diff options
Diffstat (limited to 'src/grid.rs')
| -rw-r--r-- | src/grid.rs | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/src/grid.rs b/src/grid.rs index 8dbfd0b5..7acfeaa3 100644 --- a/src/grid.rs +++ b/src/grid.rs @@ -145,17 +145,19 @@ impl<T> Grid<T> { /// better error messages by doing the bounds checking ourselves. #[inline] pub fn swap_lines(&mut self, src: index::Line, dst: index::Line) { - // check that src/dst are in bounds. Since index::Line newtypes usize, - // we can assume values are positive. - if src >= self.lines { - panic!("swap_lines src out of bounds; len={}, src={}", self.raw.len(), src); - } - - if dst >= self.lines { - panic!("swap_lines dst out of bounds; len={}, dst={}", self.raw.len(), dst); - } + use std::intrinsics::unlikely; unsafe { + // check that src/dst are in bounds. Since index::Line newtypes usize, + // we can assume values are positive. + if unlikely(src >= self.lines) { + panic!("swap_lines src out of bounds; len={}, src={}", self.raw.len(), src); + } + + if unlikely(dst >= self.lines) { + panic!("swap_lines dst out of bounds; len={}, dst={}", self.raw.len(), dst); + } + let src: *mut _ = self.raw.get_unchecked_mut(src.0); let dst: *mut _ = self.raw.get_unchecked_mut(dst.0); |