Conditional branch
NAME
Bcc -- Conditional branch
SYNOPSIS
Bcc <label>
Size = (Byte, Word, Long*)
* 68020+ only
FUNCTION
If condition true then program execution continues at:
(PC) + offset.
PC value is instruction address more two.
Offset is the relative value in bytes which separate Bcc instruction
of mentioned label.
Condition code 'cc' specifies one of the following:
0000 F False Z = 1 1000 VC oVerflow Clear V = 0
0001 T True Z = 0 1001 VS oVerflow Set V = 1
0010 HI HIgh C + Z = 0 1010 PL PLus N = 0
0011 LS Low or Same C + Z = 1 1011 MI MInus N = 1
0100 CC Carry Clear C = 0 1100 GE Greater or Equal N (+) V = 0
0101 CS Carry Set C = 1 1101 LT Less Than N (+) V = 1
0110 NE Not Equal Z = 0 1110 GT Greater Than Z + (N (+) V) = 0
0111 EQ EQual Z = 1 1111 LE Less or Equal Z + (N (+) V) = 1
FORMAT
-----------------------------------------------------------------
|15 |14 |13 |12 |11 |10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---------------|-------------------------------|
| 0 | 1 | 1 | 0 | CONDITION | 8 BITS OFFSET |
|---------------------------------------------------------------|
| 16 BITS OFFSET, IF 8 BITS OFFSET = $00 |
|---------------------------------------------------------------|
| 32 BITS OFFSET, IF 8 BITS OFFSET = $FF |
-----------------------------------------------------------------
RESULT
None.
SEE ALSO
BRA DBcc Scc
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Patch level: 36
& witbrock@cs.cmu.edu