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UM018809-0611 LDES Instruction

ZNEO

CPU Core

User Manual

121

LDES

Definition

Load and Extend Sign

Syntax

LDES dst

Operation

dst[31:0]

 S

Description

This instruction loads the destination register with FFFF_FFFFH if the S flag is 1. Otherwise, it

clears the destination register to 0000_0000H. This instruction can be used in multiprecision

arithmetic to extend the sign of a low-order result into a register used for high-order values.

Flags

Flags are not affected by this instruction.

Syntax and Opcodes

Examples

Before:

S=1

LDES R13 ;Object Code: 453D

After:

R13=FFFF_FFFFH

Before: S=0

LDES R13 ;Object Code: 453D

After:

R13=0000_0000H

Instruction, Operands Word 0 Word 1 Word 2

LDES Rd {453H, Rd}

1 2 ... 132 133 134 135 136 137 138 139 140 141 142 ... 215 216

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