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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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56
test/ctl/string_bench.cc
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@ -20,27 +20,13 @@
#include "ctl/utility.h"
#include "libc/dce.h"
#include "libc/mem/leaks.h"
#include "libc/testlib/benchmark.h"
#include "libc/calls/struct/timespec.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#define BENCH(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) * (ITERATIONS); \
double nanos = \
(timespec_tonanos(timespec_sub(timespec_real(), start)) + work - \
1) / \
(double)work; \
printf("%10g ns %2dx %s\n", nanos, (ITERATIONS), #CODE); \
} while (0)
const char* big_c = "aaaaaaaaaaaaaaaaaaaaaaaa";
const char* small_c = "aaaaaaaaaaaaaaaaaaaaaaa";
@ -55,98 +41,98 @@ main()
{
const ctl::string_view big(big_c), small(small_c);
BENCH(ITERATIONS * 10, 1, {
BENCHMARK(ITERATIONS * 10, 1, {
ctl::string s;
s.append("hello ");
s.append("world");
});
BENCH(ITERATIONS, 8, {
BENCHMARK(ITERATIONS, 8, {
ctl::string s;
for (int i = 0; i < 8; ++i) {
s.append('a');
}
});
BENCH(ITERATIONS, 16, {
BENCHMARK(ITERATIONS, 16, {
ctl::string s;
for (int i = 0; i < 16; ++i) {
s.append('a');
}
});
BENCH(ITERATIONS, 23, {
BENCHMARK(ITERATIONS, 23, {
ctl::string s;
for (int i = 0; i < 23; ++i) {
s.append('a');
}
});
BENCH(ITERATIONS, 24, {
BENCHMARK(ITERATIONS, 24, {
ctl::string s;
for (int i = 0; i < 24; ++i) {
s.append('a');
}
});
BENCH(ITERATIONS, 32, {
BENCHMARK(ITERATIONS, 32, {
ctl::string s;
for (int i = 0; i < 32; ++i) {
s.append('a');
}
});
BENCH(ITERATIONS, 1, { ctl::string s(small_c); });
BENCHMARK(ITERATIONS, 1, { ctl::string s(small_c); });
BENCH(ITERATIONS, 1, { ctl::string s(small); });
BENCHMARK(ITERATIONS, 1, { ctl::string s(small); });
{
ctl::string small_copy("hello world");
BENCH(ITERATIONS, 1, { ctl::string s2(small_copy); });
BENCHMARK(ITERATIONS, 1, { ctl::string s2(small_copy); });
}
BENCH(ITERATIONS, 1, {
BENCHMARK(ITERATIONS, 1, {
ctl::string s(small);
ctl::string s2(ctl::move(s));
});
BENCH(ITERATIONS, 1, {
BENCHMARK(ITERATIONS, 1, {
ctl::string s(small);
ctl::string s2(s);
});
BENCH(ITERATIONS, 1, { ctl::string s(big_c); });
BENCHMARK(ITERATIONS, 1, { ctl::string s(big_c); });
BENCH(ITERATIONS, 1, { ctl::string s(big); });
BENCHMARK(ITERATIONS, 1, { ctl::string s(big); });
{
ctl::string big_copy(big);
BENCH(ITERATIONS, 1, { ctl::string s2(big_copy); });
BENCHMARK(ITERATIONS, 1, { ctl::string s2(big_copy); });
}
BENCH(ITERATIONS, 1, {
BENCHMARK(ITERATIONS, 1, {
ctl::string s(big);
ctl::string s2(ctl::move(s));
});
BENCH(ITERATIONS, 1, {
BENCHMARK(ITERATIONS, 1, {
ctl::string s(big);
ctl::string s2(s);
});
BENCH(ITERATIONS, 1, { ctl::string s(23, 'a'); });
BENCHMARK(ITERATIONS, 1, { ctl::string s(23, 'a'); });
BENCH(ITERATIONS, 1, { ctl::string s(24, 'a'); });
BENCHMARK(ITERATIONS, 1, { ctl::string s(24, 'a'); });
{
ctl::string s(5, 'a');
BENCH(ITERATIONS, 1, { ctl::string_view s2(s); });
BENCHMARK(ITERATIONS, 1, { ctl::string_view s2(s); });
}
{
ctl::string big_trunc(48, 'a');
big_trunc.resize(4);
BENCH(ITERATIONS, 1, { ctl::string s(big_trunc); });
BENCHMARK(ITERATIONS, 1, { ctl::string s(big_trunc); });
}
CheckForMemoryLeaks();