rust/src/test/codegen/stores.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

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

// CHECK-LABEL: small_array_alignment
// The array is stored as i32, but its alignment is lower, go with 1 byte to avoid target
// dependent alignment
#[no_mangle]
pub fn small_array_alignment(x: &mut [i8; 4]) {
// CHECK: [[VAR:%[0-9]+]] = load {{(\[4 x i8\]\*, )?}}[4 x i8]** %x
// CHECK: [[VAR2:%[0-9]+]] = bitcast [4 x i8]* [[VAR]] to i32*
// CHECK: store i32 %{{.*}}, i32* [[VAR2]], align 1
    *x = [0; 4];
}

// CHECK-LABEL: small_struct_alignment
// The struct is stored as i32, but its alignment is lower, go with 1 byte to avoid target
// dependent alignment
#[no_mangle]
pub fn small_struct_alignment(x: &mut Bytes) {
// CHECK: [[VAR:%[0-9]+]] = load {{(%Bytes\*, )?}}%Bytes** %x
// CHECK: [[VAR2:%[0-9]+]] = bitcast %Bytes* [[VAR]] to i32*
// CHECK: store i32 %{{.*}}, i32* [[VAR2]], align 1
    *x = Bytes {
        a: 0,
        b: 0,
        c: 0,
        d: 0,
    };
}