diff options
| -rw-r--r-- | src/libcollections/string.rs | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/src/libcollections/string.rs b/src/libcollections/string.rs index 3837dd703be..76f69dbdb74 100644 --- a/src/libcollections/string.rs +++ b/src/libcollections/string.rs @@ -513,6 +513,11 @@ impl String { #[inline] #[stable = "function just renamed from push_char"] pub fn push(&mut self, ch: char) { + if (ch as u32) < 0x80 { + self.vec.push(ch as u8); + return; + } + let cur_len = self.len(); // This may use up to 4 bytes. self.vec.reserve(4); @@ -1401,6 +1406,41 @@ mod tests { }); } + const REPETITIONS: u64 = 10_000; + + #[bench] + fn bench_push_str_one_byte(b: &mut Bencher) { + b.bytes = REPETITIONS; + b.iter(|| { + let mut r = String::new(); + for _ in range(0, REPETITIONS) { + r.push_str("a") + } + }); + } + + #[bench] + fn bench_push_char_one_byte(b: &mut Bencher) { + b.bytes = REPETITIONS; + b.iter(|| { + let mut r = String::new(); + for _ in range(0, REPETITIONS) { + r.push('a') + } + }); + } + + #[bench] + fn bench_push_char_two_bytes(b: &mut Bencher) { + b.bytes = REPETITIONS * 2; + b.iter(|| { + let mut r = String::new(); + for _ in range(0, REPETITIONS) { + r.push('รข') + } + }); + } + #[bench] fn from_utf8_lossy_100_ascii(b: &mut Bencher) { let s = b"Hello there, the quick brown fox jumped over the lazy dog! \ |