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UM018809-0611 NEG Instruction

ZNEO

CPU Core

User Manual

127

NEG

Definition

Negate

Syntax

NEG dst

Operation

dst  0

– dst

Description

The contents of the destination operand are subtracted from zero, and the result is written to the

destination. This effectively performs a two’s complement negation.

Flags

Flags are set based on the 32-bit destination register value.

Syntax and Opcodes

76543210

C Z S V B CIRQE IRQE

*****–––

Legend

C = Set to 1 if the result generated a borrow; otherwise set to 0.

Z = Set to 1 if the result is zero; otherwise, set to 0.

S = Set to 1 if the result msb is 1; otherwise set to 0.

V = Set to 1 if an arithmetic overflow occurs; otherwise set to 0.

B = Set to 1 if the initial destination value was 0; otherwise set to 0.

CIRQE = No change.

IRQE = No change.

Instruction, Operands Word 0 Word 1 Word 2

NEG Rd {455H, Rd}

Note:

1 2 ... 138 139 140 141 142 143 144 145 146 147 148 ... 215 216

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