Instruction: Get the negative of a number's absolute value.

ABSNEG NValue, < # > SValue

Result: Absolute negative of SValue is stored in NValue.

NValue (d-field) is the register in which to write the negative of SValue's absolute value.
SValue (s-field) is a register or a 9-bit literal whose absolute negative value will be written to NValue.

Opcode Table:

–INSTR– ZCRI –CON– –DEST– –SRC–	Z Result	C Result	Result	Clocks
101011 001i 1111 ddddddddd sssssssss	Result = 0	S[31]	Written	4

Concise Truth Table:

In					Out
Destination	Source	Z	C	Effects	Destination	Z	C
$----_----; -	$0000_0001; 1	-	-	wz wc	$FFFF_FFFF; -1	0	0
$----_----; -	$0000_0000; 0	-	-	wz wc	$0000_0000; 0	1	0
$----_----; -	$FFFF_FFFF; -1	-	-	wz wc	$FFFF_FFFF; -1	0	1
$----_----; -	$7FFF_FFFF; 2,147,483,647	-	-	wz wc	$8000_0001; -2,147,483,647	0	0
$----_----; -	$8000_0000; -2,147,483,648	-	-	wz wc	$8000_0000; -2,147,483,648	0	1
$----_----; -	$8000_0001; -2,147,483,647	-	-	wz wc	$8000_0001; -2,147,483,647	0	1

Explanation

ABSNEG negates the absolute value of SValue and writes the result into NValue.

If the WZ effect is specified, the Z flag is set (1) if SValue is zero. If the WC effect is specified, the C flag is set (1) if SValue is negative, or cleared (0) if SValue is positive. The result is written to NValue unless the NR effect is specified.

Literal SValues are zero-extended, so ABS is really best used with register SValues.