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B. Performance Instrumentation
B.3 PCR/PIC Accesses
An example of the operational flow in using the performance instrumentation is
shown in Figure B-3.
Figure B-3 PCR/PIC Operational Flow
B.4 Performance Instrumentation Counter Events
B.4.1 Instruction Execution Rates
Cycle_cnt [PIC0,PIC1]
Accumulated cycles. This is similar to the SPARC-V9 TICK register, except that
cycle counting is controlled by the PCR.UT and PCR.ST fields.
Instr_cnt [PIC0,PIC1]
The number of instructions completed. Annulled, mispredicted or trapped
instructions are not counted.
start
set up PCR
end
sel → PCR.sel
accumulate stat
PIC[PCR.sel] → Rd
in PIC
accumulate stat
in PIC
context switch to B
PCR → [saveA1]
PIC → [saveA2]
switch to context B
context switch to A
[saveA1] → PCR
[saveA2] → PIC
PIC[PCR.sel] → Rd
back to context A
accumulate stat
in PIC
PIC[PCR.sel] → Rd
[0,1] → PCR.UT/ST
[0,1] → PCR.PRIV
PIC[PCR.sel] → Rd
PIC[PCR.sel] → Rd
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