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Avoid legacy instruction penalties on x86

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Justine Tunney 2024-07-31 01:02:24 -07:00
parent 1fba310e22
commit 8d8aecb6d9
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GPG key ID: BE714B4575D6E328
16 changed files with 199 additions and 158 deletions
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26
libc/testlib/benchmark.h Normal file
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#ifndef COSMOPOLITAN_LIBC_TESTLIB_BENCHMARK_H_
#define COSMOPOLITAN_LIBC_TESTLIB_BENCHMARK_H_
#include "libc/calls/struct/timespec.h"
#include "libc/stdio/stdio.h"
COSMOPOLITAN_C_START_
#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 long work = ((WORK_PER_RUN) ? (WORK_PER_RUN) : 1) * (ITERATIONS); \
double nanos = \
(timespec_tonanos(timespec_sub(timespec_real(), start)) + work - 1) / \
(double)work; \
if (nanos < 1000) { \
printf("%10g ns %2dx %s\n", nanos, (ITERATIONS), #CODE); \
} else { \
printf("%10lld ns %2dx %s\n", (long long)nanos, (ITERATIONS), #CODE); \
} \
} while (0)
COSMOPOLITAN_C_END_
#endif /* COSMOPOLITAN_LIBC_TESTLIB_BENCHMARK_H_ */