1 files changed, 86 insertions, 0 deletions
diff --git a/src/zlib-ng/test/benchmarks/benchmark_slidehash.cc b/src/zlib-ng/test/benchmarks/benchmark_slidehash.cc
new file mode 100644
index 0000000..655820e
--- /dev/null
+++ b/src/zlib-ng/test/benchmarks/benchmark_slidehash.cc
@@ -0,0 +1,86 @@
+/* benchmark_slidehash.cc -- benchmark slide_hash variants
+ * Copyright (C) 2022 Adam Stylinski, Nathan Moinvaziri
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#include <limits.h>
+
+#include <benchmark/benchmark.h>
+
+extern "C" {
+#  include "zbuild.h"
+#  include "zutil_p.h"
+#  include "deflate.h"
+#  include "cpu_features.h"
+}
+
+#define MAX_RANDOM_INTS 32768
+
+class slide_hash: public benchmark::Fixture {
+private:
+    uint16_t *l0;
+    uint16_t *l1;
+    deflate_state *s_g;
+
+public:
+    void SetUp(const ::benchmark::State& state) {
+        l0 = (uint16_t *)zng_alloc(HASH_SIZE * sizeof(uint16_t));
+
+        for (int32_t i = 0; i < HASH_SIZE; i++) {
+            l0[i] = rand();
+        }
+
+        l1 = (uint16_t *)zng_alloc(MAX_RANDOM_INTS * sizeof(uint16_t));
+
+        for (int32_t i = 0; i < MAX_RANDOM_INTS; i++) {
+            l1[i] = rand();
+        }
+
+        deflate_state *s = (deflate_state*)malloc(sizeof(deflate_state));
+        s->head = l0;
+        s->prev = l1;
+        s_g = s;
+    }
+
+    void Bench(benchmark::State& state, slide_hash_func slide_hash) {
+        s_g->w_size = (uint32_t)state.range(0);
+
+        for (auto _ : state) {
+            slide_hash(s_g);
+            benchmark::DoNotOptimize(s_g);
+        }
+    }
+
+    void TearDown(const ::benchmark::State& state) {
+        zng_free(l0);
+        zng_free(l1);
+    }
+};
+
+#define BENCHMARK_SLIDEHASH(name, fptr, support_flag) \
+    BENCHMARK_DEFINE_F(slide_hash, name)(benchmark::State& state) { \
+        if (!support_flag) { \
+            state.SkipWithError("CPU does not support " #name); \
+        } \
+        Bench(state, fptr); \
+    } \
+    BENCHMARK_REGISTER_F(slide_hash, name)->RangeMultiplier(2)->Range(1024, MAX_RANDOM_INTS);
+
+BENCHMARK_SLIDEHASH(c, slide_hash_c, 1);
+
+#ifdef ARM_NEON_SLIDEHASH
+BENCHMARK_SLIDEHASH(neon, slide_hash_neon, arm_cpu_has_neon);
+#endif
+#ifdef POWER8_VSX_SLIDEHASH
+BENCHMARK_SLIDEHASH(power8, slide_hash_power8, power_cpu_has_arch_2_07);
+#endif
+#ifdef PPC_VMX_SLIDEHASH
+BENCHMARK_SLIDEHASH(vmx, slide_hash_vmx, power_cpu_has_altivec);
+#endif
+
+#ifdef X86_SSE2
+BENCHMARK_SLIDEHASH(sse2, slide_hash_sse2, x86_cpu_has_sse2);
+#endif
+#ifdef X86_AVX2
+BENCHMARK_SLIDEHASH(avx2, slide_hash_avx2, x86_cpu_has_avx2);
+#endif