Reserved Opcodes; A.2 Reserved Opcodes - Compaq 21264 Hardware Reference Manual

Reserved Opcodes

Table A–2 Architecture Instructions (Continued)
Mnemonic Format
STW Mem
SUBF F-P
SUBG F-P
SUBL Opr
SUBL/V Opr
SUBQ Opr
SUBQ/V Opr
SUBS F-P
SUBT F-P
TRAPB Mfc
UMULH Opr
UNPKBL Opr
UNPKBW Opr
WH64 Mfc
WMB Mfc
XOR Opr
ZAP Opr
ZAPNOT Opr

A.2 Reserved Opcodes

This section describes the opcodes that are reserved in the Alpha architecture. They can
be reserved for Compaq or for PALcode.
A.2.1 Opcodes Reserved for Compaq
Table A–3 lists opcodes reserved for Compaq.
Table A–3 Opcodes Reserved for Compaq
Mnemonic
OPC01
OPC02
OPC03
OPC04
Alpha Instruction Set
A–8
Opcode Description
0D Store word
15.081 Subtract F_floating
15.0A1 Subtract G_floating
10.09 Subtract longword
10.49 Subtract longword with integer overflow enable
10.29 Subtract quadword
10.69 Subtract quadword with integer overflow enable
16.081 Subtract S_floating
16.0A1 Subtract T_floating
18.0000 Trap barrier
13.30 Unsigned multiply quadword high
1C.35 Unpack bytes to longwords
1C.34 Unpack bytes to words
18.F800 Write hint — 64 bytes
18.4400 Write memory barrier
11.40 Logical difference
12.30 Zero bytes
12.31 Zero bytes not
Opcode Mnemonic
01 OPC05
02 OPC06
03 OPC07
04 —
Alpha 21264/EV67 Hardware Reference Manual
Opcode
05
06
07
—