Create benchmarking library

benchmarks/include/benchmarking.h

@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) Camden Dixie O'Brien
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+#ifndef BENCHMARKING_H
+#define BENCHMARKING_H
+
+#include <time.h>
+
+typedef struct {
+	int reps;
+	double total, median, mean, min, max, stddev;
+} benchmark_summary_t;
+
+#define CLOCK_MICROS(c) (1000000 * (double)c / CLOCKS_PER_SEC)
+
+#define BENCHMARKING_BEGIN() benchmark_print_header()
+#define BENCHMARKING_END() 0
+
+#define START_CLOCK() \
+	do { \
+		benchmark_start = clock(); \
+	} while (0)
+
+#define STOP_CLOCK() \
+	do { \
+		benchmark_end = clock(); \
+	} while (0)
+
+#define RUN_BENCHMARK(reps, name, fn, ...) \
+	do { \
+		double res[reps]; \
+		for (int i = 0; i < reps; ++i) { \
+			fn(__VA_ARGS__); \
+			res[i] = CLOCK_MICROS(benchmark_end) \
+			    - CLOCK_MICROS(benchmark_start); \
+		} \
+		benchmark_summary_t summary; \
+		benchmark_summarise(res, reps, &summary); \
+		benchmark_print(name, &summary); \
+	} while (0)
+
+extern clock_t benchmark_start, benchmark_end;
+
+void benchmark_summarise(double *res, int reps, benchmark_summary_t *out);
+void benchmark_print_header(void);
+void benchmark_print(const char *name, const benchmark_summary_t *summary);
+
+#endif