mirror of
https://github.com/GerbilSoft/zlib-ng.git
synced 2025-06-19 03:55:39 -04:00
00a3168d5d
Improve the speed of sub-16 byte matches by first using a 128-bit intrinsic, after that use only 512-bit intrinsics. This requires us to overlap on the last run, but this is cheaper than processing the tail using a 256-bit and then a 128-bit run. Change benchmark steps to avoid it hitting chunk boundaries of one or the other function as much, this gives more fair benchmarks.
97 lines
2.8 KiB
C++
97 lines
2.8 KiB
C++
/* benchmark_compare256.cc -- benchmark compare256 variants
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* Copyright (C) 2022 Nathan Moinvaziri
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* For conditions of distribution and use, see copyright notice in zlib.h
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*/
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#include <stdio.h>
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#include <benchmark/benchmark.h>
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extern "C" {
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# include "zbuild.h"
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# include "zutil_p.h"
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# include "arch_functions.h"
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# include "../test_cpu_features.h"
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# include "arch/generic/compare256_p.h"
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}
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#define MAX_COMPARE_SIZE (256)
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class compare256: public benchmark::Fixture {
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private:
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uint8_t *str1;
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uint8_t *str2;
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public:
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void SetUp(const ::benchmark::State& state) {
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str1 = (uint8_t *)zng_alloc(MAX_COMPARE_SIZE);
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assert(str1 != NULL);
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memset(str1, 'a', MAX_COMPARE_SIZE);
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str2 = (uint8_t *)zng_alloc(MAX_COMPARE_SIZE);
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assert(str2 != NULL);
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memset(str2, 'a', MAX_COMPARE_SIZE);
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}
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void Bench(benchmark::State& state, compare256_func compare256) {
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int32_t match_len = (int32_t)state.range(0) - 1;
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uint32_t len = 0;
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str2[match_len] = 0;
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for (auto _ : state) {
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len = compare256((const uint8_t *)str1, (const uint8_t *)str2);
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}
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str2[match_len] = 'a';
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benchmark::DoNotOptimize(len);
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}
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void TearDown(const ::benchmark::State& state) {
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zng_free(str1);
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zng_free(str2);
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}
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};
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#define BENCHMARK_COMPARE256(name, fptr, support_flag) \
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BENCHMARK_DEFINE_F(compare256, name)(benchmark::State& state) { \
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if (!support_flag) { \
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state.SkipWithError("CPU does not support " #name); \
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} \
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Bench(state, fptr); \
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} \
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BENCHMARK_REGISTER_F(compare256, name)->Arg(1)->Arg(10)->Arg(40)->Arg(80)->Arg(100)->Arg(175)->Arg(256);
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#ifdef DISABLE_RUNTIME_CPU_DETECTION
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BENCHMARK_COMPARE256(native, native_compare256, 1);
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#else
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BENCHMARK_COMPARE256(8, compare256_8, 1);
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BENCHMARK_COMPARE256(16, compare256_16, 1);
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#if defined(HAVE_BUILTIN_CTZ)
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BENCHMARK_COMPARE256(32, compare256_32, 1);
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#endif
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#if defined(HAVE_BUILTIN_CTZLL)
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BENCHMARK_COMPARE256(64, compare256_64, 1);
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#endif
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#if defined(X86_SSE2) && defined(HAVE_BUILTIN_CTZ)
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BENCHMARK_COMPARE256(sse2, compare256_sse2, test_cpu_features.x86.has_sse2);
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#endif
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#if defined(X86_AVX2) && defined(HAVE_BUILTIN_CTZ)
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BENCHMARK_COMPARE256(avx2, compare256_avx2, test_cpu_features.x86.has_avx2);
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#endif
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#if defined(X86_AVX512) && defined(HAVE_BUILTIN_CTZLL)
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BENCHMARK_COMPARE256(avx512, compare256_avx512, test_cpu_features.x86.has_avx512_common);
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#endif
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#if defined(ARM_NEON) && defined(HAVE_BUILTIN_CTZLL)
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BENCHMARK_COMPARE256(neon, compare256_neon, test_cpu_features.arm.has_neon);
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#endif
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#ifdef POWER9
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BENCHMARK_COMPARE256(power9, compare256_power9, test_cpu_features.power.has_arch_3_00);
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#endif
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#ifdef RISCV_RVV
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BENCHMARK_COMPARE256(rvv, compare256_rvv, test_cpu_features.riscv.has_rvv);
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#endif
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#endif
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