bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

nano-optimization for memchr::repeat_byte

Browse source
This commit is contained in:
Andre Bogus 2018-05-02 23:53:40 +02:00
parent 3eadd75473
commit 1cefb5ce31
1 changed files with 2 additions and 13 deletions
Download patch file Download diff file Expand all files Collapse all files

15
src/libcore/slice/memchr.rs
View file

@ -39,21 +39,10 @@ fn repeat_byte(b: u8) -> usize {
(b as usize) << 8 | b as usize
}
#[cfg(target_pointer_width = "32")]
#[cfg(not(target_pointer_width = "16"))]
#[inline]
fn repeat_byte(b: u8) -> usize {
let mut rep = (b as usize) << 8 | b as usize;
rep = rep << 16 | rep;
rep
}
#[cfg(target_pointer_width = "64")]
#[inline]
fn repeat_byte(b: u8) -> usize {
let mut rep = (b as usize) << 8 | b as usize;
rep = rep << 16 | rep;
rep = rep << 32 | rep;
rep
(b as usize) * (::usize::MAX / 255)
}
/// Return the first index matching the byte `x` in `text`.