MNEG

Purpose

move the arithmetic negation of a scalar quantity

Format

opcode src.rx, dst.wx

Operation

dst ß -scr;

Condition codes

N ß dst LSS 0;

Z ß dst EOL 0;

V ß overflow (Integer);

V ß 0 (floating);

C ß dst NEQ 0 (integer);

C ß 0 (floating);

Exceptions

Integer overflow; reserved operand (floating)

Opcodes

8E        MNEGB Move Negated Byte

AE       MNEGW Move Negated Word

CE       MNEGL Move Negated Long

52        MNEGF Move Negated Floating

72        MNEGD Move Negated Double

Description

The destination operand is replaced by the negative of the

source operand.

Notes

1. Integer overflow occurs if the source Operand is the largest negative integer (which has no positive counterpart).

On overflow, the destination operand is replaced by the source operand.

2. On floating reserved operand fault, the destination operand is unaffected and the condition codes are unpredictable.

3. If source is positive zero, result is positive zero. If source is reserved operand (minus zero), a reserved operand fault occurs. For all other floating point source values, bit 15 (sign bit) is complemented.