commit b658af2a1681eb8a74ced2932ff506438309f9be
author Eric Fiselier <eric@efcs.ca> Sun Jul 24 06:22:25 2016 +0000
committer Eric Fiselier <eric@efcs.ca> Sun Jul 24 06:22:25 2016 +0000
tree 7007a2b454ccc4f899dd4fab67f31a872f153ab3
parent 07bb8de02d8edb04de54cff6136cf8c81c1ffb02

Skip chash computation in insert/emplace if the unconstrained hash matches.

llvm-svn: 276549
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 1a06fe5f7ea47112a5e8ac6e0cc471ef96759591

benchmarks/ContainerBenchmarks.hpp

diff --git a/benchmarks/ContainerBenchmarks.hpp b/benchmarks/ContainerBenchmarks.hpp
index d6107f6..8321caf 100644
--- a/benchmarks/ContainerBenchmarks.hpp
+++ b/benchmarks/ContainerBenchmarks.hpp
@@ -34,6 +34,38 @@
     }
 }
 
+
+template <class Container, class GenInputs>
+void BM_InsertDuplicate(benchmark::State& st, Container c, GenInputs gen) {
+    auto in = gen(st.range_x());
+    const auto end = in.end();
+    c.insert(in.begin(), in.end());
+    benchmark::DoNotOptimize(&c);
+    benchmark::DoNotOptimize(&in);
+    while (st.KeepRunning()) {
+        for (auto it = in.begin(); it != end; ++it) {
+            benchmark::DoNotOptimize(&(*c.insert(*it).first));
+        }
+        benchmark::ClobberMemory();
+    }
+}
+
+
+template <class Container, class GenInputs>
+void BM_EmplaceDuplicate(benchmark::State& st, Container c, GenInputs gen) {
+    auto in = gen(st.range_x());
+    const auto end = in.end();
+    c.insert(in.begin(), in.end());
+    benchmark::DoNotOptimize(&c);
+    benchmark::DoNotOptimize(&in);
+    while (st.KeepRunning()) {
+        for (auto it = in.begin(); it != end; ++it) {
+            benchmark::DoNotOptimize(&(*c.emplace(*it).first));
+        }
+        benchmark::ClobberMemory();
+    }
+}
+
 template <class Container, class GenInputs>
 static void BM_Find(benchmark::State& st, Container c, GenInputs gen) {
     auto in = gen(st.range_x());

benchmarks/GenerateInput.hpp

diff --git a/benchmarks/GenerateInput.hpp b/benchmarks/GenerateInput.hpp
index 5ddda76..49fb48d 100644
--- a/benchmarks/GenerateInput.hpp
+++ b/benchmarks/GenerateInput.hpp
@@ -130,4 +130,11 @@
     return inputs;
 }
 
+inline std::vector<const char*> getRandomCStringInputs(size_t N) {
+    static std::vector<std::string> inputs = getRandomStringInputs(N);
+    std::vector<const char*> cinputs;
+    for (auto const& str : inputs)
+        cinputs.push_back(str.c_str());
+    return cinputs;
+}
 #endif // BENCHMARK_GENERATE_INPUT_HPP

benchmarks/unordered_set_operations.bench.cpp

diff --git a/benchmarks/unordered_set_operations.bench.cpp b/benchmarks/unordered_set_operations.bench.cpp
index ab737c1..8c44638 100644
--- a/benchmarks/unordered_set_operations.bench.cpp
+++ b/benchmarks/unordered_set_operations.bench.cpp
@@ -265,4 +265,42 @@
     std::unordered_set<std::string>{},
     getRandomStringInputs)->Arg(TestNumInputs);
 
+///////////////////////////////////////////////////////////////////////////////
+BENCHMARK_CAPTURE(BM_InsertDuplicate,
+    unordered_set_int,
+    std::unordered_set<int>{},
+    getRandomIntegerInputs<int>)->Arg(TestNumInputs);
+BENCHMARK_CAPTURE(BM_InsertDuplicate,
+    unordered_set_string,
+    std::unordered_set<std::string>{},
+    getRandomStringInputs)->Arg(TestNumInputs);
+
+BENCHMARK_CAPTURE(BM_EmplaceDuplicate,
+    unordered_set_int,
+    std::unordered_set<int>{},
+    getRandomIntegerInputs<int>)->Arg(TestNumInputs);
+BENCHMARK_CAPTURE(BM_EmplaceDuplicate,
+    unordered_set_string,
+    std::unordered_set<std::string>{},
+    getRandomStringInputs)->Arg(TestNumInputs);
+
+BENCHMARK_CAPTURE(BM_InsertDuplicate,
+    unordered_set_int_insert_arg,
+    std::unordered_set<int>{},
+    getRandomIntegerInputs<int>)->Arg(TestNumInputs);
+BENCHMARK_CAPTURE(BM_InsertDuplicate,
+    unordered_set_string_insert_arg,
+    std::unordered_set<std::string>{},
+    getRandomStringInputs)->Arg(TestNumInputs);
+
+BENCHMARK_CAPTURE(BM_EmplaceDuplicate,
+    unordered_set_int_insert_arg,
+    std::unordered_set<int>{},
+    getRandomIntegerInputs<unsigned>)->Arg(TestNumInputs);
+
+BENCHMARK_CAPTURE(BM_EmplaceDuplicate,
+    unordered_set_string_arg,
+    std::unordered_set<std::string>{},
+    getRandomCStringInputs)->Arg(TestNumInputs);
+
 BENCHMARK_MAIN()