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Add more tests for strlcpy()

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I asked ChatGPT o1 for an optimized version of strlcpy() but it couldn't
produce an implementation that didn't crash. Eventually it just gave up.
This commit is contained in:
Justine Tunney 2024-09-13 01:10:14 -07:00
parent e142124730
commit 1260f9d0ed
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GPG key ID: BE714B4575D6E328
2 changed files with 105 additions and 32 deletions
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51
libc/testlib/benchmark.h
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@ -7,24 +7,22 @@ COSMOPOLITAN_C_START_
#define X(x) __expropriate(x)
#define V(x) __veil("r", x)
#define BENCHMARK(ITERATIONS, WORK_PER_RUN, CODE) \
do { \
struct timespec start = timespec_mono(); \
for (int __i = 0; __i < ITERATIONS; ++__i) { \
asm volatile("" ::: "memory"); \
CODE; \
} \
double total_nanos = \
(double)timespec_tonanos(timespec_sub(timespec_mono(), start)); \
double total_work = \
(double)((WORK_PER_RUN) ? (WORK_PER_RUN) : 1) * (ITERATIONS); \
_print_benchmark_result(total_nanos, total_work, ITERATIONS, #CODE); \
#define BENCHMARK(ITERATIONS, WORK_PER_RUN, CODE) \
do { \
struct timespec start = timespec_real(); \
for (int __i = 0; __i < ITERATIONS; ++__i) { \
asm volatile("" ::: "memory"); \
CODE; \
} \
long ns = timespec_tonanos(timespec_sub(timespec_real(), start)); \
_print_benchmark_result(ns, WORK_PER_RUN, ITERATIONS, #CODE); \
} while (0)
static void _print_benchmark_result(double total_nanos, double total_work,
static void _print_benchmark_result(double total_nanos, double work_per_run,
int iterations, const char* code) {
double time_per_op = total_nanos / iterations;
double throughput = total_work / (total_nanos * 1e-9);
double time_per_op = total_nanos / (work_per_run * iterations);
double throughput = work_per_run / (total_nanos / iterations * 1e-9);
const char* throughput_unit;
const char* time_unit;
double time_value;
@ -50,29 +48,32 @@ static void _print_benchmark_result(double total_nanos, double total_work,
} else if (time_per_op >= 1e3) {
time_value = time_per_op / 1e3;
time_unit = "µs";
} else {
} else if (time_per_op >= .01) {
time_value = time_per_op;
time_unit = "ns";
} else {
time_value = time_per_op * 1e3;
time_unit = "ps";
}
// Determine work unit
const char* work_unit;
double work_value = total_work / iterations;
if (work_value >= 1e9) {
work_value /= 1e9;
if (work_per_run >= 1e9) {
work_per_run /= 1e9;
work_unit = "G";
} else if (work_value >= 1e6) {
work_value /= 1e6;
} else if (work_per_run >= 1e6) {
work_per_run /= 1e6;
work_unit = "M";
} else if (work_value >= 1e3) {
work_value /= 1e3;
} else if (work_per_run >= 1e3) {
work_per_run /= 1e3;
work_unit = "K";
} else {
work_unit = " ";
}
printf("%8.2f %-2s %6.2f %s/s %6.2f %s %2dx %s\n", time_value, time_unit,
throughput, throughput_unit, work_value, work_unit, iterations, code);
printf("%8.2f %-2s %8.2f %s/s %6.2f %s %2dx %s\n", time_value, time_unit,
throughput, throughput_unit, work_per_run, work_unit, iterations,
code);
}
COSMOPOLITAN_C_END_