[libcxx-commits] [libcxx] [libc++] Fold __search_substring into _Traits::find in case the second string has length 1 (PR #160076)

[Louis Dionne via libcxx-commits]

================
@@ -60,6 +60,45 @@ static void BM_StringFindMatch2(benchmark::State& state) {
 }
 BENCHMARK(BM_StringFindMatch2)->Range(1, MAX_STRING_LEN / 4);
 
+static void BM_string_literal(benchmark::State& state) {
+  std::string s;
+
+  for (int i = 0; i < state.range(0); i++)
+    s += 'a';
+
+  s += 'b';
+
+  benchmark::DoNotOptimize(s.data());
+  benchmark::ClobberMemory();
+  size_t pos;
+
+  for (auto _ : state) {
+    benchmark::DoNotOptimize(pos = s.find("b")); // "b" is a string literal, it should be longer
+    benchmark::ClobberMemory();
+  }
+}
+
+BENCHMARK(BM_string_literal)->RangeMultiplier(2)->Range(8, 8 << 10);
+
+static void BM_char_literal(benchmark::State& state) {
----------------
ldionne wrote:

```suggestion
static void BM_StringFindCharLiteral(benchmark::State& state) {
```

https://github.com/llvm/llvm-project/pull/160076