src/test/codegen/loads.rs

// compile-flags: -C no-prepopulate-passes

#![crate_type = "lib"]

pub struct Bytes {
  a: u8,
  b: u8,
  c: u8,
  d: u8,
}

// CHECK-LABEL: @borrow
#[no_mangle]
pub fn borrow(x: &i32) -> &i32 {
// CHECK: load {{(i32\*, )?}}i32** %x{{.*}}, !nonnull
    &x; // keep variable in an alloca
    x
}

// CHECK-LABEL: @_box
#[no_mangle]
pub fn _box(x: Box<i32>) -> i32 {
// CHECK: load {{(i32\*, )?}}i32** %x{{.*}}, !nonnull
    *x
}

// CHECK-LABEL: small_array_alignment
// The array is loaded as i32, but its alignment is lower, go with 1 byte to avoid target
// dependent alignment
#[no_mangle]
pub fn small_array_alignment(x: [i8; 4]) -> [i8; 4] {
// CHECK: [[VAR:%[0-9]+]] = load {{(i32, )?}}i32* %{{.*}}, align 1
// CHECK: ret i32 [[VAR]]
    x
}

// CHECK-LABEL: small_struct_alignment
// The struct is loaded as i32, but its alignment is lower, go with 1 byte to avoid target
// dependent alignment
#[no_mangle]
pub fn small_struct_alignment(x: Bytes) -> Bytes {
// CHECK: [[VAR:%[0-9]+]] = load {{(i32, )?}}i32* %{{.*}}, align 1
// CHECK: ret i32 [[VAR]]
    x
}