Opcode Instruction Clocks Description 04 ib ADD AL,imm8 2 Add immediate byte to AL 05 iw ADD AX,imm16 2 Add immediate word to AX 05 id ADD EAX,imm32 2 Add immediate dword to EAX 80 /0 ib ADD r/m8,imm8 2/7 Add immediate byte to r/m byte 81 /0 iw ADD r/m16,imm16 2/7 Add immediate word to r/m word 81 /0 id ADD r/m32,imm32 2/7 Add immediate dword to r/m dword 83 /0 ib ADD r/m16,imm8 2/7 Add sign-extended immediate byte to r/m word 83 /0 ib ADD r/m32,imm8 2/7 Add sign-extended immediate byte to r/m dword 00 /r ADD r/m8,r8 2/7 Add byte register to r/m byte 01 /r ADD r/m16,r16 2/7 Add word register to r/m word 01 /r ADD r/m32,r32 2/7 Add dword register to r/m dword 02 /r ADD r8,r/m8 2/6 Add r/m byte to byte register 03 /r ADD r16,r/m16 2/6 Add r/m word to word register 03 /r ADD r32,r/m32 2/6 Add r/m dword to dword register
DEST := DEST + SRC;
When an immediate byte is added to a word or doubleword operand, the immediate value is sign-extended to the size of the word or doubleword operand.
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Chapter 17 -- 80386 Instruction Set
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