Make use of `unlikely` intrinsic
There's some bounds checks we do that panic if the condition is ever true.
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20
src/grid.rs
20
src/grid.rs
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@ -145,17 +145,19 @@ impl<T> Grid<T> {
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/// better error messages by doing the bounds checking ourselves.
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#[inline]
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pub fn swap_lines(&mut self, src: index::Line, dst: index::Line) {
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// check that src/dst are in bounds. Since index::Line newtypes usize,
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// we can assume values are positive.
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if src >= self.lines {
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panic!("swap_lines src out of bounds; len={}, src={}", self.raw.len(), src);
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}
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if dst >= self.lines {
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panic!("swap_lines dst out of bounds; len={}, dst={}", self.raw.len(), dst);
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}
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use std::intrinsics::unlikely;
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unsafe {
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// check that src/dst are in bounds. Since index::Line newtypes usize,
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// we can assume values are positive.
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if unlikely(src >= self.lines) {
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panic!("swap_lines src out of bounds; len={}, src={}", self.raw.len(), src);
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}
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if unlikely(dst >= self.lines) {
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panic!("swap_lines dst out of bounds; len={}, dst={}", self.raw.len(), dst);
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}
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let src: *mut _ = self.raw.get_unchecked_mut(src.0);
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let dst: *mut _ = self.raw.get_unchecked_mut(dst.0);
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@ -21,6 +21,7 @@
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#![feature(step_trait)]
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#![feature(custom_derive, plugin)]
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#![plugin(serde_macros)]
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#![feature(core_intrinsics)]
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extern crate cgmath;
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extern crate errno;
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@ -467,8 +467,10 @@ impl ansi::Handler for Term {
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self.cursor.col = Column(0);
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}
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if self.cursor.line == self.grid.num_lines() {
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panic!("cursor fell off grid");
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unsafe {
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if ::std::intrinsics::unlikely(self.cursor.line == self.grid.num_lines()) {
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panic!("cursor fell off grid");
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}
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}
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let cell = &mut self.grid[&self.cursor];
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