Opcodes Reserved For Palcode; Ieee Floating-Point Instructions; Ieee Floating-Point Instruction Function Codes - Compaq 21264 Hardware Reference Manual

A.2.2 Opcodes Reserved for PALcode
Table A–4 lists the 21264/EV67-specific instructions. See Chapter 2 for more
information.
Table A–4 Opcodes Reserved for PALcode
21264/EV67
Mnemonic Opcode
HW_LD 1B
HW_ST 1F
HW_REI 1E
HW_MFPR 19
HW_MTPR 1D
A.3 IEEE Floating-Point Instructions
Table A–5 lists the hexadecimal value of the 11-bit function code field for the IEEE
floating-point instructions, with and without qualifiers. The opcode for these
instructions is 16
Table A–5 IEEE Floating-Point Instruction Function Codes
Mnemonic
ADDS
ADDT
CMPTEQ
CMPTLT
CMPTLE
CMPTUN
CVTQS
CVTQT
CVTST
CVTTQ
CVTTS
DIVS
DIVT
MULS
MULT
Alpha 21264/EV67 Hardware Reference Manual
Architecture
Mnemonic Function
PAL1B Performs Dstream load instructions.
PAL1F Performs Dstream store instructions.
PAL1E Returns instruction flow to the program counter (PC) pointed
to by EXC_ADDR internal processor register (IPR).
PAL19 Accesses the Ibox, Mbox, and Dcache IPRs.
PAL1D Accesses the Ibox, Mbox, and Dcache IPRs.
.
16
None /C /M
080 000 040
0A0 020 060
0A5 — —
0A6 — —
0A7 — —
0A4 — —
0BC 03C 07C
0BE 03E 07E
See — —
below
See — —
below
0AC 02C 06C
083 003 043
0A3 023 063
082 002 042
0A2 022 062

IEEE Floating-Point Instructions

/D /U /UC
0C0 180 100
0E0 1A0 120
— — —
— — —
— — —
— — —
0FC — —
0FE — —
— — —
— — —
0EC 1AC 12C
0C3 183 103
0E3 1A3 123
0C2 182 102
0E2 1A2 122
Alpha Instruction Set
/UM /UD
140 1C0
160 1E0
— —
— —
— —
— —
— —
— —
— —
— —
16C 1EC
143 1C3
163 1E3
142 1C2
162 1E2
A–9