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AMD 64-Bit Technology 26568—Rev. 3.02—August 2002 MOVD Move Doubleword or Quadword Moves a 32-bit or 64-bit value in one of the following ways: „ from a 32-bit or 64-bit general-purpose register or memory location to the loworder 32 or 64 bits of an XMM register, with zero-extension to 128 bits „ from the low-order 32 or 64 bits of an XMM to a 32-bit or 64-bit general-purpose register or memory location „ from a 32-bit or 64-bit general-purpose register or memory location to the loworder 32 bits (with zero-extension to 64 bits) or the full 64 bits of an MMX register „ from the low-order 32 or the full 64 bits of an MMX register to a 32-bit or 64-bit general-purpose register or memory location Mnemonic Opcode Description MOVD xmm, reg/mem32 66 0F 6E /r Move 32-bit value from a general-purpose register or 32-bit memory location to an XMM register. MOVD xmm, reg/mem64 66 0F 6E /r Move 64-bit value from a general-purpose register or 64-bit memory location to an XMM register. MOVD reg/mem32, xmm 66 0F 7E /r Move 32-bit value from an XMM register to a 32-bit generalpurpose register or memory location. MOVD reg/mem64, xmm 66 0F 7E /r Move 64-bit value from an XMM register to a 64-bit generalpurpose register or memory location. MOVD mmx, reg/mem32 0F 6E /r Move 32-bit value from a general-purpose register or 32-bit memory location to an MMX register. MOVD mmx, reg/mem64 0F 6E /r Move 64-bit value from a general-purpose register or 64-bit memory location to an MMX register. MOVD reg/mem32, mmx 0F 7E /r Move 32-bit value from an MMX register to a 32-bit generalpurpose register or memory location. MOVD reg/mem64, mmx 0F 7E /r Move 64-bit value from an MMX register to a 64-bit generalpurpose register or memory location. The following diagrams illustrate the operation of the MOVD instruction. 144 MOVD
26568—Rev. 3.02—August 2002 AMD 64-Bit Technology xmm 127 32 31 0 0 reg/mem32 31 0 xmm 127 64 63 0 0 reg/mem64 63 0 All operations are "copy" reg/mem32 31 0 with REX prefix xmm 127 32 31 0 reg/mem64 63 0 xmm 127 64 63 0 mmx 63 32 31 0 0 with REX prefix reg/mem32 31 0 mmx 63 0 reg/mem64 63 0 reg/mem32 31 0 with REX prefix mmx 63 32 31 0 reg/mem64 63 0 mmx 63 0 with REX prefix movd.eps MOVD 145
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