Useful macro in C to measure time some code block takes !

chrono_macro.c

#define setupChrono() clock_t start; clock_t end; double cpu_time_used;
#define chrono(t, ...) start = clock();\
                    __VA_ARGS__;\
                    end = clock();\
                    cpu_time_used = ((double) (end - start)) * 1000 / CLOCKS_PER_SEC; \
                    printf("[PERFORMANCE] Name: %s | File: %s | Line: %d | Execution Time: %.3f ms\n", t,__FILE__, __LINE__, cpu_time_used);

Usage:

setupChrono()
chrono(
  "Name of the chrono",
  int a = 3;
  int b = 3;
  printf("%d %d \n", a, b);
)

setupChrono should be called once per code block as it defines variables going to be used by chrono.
Necessary to be able to run chrono multiple time without redefining variables x)