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-rw-r--r--absl/container/inlined_vector.h14
-rw-r--r--absl/strings/BUILD.bazel12
-rw-r--r--absl/strings/ascii_benchmark.cc120
3 files changed, 141 insertions, 5 deletions
diff --git a/absl/container/inlined_vector.h b/absl/container/inlined_vector.h
index 75d98027..ca36fd36 100644
--- a/absl/container/inlined_vector.h
+++ b/absl/container/inlined_vector.h
@@ -626,14 +626,18 @@ class InlinedVector {
// It holds whether the vector is allocated or not in the lowest bit.
// The size is held in the high bits:
// size_ = (size << 1) | is_allocated;
+ //
+ // Maintainer's Note: size_type is user defined. The contract is limited to
+ // arithmetic operators to avoid depending on compliant overloaded bitwise
+ // operators.
class Tag {
public:
Tag() : size_(0) {}
- size_type size() const { return size_ >> 1; }
- void add_size(size_type n) { size_ += n << 1; }
- void set_inline_size(size_type n) { size_ = n << 1; }
- void set_allocated_size(size_type n) { size_ = (n << 1) | 1; }
- bool allocated() const { return size_ & 1; }
+ size_type size() const { return size_ / 2; }
+ void add_size(size_type n) { size_ += n * 2; }
+ void set_inline_size(size_type n) { size_ = n * 2; }
+ void set_allocated_size(size_type n) { size_ = (n * 2) + 1; }
+ bool allocated() const { return size_ % 2; }
private:
size_type size_;
diff --git a/absl/strings/BUILD.bazel b/absl/strings/BUILD.bazel
index 3b1e0675..3a5f1332 100644
--- a/absl/strings/BUILD.bazel
+++ b/absl/strings/BUILD.bazel
@@ -159,6 +159,18 @@ cc_test(
)
cc_test(
+ name = "ascii_benchmark",
+ srcs = ["ascii_benchmark.cc"],
+ copts = ABSL_TEST_COPTS,
+ tags = ["benchmark"],
+ visibility = ["//visibility:private"],
+ deps = [
+ ":strings",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
+
+cc_test(
name = "memutil_benchmark",
srcs = [
"internal/memutil.h",
diff --git a/absl/strings/ascii_benchmark.cc b/absl/strings/ascii_benchmark.cc
new file mode 100644
index 00000000..8dea4b8c
--- /dev/null
+++ b/absl/strings/ascii_benchmark.cc
@@ -0,0 +1,120 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/ascii.h"
+
+#include <cctype>
+#include <string>
+#include <array>
+#include <random>
+
+#include "benchmark/benchmark.h"
+
+namespace {
+
+std::array<unsigned char, 256> MakeShuffledBytes() {
+ std::array<unsigned char, 256> bytes;
+ for (size_t i = 0; i < 256; ++i) bytes[i] = static_cast<unsigned char>(i);
+ std::random_device rd;
+ std::seed_seq seed({rd(), rd(), rd(), rd(), rd(), rd(), rd(), rd()});
+ std::mt19937 g(seed);
+ std::shuffle(bytes.begin(), bytes.end(), g);
+ return bytes;
+}
+
+template <typename Function>
+void AsciiBenchmark(benchmark::State& state, Function f) {
+ std::array<unsigned char, 256> bytes = MakeShuffledBytes();
+ size_t sum = 0;
+ for (auto _ : state) {
+ for (unsigned char b : bytes) sum += f(b) ? 1 : 0;
+ }
+ // Make a copy of `sum` before calling `DoNotOptimize` to make sure that `sum`
+ // can be put in a CPU register and not degrade performance in the loop above.
+ size_t sum2 = sum;
+ benchmark::DoNotOptimize(sum2);
+ state.SetBytesProcessed(state.iterations() * bytes.size());
+}
+
+using StdAsciiFunction = int (*)(int);
+template <StdAsciiFunction f>
+void BM_Ascii(benchmark::State& state) {
+ AsciiBenchmark(state, f);
+}
+
+using AbslAsciiIsFunction = bool (*)(unsigned char);
+template <AbslAsciiIsFunction f>
+void BM_Ascii(benchmark::State& state) {
+ AsciiBenchmark(state, f);
+}
+
+using AbslAsciiToFunction = char (*)(unsigned char);
+template <AbslAsciiToFunction f>
+void BM_Ascii(benchmark::State& state) {
+ AsciiBenchmark(state, f);
+}
+
+inline char Noop(unsigned char b) { return static_cast<char>(b); }
+
+BENCHMARK_TEMPLATE(BM_Ascii, Noop);
+BENCHMARK_TEMPLATE(BM_Ascii, std::isalpha);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isalpha);
+BENCHMARK_TEMPLATE(BM_Ascii, std::isdigit);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isdigit);
+BENCHMARK_TEMPLATE(BM_Ascii, std::isalnum);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isalnum);
+BENCHMARK_TEMPLATE(BM_Ascii, std::isspace);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isspace);
+BENCHMARK_TEMPLATE(BM_Ascii, std::ispunct);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_ispunct);
+BENCHMARK_TEMPLATE(BM_Ascii, std::isblank);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isblank);
+BENCHMARK_TEMPLATE(BM_Ascii, std::iscntrl);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_iscntrl);
+BENCHMARK_TEMPLATE(BM_Ascii, std::isxdigit);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isxdigit);
+BENCHMARK_TEMPLATE(BM_Ascii, std::isprint);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isprint);
+BENCHMARK_TEMPLATE(BM_Ascii, std::isgraph);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isgraph);
+BENCHMARK_TEMPLATE(BM_Ascii, std::isupper);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isupper);
+BENCHMARK_TEMPLATE(BM_Ascii, std::islower);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_islower);
+BENCHMARK_TEMPLATE(BM_Ascii, isascii);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_isascii);
+BENCHMARK_TEMPLATE(BM_Ascii, std::tolower);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_tolower);
+BENCHMARK_TEMPLATE(BM_Ascii, std::toupper);
+BENCHMARK_TEMPLATE(BM_Ascii, absl::ascii_toupper);
+
+static void BM_StrToLower(benchmark::State& state) {
+ const int size = state.range(0);
+ std::string s(size, 'X');
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(absl::AsciiStrToLower(s));
+ }
+}
+BENCHMARK(BM_StrToLower)->Range(1, 1 << 20);
+
+static void BM_StrToUpper(benchmark::State& state) {
+ const int size = state.range(0);
+ std::string s(size, 'x');
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(absl::AsciiStrToUpper(s));
+ }
+}
+BENCHMARK(BM_StrToUpper)->Range(1, 1 << 20);
+
+} // namespace