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C–1
Appendix C
Instruction Summary
This appendix summarizes all instructions and opcodes in the Alpha architecture. All values
are in hexadecimal radix.
C.1 Common Architecture Instruction Summary
This section summarizes all common Alpha instructions. Table C–1 describes the contents of
the Format and Opcode columns in Table C–2.
Table C–2 shows qualifiers for operate format instructions. Qualifiers for IEEE and VAX
floating-point instructions are shown in Sections C.2 and C.3, respectively.
Table C–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/ func code Mfc oo.ffff oo is the 6-bit opcode field
ffff is the 16-bit function code in the dis-
placement field
Memory/ branch Mbr oo.h oo is the 6-bit opcode field
h is the high-order two bits of the displace-
ment field
Operate Opr oo.ff oo is the 6-bit opcode field
ff is the 7-bit function code field
PALcode Pcd oo oo is the 6-bit opcode field; the particular
PALcode instruction is specified in the
26-bit function code field.