Replace the two separate volatile counters (s_idle_ticks, s_busy_ticks)
with a two-element array s_ticks[2]:
[0] = idle ticks (xTaskGetCurrentTaskHandle() != s_idle_handle → false → 0)
[1] = busy ticks (xTaskGetCurrentTaskHandle() != s_idle_handle → true → 1)
The tick hook becomes a single branchless statement:
s_ticks[xTaskGetCurrentTaskHandle() != s_idle_handle]++;
This eliminates the conditional branch from the tick ISR at the cost
of a few additional instructions in IRAM. On Xtensa LX7 the branch
is somewhat unpredictable — the system alternates between idle and
busy — so removing the misprediction penalty (~5–10 cycles/call)
outweighs the slightly larger code size.
_onSample() is updated to read s_ticks[0] (idle) and s_ticks[1]
(busy) accordingly. All other logic is unchanged.
Valentin V. Bartenev
72fc497980