Compaq EV67 User Manual

Page of 356
Alpha 21264/EV67 Hardware Reference Manual
Alpha Instruction Set
A–9
IEEE Floating-Point Instructions
A.2.2 Opcodes Reserved for PALcode
Table A–4 lists the 21264/EV67-specific instructions. See Chapter 2 for more 
information.
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
16
.
Table A–4 Opcodes Reserved for PALcode
21264/EV67 
Mnemonic
Opcode
Architecture 
Mnemonic
Function
HW_LD
1B
PAL1B
Performs Dstream load instructions.
HW_ST
1F
PAL1F
Performs Dstream store instructions.
HW_REI
1E
PAL1E
Returns instruction flow to the program counter (PC) pointed 
to by EXC_ADDR internal processor register (IPR).
HW_MFPR
19
PAL19
Accesses the Ibox, Mbox, and Dcache IPRs.
HW_MTPR
1D
PAL1D
Accesses the Ibox, Mbox, and Dcache IPRs.
Table A–5 IEEE Floating-Point Instruction Function Codes 
Mnemonic
None
/C
/M
/D
/U
/UC
/UM
/UD
ADDS 
 080
000
040
0C0
180
100
140
1C0
ADDT 
 0A0
020
060
0E0
1A0
120
160
1E0
CMPTEQ
 0A5
 
CMPTLT
 
0A6
 
CMPTLE
 
0A7
 
CMPTUN
 
0A4
 
CVTQS 
 0BC
03C
07C
0FC
CVTQT 
 0BE
03E
07E
0FE
CVTST 
See
below
 
CVTTQ 
See
below
 
CVTTS 
 0AC
02C
06C
0EC
1AC
12C
16C
1EC
DIVS 
 083
003
043
0C3
183
103
143
1C3
DIVT 
 0A3
023
063
0E3
1A3
123
163
1E3
MULS 
 082
002
042
0C2
182
102
142
1C2
MULT 
 0A2
022
062
0E2
1A2
122
162
1E2