rust/src/test/codegen/consts.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"]
#![feature(rustc_attrs)]

// Below, these constants are defined as enum variants that by itself would
// have a lower alignment than the enum type. Ensure that we mark them
// correctly with the higher alignment of the enum.

// CHECK: @STATIC = {{.*}}, align 4

// This checks the constants from inline_enum_const
// CHECK: @const{{[0-9]+}} = {{.*}}, align 2

// This checks the constants from {low,high}_align_const, they share the same
// constant, but the alignment differs, so the higher one should be used
// CHECK: @const{{[0-9]+}} = {{.*}}, align 4

#[derive(Copy, Clone)]

// repr(i16) is required for the {low,high}_align_const test
#[repr(i16)]
pub enum E<A, B> {
    A(A),
    B(B),
}

#[no_mangle]
pub static STATIC: E<i16, i32> = E::A(0);

// CHECK-LABEL: @static_enum_const
#[no_mangle]
#[rustc_no_mir] // FIXME #27840 MIR has different codegen.
pub fn static_enum_const() -> E<i16, i32> {
   STATIC
}

// CHECK-LABEL: @inline_enum_const
#[no_mangle]
#[rustc_no_mir] // FIXME #27840 MIR has different codegen.
pub fn inline_enum_const() -> E<i8, i16> {
    E::A(0)
}

// CHECK-LABEL: @low_align_const
#[no_mangle]
#[rustc_no_mir] // FIXME #27840 MIR has different codegen.
pub fn low_align_const() -> E<i16, [i16; 3]> {
// Check that low_align_const and high_align_const use the same constant
// CHECK: call void @llvm.memcpy.{{.*}}(i8* %{{[0-9]+}}, i8* {{.*}} [[LOW_HIGH:@const[0-9]+]]
    E::A(0)
}

// CHECK-LABEL: @high_align_const
#[no_mangle]
#[rustc_no_mir] // FIXME #27840 MIR has different codegen.
pub fn high_align_const() -> E<i16, i32> {
// Check that low_align_const and high_align_const use the same constant
// CHECK: call void @llvm.memcpy.{{.*}}(i8* %{{[0-9]}}, i8* {{.*}} [[LOW_HIGH]]
    E::A(0)
}