Intel i86W Manual page 12

TABLE OF CONTENTS
CHAPTER 5 Page
CORE INSTRUCTIONS
5.1 LOAD INTEGER ................................. ..... ........................................................................ 5-3
5.2 STORE INTEGER ............................................................................................................ 5-4
5.3 TRANSFER INTEGER TO F-P REGISTER ...................................................................... 5-5
5.4 LOAD FLOATING-POINT ................................................................................................ 5-6
5.5 STORE FLOATING-POINT .............................................................................................. 5-8
5.6 PIXEL STORE .................................................................................... ........ ..................... 5-9
5.7 INTEGER ADD AND SUBTRACT .................................................................................. 5-10
5.8 SHIFT INSTRUCTIONS ................................................................................................. 5-12
5.9 SOFTWARE TRAPS ...................................................................................................... 5-13
5.10 LOGICAL INSTRUCTIONS ............................................ ................ ........................ ...... 5-14
5.11 CONTROL-TRANSFER INSTRUCTIONS .................................................................... 5-16
5.12 CONTROL REGISTER ACCESS .............. .............. ...................... ............................... 5-20
5.13 CACHE FLUSH ........................................................................................................... 5-21
5.14 BUS LOCK .................... .............................................................................................. 5-23
CHAPTER 6
FLOATING-POINT INSTRUCTIONS
6.1 PRECISION SPECIFICATION ......................................................................................... 6-1
6.2 PIPELINED AND SCALAR OPERATIONS ...................................................................... 6-2
6.2.1 Scalar Mode............................................................. ................................... ................. 6-4
6.2.2 Pipelining Status Information ....................................................................................... 6-4
6.2.3 Precision in the Pipelines ................................................... ......................................... 6-4
6.2.4 Transition between Scalar and Pipelined Operations ............................. ,................... 6-5
6.3 MULTIPLIER INSTRUCTIONS ........................................................................... ,............ 6-5
6.3.1 Floating-Point Multiply ................................................................ ................................. 6-7
6.3.2 Floating-Point Multiply Low.................. ........... ..... ...................... ................. ................. 6-8
6.3.3 Floating-Point Reciprocals ............................................. .............................................. 6-9
6.4 ADDER INSTRUCTIONS ................................................................................................. 6-9
6.4.1 Floating-Point Add and Subtract ................................ ............ ...... ...... ........ ............... 6-10
Q.4.2 Floating-Point Compares ....................................................... ........... ......................... 6-12
6.4.3 Floating-Point to Integer Conversion................................... ............. ......................... 6-13
6.5 DUAL OPERAT!ON INSTRUCTIONS ............................................................................ 6-14
6.6 GRAPHICS UNIT ........................................................................................................... 6-26
6.6.1 Long-Integer Arithmetic ....................... ........... ......... ............................ ........ .............. 6-28
6.6.2 3-D Graphics Operations ............................................... ............................................ 6-28
6.6.2.1 Z-BUFFER CHECK INSTRUCTIONS ...................................................................... 6-29
6.6.2.2 PIXEL ADD ........ .............................................. ..................... ........... .......... .............. 6-32
6.6.2.3 Z-BUFFER ADD ............ .......... ........... ............................... .............. ........................ 6-36
6.6.2.4 OR WITH MERGE REGISTER ................................................................................ 6-38
6.7 TRANSFER F-P TO INTEGER REGISTER .................................................................... 6-39
6.8 DUAL-INSTRUCTION MODE ........................................................................................ 6-40
6.8.1 Core and Floating-Point Instruction Interaction ..
~....................................................
6-41
6.8.2 Dual-Instruction Mode Restrictions ...................... ................ ...................... .............. 6-42
CHAPTER 7
TRAPS AND INTERRUPTS
7.1 TYPES OF TRAPS .......................................................................................................... 7-1
7.2 TRAP HANDLER INVOCATION ..................................................................................... 7-1
7.2.1 Saving State ................................................................................................................. 7-2
7.2.2 Inside the Trap Handler ............................................... :............................................... 7-3
7.2.3 Returning from the Trap Handler ................................................................................ 7-3
7.2.3.1 DETERMINING WHERE TO RESUME ..................................................................... 7-4
viii