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660 AMD Geode™ LX Processors Data Book
Instruction Set
33234H
Table 8-28. MMX™ Instruction Set
MMX™ Instructions Opcode Operation Clock Ct Notes
EMMS Empty MMX State 0F77 Tag Word <--- FFFFh (empties the floating point tag word) 1 1
MASKMOVQ Streaming (Cache Bypass) Store Using Byte Mask (Using EDI Register) 2
MMX Register1with MMX Register2 0FF7 [11 mm1
mm2]
memory [edi] [byte] <--- MMX reg 2 [Sign byte] ? MMX reg 1
[byte] : memory [edi] [byte]
MOVD Move Doubleword
Register to MMX Register 0F6E [11 mm reg] MMX reg [qword] <--- zero extend --- reg [dword] 1
MMX Register to Register 0F7E [11 mm reg] reg [qword] <--- MMX reg [low dword] 1
Memory to MMX Register 0F6E [mod mm r/m] MMX regr [qword] <--- zero extend --- memory [dword] 1
MMX Register to Memory 0F7E [mod mm r/m] Memory [dword] <--- MMX reg [low dword] 1
MOVNTQ Streaming (Cache Bypass) Store 1
MMX Register to Memory64 0FE7 [mod mm r/m] Memory64 [qword] <--- MMX reg [qword]
MOVQ Move Quardword
MMX Register 2 to MMX Register 1 0F6F [11 mm1
mm2]
MMX reg 1 [qword] <--- MMX reg 2 [qword] 1
MMX Register 1 to MMX Register 2 0F7F [11 mm1
mm2]
MMX reg 2 [qword] <--- MMX reg 1 [qword] 1
Memory to MMX Register 0F6F [mod mm r/m] MMX reg [qword] <--- memory[qword] 1
MMX Register to Memory 0F7F [mod mm r/m] Memory [qword] <--- MMX reg [qword] 1
PACKSSDW Pack Dword with Signed Saturation
MMX Register 2 to MMX Register 1 0F6B [11 mm1
mm2]
MMX reg 1 [qword] <--- packdw, signed sat --- MMX reg 2,
MMX reg 1
2
Memory to MMX Register 0F6B [mod mm r/m] MMX reg [qword] <--- packdw, signed sat --- memory, MMX
reg
2
PACKSSWB Pack Word with Signed Saturation
MMX Register 2 to MMX Register 1 0F63 [11 mm1 mm2] MMX reg 1 [qword] <--- packwb, signed sat --- MMX reg 2,
MMX reg 1
2
Memory to MMX Register 0F63 [mod mm r/m] MMX reg [qword] <--- packwb, signed sat --- memory, MMX
reg
2
PACKUSWB Pack Word with Unsigned Saturation
MMX Register 2 to MMX Register 1 0F67 [11 mm1 mm2] MMX reg 1 [qword] <--- packwb, unsigned sat --- MMX reg 2,
MMX reg 1
2
Memory to MMX Register 0F67 [mod mm r/m] MMX reg [qword] <--- packwb, unsigned sat --- memory, MMX
reg
2
PADDB Packed Add Byte with Wrap-Around
MMX Register 2 to MMX Register 1 0FFC [11 mm1
mm2]
MMX reg 1 [byte] <--- MMX reg 1 [byte] + MMX reg 2 [byte] 2
Memory to MMX Register 0FFC [mod mm r/m] MMX reg[byte] <--- memory [byte] + MMX reg [byte] 2
PADDD Packed Add Dword with Wrap-Around
MMX Register 2 to MMX Register 1 0FFE [11 mm1
mm2]
MMX reg 1 [sign dword] <--- MMX reg 1 [sign dword] + MMX
reg 2 [sign dword]
2
Memory to MMX Register 0FFE [mod mm r/m] MMX reg [sign dword] <--- memory [sign dword] + MMX reg
[sign dword]
2
PADDSB Packed Add Signed Byte with Saturation
MMX Register 2 to MMX Register 1 0FEC [11 mm1
mm2]
MMX reg 1 [sign byte] <--- sat --- (MMX reg 1 [sign byte] +
MMX reg 2 [sign byte])
2
Memory to Register 0FEC [mod mm r/m] MMX reg [sign byte] <--- sat --- (memory [sign byte] + MMX
reg [sign byte])
2
PADDSW Packed Add Signed Word with Saturation
MMX Register 2 to MMX Register 1 0FED [11 mm1
mm2]
MMX reg 1 [sign word] <--- sat --- (MMX reg 1 [sign word] +
MMX reg 2 [sign word])
2
Memory to Register 0FED [mod mm r/m] MMX reg [sign word] <--- sat --- (memory [sign word] + MMX
reg [sign word])
2
PADDUSB Add Unsigned Byte with Saturation
MMX Register 2 to MMX Register 1 0FDC [11 mm1
mm2]
MMX reg 1 [byte] <--- sat --- (MMX reg 1 [byte] + MMX reg 2
[byte])
2
Memory to Register 0FDC [mod mm r/m] MMX reg [byte] <--- sat --- (memory [byte] + MMX reg [byte]) 2