CoMPare register against upper and lower bounds

NAME
	Cmp2 -- Compare register against upper and lower bounds	(68020+)

SYNOPSIS
	CMP2	<ea>,Rn

FUNCTION
	Used to compare value of Rn (Dn or An) with two lower and upper
	bounds, which are stored in memory, at address given by <ea> (in
	two adjacent areas).
	Lower bound have to be stored before upper bound. Flags are set
	following to the result of comparison.

	If Rn is a data register Dn, and if operation is made on 8 or
	16 bits, only the 8 or 16 bits of Dn are taken in count.
	In opposite, in the case of Rn as an address register and if a 16
	bits operation is granted, the 32 bits of An are compared to bounds
	which are, them, extended on 32 bits by their signs.


FORMAT
	                                                  <ea>
	----------------------------------------=========================
	|15 |14 |13 |12 |11 |10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
	|---|---|---|---|---|-------|---|---|---|-----------|-----------|
	| 0 | 0 | 0 | 0 | 0 | SIZE  | 0 | 1 | 1 |   MODE    | REGISTER  |
	|---|-----------|---|-------|---|---|---|-----------|-----------|
	|D/A| REGISTER  | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
	-----------------------------------------------------------------

REGISTER
	Register specifies the register Rn which contains the value to test.
	If D/A = 0: Rn = Dn
	If D/A = 1: Rn = An
	<ea> specifies bounds, addressing modes allowed are:
	--------------------------------- -------------------------------
	|Addressing Mode|Mode| Register | |Addressing Mode|Mode|Register|
	|-------------------------------| |-----------------------------|
	|      Dn       | -  |     -    | |    Abs.W      |111 |  000   |
	|-------------------------------| |-----------------------------|
	|      An       | -  |     -    | |    Abs.L      |111 |  001   |
	|-------------------------------| |-----------------------------|
	|     (An)      |010 |N reg. An| |   (d16,PC)    |111 |  010   |
	|-------------------------------| |-----------------------------|
	|     (An)+     | -  |     -    | |   (d8,PC,Xi)  |111 |  011   |
	|-------------------------------| |-----------------------------|
	|    -(An)      | -  |     -    | |   (bd,PC,Xi)  |111 |  011   |
	|-------------------------------| |-----------------------------|
	|    (d16,An)   |101 |N reg. An| |([bd,PC,Xi],od)|111 |  011   |
	|-------------------------------| |-----------------------------|
	|   (d8,An,Xi)  |110 |N reg. An| |([bd,PC],Xi,od)|111 |  011   |
	|-------------------------------| |-----------------------------|
	|   (bd,An,Xi)  |110 |N reg. An| |    #data      | -  |   -    |
	|-------------------------------| -------------------------------
	|([bd,An,Xi]od) |110 |N reg. An|
	|-------------------------------|
	|([bd,An],Xi,od)|110 |N reg. An|
	---------------------------------

SIZE
	00->one Byte operation
	01->one Word operation
	10->one Long operation

RESULT
	X - Not affected
	N - Undefined.
	Z - Set if Rn is equal to one of the two bounds. Cleared otherwise.
	V - Undefined.
	C - Set if Rn is out of bounds. Cleared otherwise.

SEE ALSO
	CMP  CMPI CMPA
	CHK2

HTML Conversion by AG2HTML.pl V2.941126c, perl $RCSfile: cmp2.HTML,v $$Revision: 1.1 $$Date: 1999/09/14 21:14:08 $ Patch level: 36 & witbrock@cs.cmu.edu