hw/i386.reference/SETcc.htm

   1 <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
   2 <HTML>
   3 <HEAD>
   4 <TITLE>80386 Programmer's Reference Manual -- Opcode SETcc</TITLE>
   5 </HEAD>
   6 <BODY>
   7 <B>up:</B> <A HREF="c17.htm">
   8 Chapter 17 -- 80386 Instruction Set</A><BR>
   9 <B>prev:</B><A HREF="SCAS.htm"> SCAS/SCASB/SCASW/SCASD Compare String Data</A><BR>
  10 <B>next:</B><A HREF="SGDT.htm"> SGDT/SIDT Store Global/Interrupt Descriptor Table Register</A>
  11 <P>
  12 <HR>
  13 <P>
  14 <H1>SETcc -- Byte Set on Condition</H1>
  15
  16
  17 <PRE>
  18 Opcode   Instruction  Clocks  Description
  19
  20 0F  97   SETA r/m8    4/5     Set byte if above (CF=0 and ZF=0)
  21 0F  93   SETAE r/m8   4/5     Set byte if above or equal (CF=0)
  22 0F  92   SETB r/m8    4/5     Set byte if below (CF=1)
  23 0F  96   SETBE r/m8   4/5     Set byte if below or equal (CF=1 or (ZF=1)
  24 0F  92   SETC r/m8    4/5     Set if carry (CF=1)
  25 0F  94   SETE r/m8    4/5     Set byte if equal (ZF=1)
  26 0F  9F   SETG r/m8    4/5     Set byte if greater (ZF=0 or SF=OF)
  27 0F  9D   SETGE r/m8   4/5     Set byte if greater or equal (SF=OF)
  28 0F  9C   SETL r/m8    4/5     Set byte if less (SF<>OF)
  29 0F  9E   SETLE r/m8   4/5     Set byte if less or equal (ZF=1 and
  30                               SF<>OF)
  31 0F  96   SETNA r/m8   4/5     Set byte if not above (CF=1)
  32 0F  92   SETNAE r/m8  4/5     Set byte if not above or equal (CF=1)
  33 0F  93   SETNB r/m8   4/5     Set byte if not below (CF=0)
  34 0F  97   SETNBE r/m8  4/5     Set byte if not below or equal (CF=0 and
  35                               ZF=0)
  36 0F  93   SETNC r/m8   4/5     Set byte if not carry (CF=0)
  37 0F  95   SETNE r/m8   4/5     Set byte if not equal (ZF=0)
  38 0F  9E   SETNG r/m8   4/5     Set byte if not greater (ZF=1 or SF<>OF)
  39 0F  9C   SETNGE r/m8  4/5     Set if not greater or equal (SF<>OF)
  40 0F  9D   SETNL r/m8   4/5     Set byte if not less (SF=OF)
  41 0F  9F   SETNLE r/m8  4/5     Set byte if not less or equal (ZF=1 and
  42                               SF<>OF)
  43 0F  91   SETNO r/m8   4/5     Set byte if not overflow (OF=0)
  44 0F  9B   SETNP r/m8   4/5     Set byte if not parity (PF=0)
  45 0F  99   SETNS r/m8   4/5     Set byte if not sign (SF=0)
  46 0F  95   SETNZ r/m8   4/5     Set byte if not zero (ZF=0)
  47 0F  90   SETO r/m8    4/5     Set byte if overflow (OF=1)
  48 0F  9A   SETP r/m8    4/5     Set byte if parity (PF=1)
  49 0F  9A   SETPE r/m8   4/5     Set byte if parity even (PF=1)
  50 0F  9B   SETPO r/m8   4/5     Set byte if parity odd (PF=0)
  51 0F  98   SETS r/m8    4/5     Set byte if sign (SF=1)
  52 0F  94   SETZ r/m8    4/5     Set byte if zero (ZF=1)
  53 </PRE>
  54
  55 <H2>Operation</H2>
  56
  57 <PRE>
  58 IF condition THEN r/m8 := 1 ELSE r/m8 := 0; FI;
  59 </PRE>
  60
  61 <H2>Description</H2>
  62
  63 SETcc stores a byte at the destination specified by the effective address
  64 or register if the condition is met, or a 0 byte if the condition is not
  65 met.
  66
  67 <H2>Flags Affected</H2>
  68
  69 None
  70
  71 <H2>Protected Mode Exceptions</H2>
  72
  73 #GP(0) if the result is in a non-writable segment; #GP(0) for an illegal
  74 memory operand effective address in the CS, DS, ES, FS, or GS segments;
  75 #SS(0) for an illegal address in the SS segment; #PF(fault-code) for a page
  76 fault
  77
  78 <H2>Real Address Mode Exceptions</H2>
  79
  80 Interrupt 13 if any part of the operand would lie outside of the effective
  81 address space from 0 to 0FFFFH
  82
  83 <H2>Virtual 8086 Mode Exceptions</H2>
  84
  85 Same exceptions as in Real Address Mode; #PF(fault-code) for a page
  86 fault
  87
  88
  89 <P>
  90 <HR>
  91 <P>
  92 <B>up:</B> <A HREF="c17.htm">
  93 Chapter 17 -- 80386 Instruction Set</A><BR>
  94 <B>prev:</B><A HREF="SCAS.htm"> SCAS/SCASB/SCASW/SCASD Compare String Data</A><BR>
  95 <B>next:</B><A HREF="SGDT.htm"> SGDT/SIDT Store Global/Interrupt Descriptor Table Register</A>
  96 </BODY>