tests/codegen/slice-position-bounds-check.rs

   1 // no-system-llvm
   2 // compile-flags: -O -C panic=abort
   3 #![crate_type = "lib"]
   4
   5 fn search<T: Ord + Eq>(arr: &mut [T], a: &T) -> Result<usize, ()> {
   6     match arr.iter().position(|x| x == a) {
   7         Some(p) => {
   8             Ok(p)
   9         },
  10         None => Err(()),
  11     }
  12 }
  13
  14 // CHECK-LABEL: @position_no_bounds_check
  15 #[no_mangle]
  16 pub fn position_no_bounds_check(y: &mut [u32], x: &u32, z: &u32) -> bool {
  17     // This contains "call assume" so we cannot just rule out all calls
  18     // CHECK-NOT: panic_bounds_check
  19     if let Ok(p) = search(y, x) {
  20       y[p] == *z
  21     } else {
  22       false
  23     }
  24 }
  25
  26 // just to make sure that panicking really emits "panic_bounds_check" somewhere in the IR
  27 // CHECK-LABEL: @test_check
  28 #[no_mangle]
  29 pub fn test_check(y: &[i32]) -> i32 {
  30     // CHECK: panic_bounds_check
  31     y[12]
  32 }