harfbuzz/perf/benchmark-map.cc

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/*
* Benchmarks for hb_map_t operations.
*/
#include "benchmark/benchmark.h"
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#include <cassert>
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#include <cstdlib>
#include "hb.h"
void RandomMap(unsigned size, hb_map_t* out) {
hb_map_clear(out);
srand(size);
for (unsigned i = 0; i < size; i++) {
while (true) {
hb_codepoint_t next = rand();
if (hb_map_has (out, next)) continue;
hb_map_set (out, next, rand ());
break;
}
}
}
/* Insert a single value into map of varying sizes. */
static void BM_MapInsert(benchmark::State& state) {
unsigned map_size = state.range(0);
hb_map_t* original = hb_map_create ();
RandomMap(map_size, original);
assert(hb_map_get_population(original) == map_size);
auto needle = map_size / 2;
auto v = 0;
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for (auto _ : state) {
// TODO(garretrieger): create a copy of the original map.
// Needs a hb_map_copy(..) in public api.
hb_map_set (original, needle++, v++);
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}
hb_map_destroy(original);
}
BENCHMARK(BM_MapInsert)
->Range(1 << 4, 1 << 20);
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/* Single value lookup on map of various sizes. */
static void BM_MapLookup(benchmark::State& state) {
unsigned map_size = state.range(0);
hb_map_t* original = hb_map_create ();
RandomMap(map_size, original);
assert(hb_map_get_population(original) == map_size);
auto needle = map_size / 2;
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for (auto _ : state) {
benchmark::DoNotOptimize(
hb_map_get (original, needle++));
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}
hb_map_destroy(original);
}
BENCHMARK(BM_MapLookup)
->Range(1 << 4, 1 << 20); // Map size
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BENCHMARK_MAIN();