Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Uživatelský manuál stáhnout pdf (Strana 170)

7 DETAILS OF INSTRUCTIONS

162

EPSON

S1C33 FAMILY C33 PE CORE MANUAL

sub %rd, %rs

Function

Subtraction

Standard) rd

← rd - rs

Extension 1) rd

← rs - imm13

Extension 2) rd

← rs - imm26

Code

15 12 11 8 7 4 3 0

0 0 1 0 0 1 1 0

r s r d

0x26__

Flag

IE C V Z N

–

↔ ↔ ↔ ↔

Mode

Src: Register direct %rs = %r0 to %r15

Dst: Register direct

%rd = %r0 to %r15

CLK

One cycle

Description

(1) Standard

sub

%rd,%rs ; rd ← rd - rs

The content of the rs register is subtracted from the rd register.

(2) Extension 1

ext

imm13

sub

%rd,%rs ; rd ← rs - imm13

The 13-bit immediate

imm13 is subtracted from the content of the rs register after being zero-

extended, and the result is loaded into the rd register. The content of the rs register is not

altered.

(3) Extension 2

ext

imm13 ; = imm26(25:13)

ext

imm13 ; = imm26(12:0)

sub

%rd,%rs ; rd ← rs - imm26

The 26-bit immediate

imm26 is subtracted from the content of the rs register after being zero-

extended, and the result is loaded into the rd register. The content of the rs register is not

altered.

(4) Delayed instruction

This instruction may be executed as a delayed instruction by writing it directly after a branch

instruction with the “d” bit. In this case, extension of the immediate by the ext instruction

cannot be performed.

Example

(1) sub %r0,%r0 ; r0 = r0 - r0

(2)

ext 0x1

ext 0x1fff

sub %r1,%r2 ; r1 = r2 - 0x3fff

1 2 ... 165 166 167 168 169 170 171 172 173 174 175 ... 180 181

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