Alpha Instruction Set; A.1 Alpha Instruction Summary; Instruction Format And Opcode Notation - Compaq 21264 Hardware Reference Manual

This appendix provides a summary of the Alpha instruction set and describes the
21264/EV67 IEEE floating-point conformance. It is organized as follows:
•
Alpha instruction summary
•
Reserved opcodes
•
IEEE floating-point instructions
•
VAX floating-point instructions
•
Independent floating-point instructions
•
Opcode summary
•
Required PALcode function codes
•
IEEE floating-point conformance

A.1 Alpha Instruction Summary

This section contains a summary of all Alpha architecture instructions. All values are in
hexadecimal radix. Table A–1 describes the contents of the Format and Opcode col-
umns that are in Table A–2.
Table A–1 Instruction Format and Opcode Notation
Instruction Format
Branch
Floating-point
Memory
Memory/function code Mfc
Alpha 21264/EV67 Hardware Reference Manual
Format Opcode
Symbol Notation
Bra oo
F-P oo.fff
Mem oo
oo.ffff

Alpha Instruction Set

Meaning
oo is the 6-bit opcode field.
oo is the 6-bit opcode field.
fff is the 11-bit function code field.
oo is the 6-bit opcode field.
oo is the 6-bit opcode field.
ffff is the 16-bit function code in the displacement
field.
A
Alpha Instruction Set
A–1