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Copyright 2002, 2003 ARM Limited. All rights reserved.
ARM DDI 0238B
VFP9-S r0p2 Vector Floating-point Coprocessor
Technical Reference Manual
Copyright 2002, 2003 ARM Limited. All rights reserved.
Release Information
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may be adapted or reproduced in any material form except with the prior written permission of the copyright
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particulars of the product and its use contained in this document are given by ARM Limited in good faith.
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merchantability, or fitness for purpose, are excluded.
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such information, or any incorrect use of the product.
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Web Address
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Change history
Date
Issue
Change
10 April, 2002
A
First release
20 October, 2003
B
First release for r0p2
ARM DDI 0238B
Copyright 2002, 2003 ARM Limited. All rights reserved.
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Contents
VFP9-S r0p2 Vector Floating-point
Coprocessor Technical Reference Manual
Preface
About this manual ......................................................................................... xii
Feedback ...................................................................................................... xv
Chapter 1
Introduction
1.1
About the VFP9-S coprocessor ................................................................. 1-2
1.2
Applications ................................................................................................. 1-3
1.3
Coprocessor interface ................................................................................. 1-4
1.4
VFP9-S pipelines ........................................................................................ 1-5
1.5
Modes of operation ................................................................................... 1-12
1.6
Short vector instructions ........................................................................... 1-15
1.7
Using CPBURST ....................................................................................... 1-16
1.8
Parallel execution of instructions ............................................................... 1-17
1.9
VFP9-S treatment of branch instructions .................................................. 1-18
1.10
Writing optimal VFP9-S code .................................................................... 1-19
1.11
Clocking .................................................................................................... 1-20
1.12
Testing ...................................................................................................... 1-21
1.13
Silicon revision information ....................................................................... 1-22
Contents
iv
Copyright 2002, 2003 ARM Limited. All rights reserved.
ARM DDI 0238B
Chapter 2
Register File
2.1
About the register file .................................................................................. 2-2
2.2
Register file internal formats ....................................................................... 2-3
2.3
Decoding the register file ............................................................................ 2-5
2.4
Loading operands from ARM registers ....................................................... 2-6
2.5
Maintaining consistency in register precision ............................................. 2-8
2.6
Data transfer between memory and VFP9-S registers ............................... 2-9
2.7
Access to register banks in CDP operations ............................................ 2-11
Chapter 3
Programmer's Model
3.1
About the programmer's model .................................................................. 3-2
3.2
Compliance with the IEEE 754 standard .................................................... 3-3
3.3
ARMv5TE coprocessor extensions ............................................................ 3-9
3.4
VFP9-S system control and status registers ............................................ 3-15
Chapter 4
Instruction Execution
4.1
About instruction execution ........................................................................ 4-2
4.2
Serializing instructions ................................................................................ 4-3
4.3
Interrupting the VFP9-S coprocessor ......................................................... 4-4
4.4
Forwarding .................................................................................................. 4-5
4.5
Hazards ...................................................................................................... 4-7
4.6
Operation of the scoreboard ....................................................................... 4-8
4.7
Parallel execution ..................................................................................... 4-23
4.8
Execution timing ....................................................................................... 4-26
Chapter 5
Exception Handling
5.1
About exception processing ....................................................................... 5-2
5.2
Support code .............................................................................................. 5-3
5.3
Illegal instructions ....................................................................................... 5-6
5.4
Determination of the trigger instruction ....................................................... 5-7
5.5
Input Subnormal exception ....................................................................... 5-12
5.6
Invalid Operation exception ...................................................................... 5-13
5.7
Division-by-Zero exception ....................................................................... 5-16
5.8
Overflow exception ................................................................................... 5-17
5.9
Underflow exception ................................................................................. 5-19
5.10
Inexact exception ...................................................................................... 5-21
5.11
Input exceptions ....................................................................................... 5-22
5.12
Arithmetic exceptions ............................................................................... 5-23
Chapter 6
Design for Test
6.1
VFP9-S coprocessor .................................................................................. 6-2
6.2
VFP9-S test wrapper .................................................................................. 6-3
6.3
Test Pins ..................................................................................................... 6-6
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