod mmxreg r/m
PXOR – Bitwise Xor
mmxreg2 to mmxreg1 0000 1111:1110 1111: 11 mmxreg1 mmxreg2
memory to mmxreg 0000 1111:1110 1111: mod mmxreg r/m
NOTES:
1. The pack instructions perform saturation from signed packed data of one type to signed or
unsigned data of the next smaller type.
2. The format of the shift instructions has one additional format to support shifting by immediate
shift-counts. The shift operations are not supported equally for all data types.
Table B-19. MMX Instruction Formats and Encodings (Contd.)
Instruction and Format Encoding