src/test/codegen/loads.rs

// Copyright 2015 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: -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
}