User's Manual

inter
TABLE OF CONTENTS
Figure
Title Page
3-1 Software Routine to Recognize the 80287 ............................................................. 3-3
4-1 Conditional Branching for Compares ..................................................................... 4-2
4-2 Conditional Branching for FXAM ............................................................................ 4-2
4-3 Full-State Exception Handler .................................................................................. 4-5
4-4 Reduced-Latency Exception Handler ..................................................................... 4-5
4-5 Reentrant Exception Handler .................................................................................. 4-6
4-6 Floating-Point to
ASCII Conversion Routine .......................................................... 4-7
4-7 Calculating Trigonometric Functions ...................................................................... 4-18
Tables
Table Title Page
1-1 Numeric Processing Speed Comparisons .............................................................. 1-2
1-2 Numeric Data Types ................................................................................................ 1-6
1-3
Principal NPX Instructions ....................................................................................... 1-6
1-4
Interpreting the NPX Condition Codes ................................................................... 1-11
1-5 Real Number Notation ............................................................................................. 1-17
1-6 Rounding Modes ..................................................................................................... 1-19
1-7 Denormalization Process ........................................................................................ 1-22
1-8 Exceptions
Due to Denormal Operands ........................................ ......................... 1-23
1-9 Unnormal Operands and Results ............................................................................ 1-24
1-10 Zero Operands and Results .................................................................................... 1-26
1-11 Masked Overflow Response with Directed Rounding ........................................... 1-27
1-12
Infinity Operands and Results ................................................................................. 1-28
1-13 Binary
Integer Encodings ..................................................................... , .................. 1-29
1-14 Packed
Decimal Encodings ..................................................................................... 1-30
1-15 Real and Long Real Encodings ............................................................................... 1-31
1-16 Temporary Real Encodings ..................................................................................... 1-32
1-17 Exception Conditions
and Masked Responses ..................................................... 1-35
2-1 Data Transfer Instructions ...................................................................................... 2-3
2-2 Arithmetic Instructions ............................................................................................. 2-5
2-3 Basic Arithmetic Instructions and Operands .......................................................... 2-6
2-4 Condition Code Interpretation after FPREM ......................... ;................................ 2-9
2-5 Comparison Instructions ......................................................................................... 2-10
2-6 Condition Code Interpretation after FCOM ............................................................ 2-10
2-7 Condition Code Interpretation after FTST .............................................................. 2-11
2-8 FXAM Condition Code Settings ........................ .............. .................. ...................... 2-12
2-9 Transcendental Instructions .................................................................................... 2-13
2-10 Constant Instructions .............................................................................................. 2-14
2-11 Processor Control Instructions .............. ............................ ...... ............................... 2-15
2-12
Key to Operand Types ............................................................................................ 2-21
2- ~i 3 Execuiiur I PE:naitiE:5 ................................................................................................. 2-22
2-14 Instruction Set Reference Data ............................................................................... 2-24
2-15 PLfM-286
Built-In Procedures ................................................................................ 2-39
2-16
80287 Storage Allocation Directives .................................. ........................ ............. 2-40
2-17 Addressing Mode Examples ................................................................................... 2-43
3-1 NPX Processor State Following Initialization ......................................................... 3-5
3-2 Precedence of NPX Exceptions .............................................................................. 3-7
A-1 80287 Instruction Encoding .................................................................................... A-1
A-2 Machine Instruction Decoding Guide ...................................................................... A-2
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