| // Copyright 2018 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| // |
| // compile-flags: -Ccodegen-units=1 -O |
| |
| fn linidx(row: usize, col: usize) -> usize { |
| row * 1 + col * 3 |
| } |
| |
| fn main() { |
| let mut mat = [1.0f32, 5.0, 9.0, 2.0, 6.0, 10.0, 3.0, 7.0, 11.0, 4.0, 8.0, 12.0]; |
| |
| for i in 0..2 { |
| for j in i+1..3 { |
| if mat[linidx(j, 3)] > mat[linidx(i, 3)] { |
| for k in 0..4 { |
| let (x, rest) = mat.split_at_mut(linidx(i, k) + 1); |
| let a = x.last_mut().unwrap(); |
| let b = rest.get_mut(linidx(j, k) - linidx(i, k) - 1).unwrap(); |
| ::std::mem::swap(a, b); |
| } |
| } |
| } |
| } |
| assert_eq!([9.0, 5.0, 1.0, 10.0, 6.0, 2.0, 11.0, 7.0, 3.0, 12.0, 8.0, 4.0], mat); |
| } |
