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原帖由 rtp 于 2007-8-14 10:06 发表 ![]()
请给出出处.谢谢.
B.4.3 ADD: Add Integers
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ADD r/m8,reg8 ; 00 /r [8086]
ADD r/m16,reg16 ; o16 01 /r [8086]
ADD r/m32,reg32 ; o32 01 /r [386]
ADD reg8,r/m8 ; 02 /r [8086]
ADD reg16,r/m16 ; o16 03 /r [8086]
ADD reg32,r/m32 ; o32 03 /r [386]
ADD r/m8,imm8 ; 80 /7 ib [8086]
ADD r/m16,imm16 ; o16 81 /7 iw [8086]
ADD r/m32,imm32 ; o32 81 /7 id [386]
ADD r/m16,imm8 ; o16 83 /7 ib [8086]
ADD r/m32,imm8 ; o32 83 /7 ib [386]
ADD AL,imm8 ; 04 ib [8086]
ADD AX,imm16 ; o16 05 iw [8086]
ADD EAX,imm32 ; o32 05 id [386]ADD performs integer addition: it adds its two operands together, and leaves the result in its destination (first) operand. The destination operand can be a register or a memory location. The source operand can be a register, a memory location or an immediate value.
The flags are set according to the result of the operation: in particular, the carry flag is affected and can be used by a subsequent ADC instruction.
In the forms with an 8-bit immediate second operand and a longer first operand, the second operand is considered to be signed, and is sign-extended to the length of the first operand. In these cases, the BYTE qualifier is necessary to force NASM to generate this form of the instruction.
B.4.120 INC: Increment Integer
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INC reg16 ; o16 40+r [8086]
INC reg32 ; o32 40+r [386]
INC r/m8 ; FE /0 [8086]
INC r/m16 ; o16 FF /0 [8086]
INC r/m32 ; o32 FF /0 [386]
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楼主: 0521
发表于 2007-08-14 09:58
发表于 2007-08-14 10:16