Trace Events

Trace Events define which events are generated and captured while tracing. The window Event Counters shows the result.

• CPI: Cycles per Instruction A general counter for instruction cycle count estimation. This counter increments on each additional cycle required to execute a multi-cycle instruction. The counter also increments on each cycle of any instruction fetch stall. The first cycle of an instruction and those recorded by the LSU are not counted.
• EXC: Exception Overhead The counter increments on each cycle associated with exception entry or return. That is, it counts the cycles associated with entry stacking, return unstacking, preemption, and other exception-related processes.
• SLEEP: Sleep Cycles The counter increments on each cycle associated with power saving, whether initiated by a WFI or WFE instruction, or by the sleep-on-exit functionality.
• LSU: Load Store Unit Cycles This counter increments on each additional cycle required to execute a multi-cycle load-store instruction. It does not count the first cycle required to execute any instruction.
• FOLD: Folded Instructions The counter increments on any instruction that executes in zero cycles (for example, an IT instruction is folded and does not use any cycles).
• EXCTRC: Exception Tracing The counter increments on exceptions, interrupt entries, and interrupt exits. The window Trace Exceptions shows the statistics and the Event Viewer their execution over time.

Note

• When too many data are generated and the Status Bar shows a data overflow message, reduce the generated events here.