i386/i386.reference/ADC.htm

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   4 <TITLE>80386 Programmer's Reference Manual -- Opcode ADC</TITLE>
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   7 <B>up:</B> <A HREF="c17.htm">
   8 Chapter 17 -- 80386 Instruction Set</A><BR>
   9 <B>prev:</B><A HREF="AAS.htm"> AAS ASCII Adjust AL after Subtraction</A><BR>
  10 <B>next:</B><A HREF="ADD.htm"> ADD Add</A>
  11 <P>
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  13 <P>
  14 <H1>ADC -- Add with Carry</H1>
  15
  16 <PRE>
  17 Opcode    Instruction      Clocks    Description
  18
  19 14 ib     ADC AL,imm8      2         Add with carry immediate byte to AL
  20 15 iw     ADC AX,imm16     2         Add with carry immediate word to AX
  21 15 id     ADC EAX,imm32    2         Add with carry immediate dword to EAX
  22 80 /2 ib  ADC r/m8,imm8    2/7       Add with carry immediate byte to r/m
  23                                      byte
  24 81 /2 iw  ADC r/m16,imm16  2/7       Add with carry immediate word to r/m
  25                                      word
  26 81 /2 id  ADC r/m32,imm32  2/7       Add with CF immediate dword to r/m
  27                                      dword
  28 83 /2 ib  ADC r/m16,imm8   2/7       Add with CF sign-extended immediate
  29                                      byte to r/m word
  30 83 /2 ib  ADC r/m32,imm8   2/7       Add with CF sign-extended immediate
  31                                      byte into r/m dword
  32 10 /r     ADC r/m8,r8      2/7       Add with carry byte register to r/m
  33                                      byte
  34 11 /r     ADC r/m16,r16    2/7       Add with carry word register to r/m
  35                                      word
  36 11 /r     ADC r/m32,r32    2/7       Add with CF dword register to r/m dword
  37 12 /r     ADC r8,r/m8      2/6       Add with carry r/m byte to byte
  38                                      register
  39 13 /r     ADC r16,r/m16    2/6       Add with carry r/m word to word
  40                                      register
  41 13 /r     ADC r32,r/m32    2/6       Add with CF r/m dword to dword register
  42 </PRE>
  43
  44 <H2>Operation</H2>
  45
  46 <PRE>
  47 DEST := DEST + SRC + CF;
  48 </PRE>
  49
  50 <H2>Description</H2>
  51
  52 ADC performs an integer addition of the two operands DEST and SRC and the
  53 carry flag, CF. The result of the addition is assigned to the first operand
  54 (DEST), and the flags are set accordingly. ADC is usually executed as part
  55 of a multi-byte or multi-word addition operation. When an immediate byte
  56 value is added to a word or doubleword operand, the immediate value is first
  57 sign-extended to the size of the word or doubleword operand.
  58
  59 <H2>Flags Affected</H2>
  60
  61 OF, SF, ZF, AF, CF, and PF as described in <A HREF="appc.htm">Appendix C</A>
  62
  63 <H2>Protected Mode Exceptions</H2>
  64
  65 #GP(0) if the result is in a nonwritable segment; #GP(0) for an illegal
  66 memory operand effective address in the CS, DS, ES, FS, or GS segments;
  67 #SS(0) for an illegal address in the SS segment; #PF(fault-code) if page
  68 fault
  69
  70 <H2>Real Address Mode Exceptions</H2>
  71
  72 Interrupt 13 if any part of the operand would lie outside of the effective
  73 address space from 0 to 0FFFFH
  74
  75 <H2>Virtual 8086 Mode Exceptions</H2>
  76
  77 Same exceptions as in Real Address Mode; #PF(fault-code) for a page fault
  78
  79
  80 <P>
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  82 <P>
  83 <B>up:</B> <A HREF="c17.htm">
  84 Chapter 17 -- 80386 Instruction Set</A><BR>
  85 <B>prev:</B><A HREF="AAS.htm"> AAS ASCII Adjust AL after Subtraction</A><BR>
  86 <B>next:</B><A HREF="ADD.htm"> ADD Add</A>
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