Pcr/Pic Accesses; Performance Instrumentation Counter Events - Sun Microsystems UltraSPARC-I User Manual

B.3 PCR/PIC Accesses
An example of the operational flow in using the performance instrumentation is
shown in Figure B-3.
set up PCR
sel
[0,1]
[0,1]
PIC[PCR.sel]
accumulate stat
PIC[PCR.sel]
accumulate stat
Figure B-3
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]
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The number of instructions completed. Annulled, mispredicted or trapped
start
PCR.sel
PCR.UT/ST
PCR.PRIV
Rd
in PIC
Rd
in PIC
PCR/PIC Operational Flow
B. Performance Instrumentation
context switch to B
PCR [saveA1]
PIC [saveA2]
PIC[PCR.sel] Rd
switch to context B
back to context A
context switch to A
[saveA1] PCR
[saveA2] PIC
PIC[PCR.sel] Rd
accumulate stat
in PIC
PIC[PCR.sel] Rd
end