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21264/EV68A 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/EV68A 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
Format
Symbol
Opcode
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.
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.