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AMD Geode™ LX Processors Data Book 665
Instruction Set
33234H
PSUBB Subtract Byte With Wrap-Around
MMX Register 2 to MMX Register 1 0FF8 [11 mm1
mm2]
MMX reg 1 [byte] <--- MMX reg 1 [byte] - MMX reg 2 [byte] 2
Memory to MMX Register 0FF8 [mod mm r/m] MMX reg [byte] <--- MMX reg [byte] - memory [byte] 2
PSUBD Subtract Dword With Wrap-Around
MMX Register 2 to MMX Register 1 0FFA [11 mm1
mm2]
MMX reg 1 [dword] <--- MMX reg 1 [dword] - MMX reg 2
[dword]
2
Memory to MMX Register 0FFA [mod mm r/m] MMX reg [dword] <--- MMX reg [dword] - memory64 [dword] 2
PSUBSB Subtract Byte Signed With Saturation
MMX Register 2 to MMX Register 1 0FE8 [11 mm1
mm2]
MMX reg 1 [sign byte] <--- sat -- (MMX reg 1 [sign byte] sub-
tract MMX reg 2 [sign byte])
2
Memory to MMX Register 0FE8 [mod mm r/m] MMX reg [sign byte] <--- sat --- (MMX reg [sign byte] subtract
memory64 [sign byte])
2
PSUBSW Subtract Word Signed With Saturation
MMX Register 2 to MMX Register 1 0FE9 [11 mm1
mm2]
MMX reg 1 [sign word] <--- sat --- (MMX reg 1 [sign word] -
MMX reg 2 [sign word])
2
Memory to MMX Register 0FE9 [mod mm r/m] MMX reg [sign word] <--- sat --- (MMX reg [sign word] -
memory64 [sign word])
2
PSUBUSB Subtract Byte Unsigned With Saturation
MMX Register 2 to MMX Register 1 0FD8 [11 mm1
mm2]
MMX reg 1 [byte] <--- sat --- (MMX reg 1 [byte] - MMX reg 2
[byte])
2
Memory to MMX Register 0FD8 [11 mm reg] MMX reg [byte] <--- sat --- (MMX reg [byte] - memory64 [byte]) 2
PSUBUSW Subtract Word Unsigned With Saturation
MMX Register 2 to MMX Register 1 0FD9 [11 mm1
mm2]
MMX reg 1 [word] <--- sat --- (MMX reg 1 [word] - MMX reg 2
[word])
2
Memory to MMX Register 0FD9 [11 mm reg] MMX reg [word] <--- sat --- (MMX reg [word] - memory64
[word])
2
PSUBW Subtract Word With Wrap-Around
MMX Register 2 to MMX Register 1 0FF9 [11 mm1
mm2]
MMX reg 1 [word] <--- (MMX reg 1 [word] - MMX reg 2 [word]) 2
Memory to MMX Register 0FF9 [mod mm r/m] MMX reg [word] <--- (MMX reg [word] - memory64 [word]) 2
PUNPCKHBW Unpack High Packed Byte, Data to Packed Words
MMX Register 2 to MMX Register 1 0F68 [11 mm1 mm2] MMX reg 1 [word] <--- {MMX reg 1 [high byte], MMX reg 2
[high byte]}
2
Memory to MMX Register 0F68 [11 mm reg] MMX reg [word] <--- {memory64 [high byte], MMX reg [high
byte]}
2
PUNPCKHDQ Unpack High Packed Dword, Data to Qword
MMX Register 2 to MMX Register 1 0F6A [11 mm1
mm2]
MMX reg 1 <--- MMX reg 1 [high dword], MMX reg 2 [high
dword]
2
Memory to MMX Register 0F6A [11 mm reg] MMX reg <--- {memory64 [high dword], MMX reg [high
dword]}
2
PUNPCKHWD Unpack High Packed Word, Data to Packed Dwords
MMX Register 2 to MMX Register 1 0F69 [11 mm1 mm2] MMX reg 1 [dword] <--- MMX reg 1 [high word], MMX reg 2
[high word]
2
Memory to MMX Register 0F69 [11 mm reg] MMX reg [dword] <--- memory64 [high word], MMX reg [high
word]
2
PUNPCKLBW Unpack Low Packed Byte, Data to Packed Words
MMX Register 2 to MMX Register 1 0F60 [11 mm1 mm2] MMX reg 1 [word] <--- MMX reg 1 [low byte], MMX reg 2 [low
byte]
2
Memory to MMX Register 0F60 [11 mm reg] MMX reg [word] <--- memory64 [low byte], MMX reg [low byte] 2
PUNPCKLDQ Unpack Low Packed Dword, Data to Qword
MMX Register 2 to MMX Register 1 0F62 [11 mm1 mm2] MMX reg 1 <--- MMX reg 1 [low dword], MMX reg 2 [low
dword]
2
Memory to MMX Register 0F62 [11 mm reg] MMX reg <--- memory64 [low dword], MMX reg [low dword] 2
PUNPCKLWD Unpack Low Packed Word, Data to Packed Dwords
MMX Register 2 to MMX Register 1 0F61 [11 mm1 mm2] MMX reg 1 [dword] <--- MMX reg 1 [low word], MMX reg 2
[low word]
2
Memory to MMX Register 0F61 [11 mm reg] MMX reg [dword] <--- memory64 [low word], MMX reg [low
word]
2
Table 8-28. MMX™ Instruction Set (Continued)
MMX™ Instructions Opcode Operation Clock Ct Notes