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AMD64 Technology 24594 Rev. 3.10 February 2005SUBSubtractSubtracts an immediate value or the value in a register or memory location (secondoperand) from a register or a memory location (first operand) and stores the result inthe first operand location. An immediate value is sign-extended to the length of thefirst operand.This instruction evaluates the result for both signed and unsigned data types and setsthe OF and CF flags to indicate a borrow in a signed or unsigned result, respectively. Itsets the SF flag to indicate the sign of a signed result.The forms of the SUB instruction that write to memory support the LOCK prefix. Fordetails about the LOCK prefix, see “Lock Prefix” on page 10.Mnemonic Opcode DescriptionSUB AL, imm8SUB AX, imm16SUB EAX, imm32SUB RAX, imm32SUB reg/mem8, imm8SUB reg/mem16, imm16SUB reg/mem32, imm32SUB reg/mem64, imm32SUB reg/mem16, imm8SUB reg/mem32, imm8SUB reg/mem64, imm82C ib2D iw2D id2D id80 /5 ib81 /5 iw81 /5 id81 /5 id83 /5 ib83 /5 ib83 /5 ibSubtract an immediate 8-bit value from the AL register and storethe result in AL.Subtract an immediate 16-bit value from the AX register and storethe result in AX.Subtract an immediate 32-bit value from the EAX register andstore the result in EAX.Subtract a sign-extended immediate 32-bit value from the RAXregister and store the result in RAX.Subtract an immediate 8-bit value from an 8-bit destinationregister or memory location.Subtract an immediate 16-bit value from a 16-bit destinationregister or memory location.Subtract an immediate 32-bit value from a 32-bit destinationregister or memory location.Subtract a sign-extended immediate 32-bit value from a 64-bitdestination register or memory location.Subtract a sign-extended immediate 8-bit value from a 16-bitregister or memory location.Subtract a sign-extended immediate 8-bit value from a 32-bitregister or memory location.Subtract a sign-extended immediate 8-bit value from a 64-bitregister or memory location.282 SUB
24594 Rev. 3.10 February 2005 AMD64 TechnologyMnemonic Opcode DescriptionSUB reg/mem8, reg8 28 /rSUB reg/mem16, reg16 29 /rSUB reg/mem32, reg32 29 /rSUB reg/mem64, reg64 29 /rSUB reg8, reg/mem8 2A /rSUB reg16, reg/mem16 2B /rSUB reg32, reg/mem32 2B /rSUB reg64, reg/mem64 2B /rSubtract the contents of an 8-bit register from an 8-bit destinationregister or memory location.Subtract the contents of a 16-bit register from a 16-bit destinationregister or memory location.Subtract the contents of a 32-bit register from a 32-bit destinationregister or memory location.Subtract the contents of a 64-bit register from a 64-bit destinationregister or memory location.Subtract the contents of an 8-bit register or memory operandfrom an 8-bit destination register.Subtract the contents of a 16-bit register or memory operandfrom a 16-bit destination register.Subtract the contents of a 32-bit register or memory operandfrom a 32-bit destination register.Subtract the contents of a 64-bit register or memory operandfrom a 64-bit destination register.Related InstructionsADC, ADD, SBBSUB 283
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