src/test/ui/intrinsics/const-eval-select-x86_64.rs

   1 // run-pass
   2 // only-x86_64
   3
   4 #![feature(const_eval_select)]
   5 #![feature(core_intrinsics)]
   6 use std::intrinsics::const_eval_select;
   7 use std::arch::x86_64::*;
   8 use std::mem::transmute;
   9
  10 const fn eq_ct(x: [i32; 4], y: [i32; 4]) -> bool {
  11     x[0] == y[0] && x[1] == y[1] && x[2] == y[2] && x[3] == y[3]
  12 }
  13
  14 fn eq_rt(x: [i32; 4], y: [i32; 4]) -> bool {
  15     unsafe {
  16         let x = _mm_loadu_si128(&x as *const _ as *const _);
  17         let y = _mm_loadu_si128(&y as *const _ as *const _);
  18         let r = _mm_cmpeq_epi32(x, y);
  19         let r = _mm_movemask_ps(transmute(r) );
  20         r == 0b1111
  21     }
  22 }
  23
  24 const fn eq(x: [i32; 4], y: [i32; 4]) -> bool {
  25     unsafe {
  26         const_eval_select((x, y), eq_ct, eq_rt)
  27     }
  28 }
  29
  30 fn main() {
  31     const X: bool = eq([0, 1, 2, 3], [0, 1, 2, 3]);
  32     assert_eq!(X, true);
  33     let x = eq([0, 1, 2, 3], [0, 1, 2, 3]);
  34     assert_eq!(x, true);
  35
  36     const Y: bool = eq([0, 1, 2, 3], [0, 1, 3, 2]);
  37     assert_eq!(Y, false);
  38     let y = eq([0, 1, 2, 3], [0, 1, 3, 2]);
  39     assert_eq!(y, false);
  40 }