Compaq EV67 User Manual
Alpha 21264/EV67 Hardware Reference Manual
Alpha Instruction Set
A–1
A
Alpha Instruction Set
This appendix provides a summary of the Alpha instruction set and describes the
21264/EV67 IEEE floating-point conformance. It is organized as follows:
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.
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
Format
Symbol
Symbol
Opcode
Notation
Notation
Meaning
Branch
Bra
oo
oo is the 6-bit opcode field.
Floating-point
F-P
oo.fff
oo is the 6-bit opcode field.
fff is the 11-bit function code field.
fff is the 11-bit function code field.
Memory
Mem
oo
oo is the 6-bit opcode field.
Memory/function code Mfc
oo.ffff
oo is the 6-bit opcode field.
ffff is the 16-bit function code in the displacement
field.
ffff is the 16-bit function code in the displacement
field.