summaryrefslogtreecommitdiff
path: root/absl/strings/ascii_benchmark.cc
diff options
context:
space:
mode:
authorGravatar Abseil Team <absl-team@google.com>2018-07-19 11:45:32 -0700
committerGravatar Ashley Hedberg <ahedberg@google.com>2018-07-20 09:18:23 -0400
commit7aa411ceafc1272a28579cca739a97a2fb79055a (patch)
tree84f14f1a41d294a4e24428b413676ddbf3c62ab9 /absl/strings/ascii_benchmark.cc
parent2c5af55ed34850d8b7dd46177c8ca53fdfda920e (diff)
Export of internal Abseil changes.
-- 298d93fcb860116111611a8ab0662b409734227a by Alex Strelnikov <strel@google.com>: Release ascii_benchmark. PiperOrigin-RevId: 205275981 -- 73a01469e5862eefbe5ef9d434f45b7073476272 by Abseil Team <absl-team@google.com>: Internal cleanup PiperOrigin-RevId: 205236717 -- 53d6338bf49dab95bd0fbb5bbcd56970c6b868c2 by Abseil Team <absl-team@google.com>: Removes InlinedVector's dependency on bitwise operators for size_type PiperOrigin-RevId: 205236134 GitOrigin-RevId: 298d93fcb860116111611a8ab0662b409734227a Change-Id: I754f5eea889567add2dbbdea358a533f54a912dd
Diffstat (limited to 'absl/strings/ascii_benchmark.cc')
-rw-r--r--absl/strings/ascii_benchmark.cc120
1 files changed, 120 insertions, 0 deletions
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