benchmark.h

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#ifndef BENCHMARK_H
#define BENCHMARK_H

static uint32_t _start, _baseline = 0;
static uint32_t _benchmark;

inline void noop() __attribute__((always_inline));
inline void noop() { __asm__ __volatile__("nop"); }

#define BENCHMARK_BASELINE(scale)                                       \
  Serial.flush();                                                       \
  _start = micros();                                                    \
  for (int _i = 1; _i; _i--, _baseline = micros() - _start - _baseline) \
    for (int _j = scale; _j; _j--, noop())

#define BENCHMARK(msg,scale)                                            \
  Serial.print(F(msg ": "));                                            \
  Serial.flush();                                                       \
  _start = micros();                                                    \
  for (int _i = 1; _i; _i--, _benchmark = micros() - _start - _baseline,\
         Serial.println(_benchmark / (float) scale, 3))                 \
    for (int _j = scale; _j; _j--, noop())

#define MEASURE(expr) BENCHMARK(#expr,1) expr

#endif