Compaq ECQD2KCTE Laptop User Manual


 
Waivers and Implementation-Dependent Functionality E–19
Table E–11: 21164/21164PC Read Counters for OpenVMS Alpha and DIGITAL
UNIX
Bits Meaning When Returned
63:48 Counter 0 returned value
47:32 Counter 1 returned value
31:30 MBZ
29:16 Counter 2 returned value
15:1 MBZ
0 Set means success; clear means failure
Table E–12: 21164/21164PC Write Counters for OpenVMS Alpha and DIGITAL
UNIX
Bits Meaning
63:48 Counter 0 written value
47:32 Counter 1 written value
31:30 MBZ
29:16 Counter 2 written value
15:0 MBZ
Table E–13: 21164/21164PC Counter 1 (PCSEL1) Event Selection
The following values choose the counter 1 (PCSEL1) event selection:
Value Meaning
0 Nothing issued, pipeline frozen
1 Some but not all issuable instructions issued
2 Nothing issued, pipeline dry
3 Replay traps (ldu, wb/maf, litmus test)
4 Single issue cycles
5 Dual issue cycles
6 Triple issue cycles
7 Quad issue cycles
8 Flow change (all branches, jsr-ret, hw_rei), where:
If PCSEL2 has value 3, flow change is a conditional branch
If PCSEL2 has value 2, flow change is a JSR-RET