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54a0048b | 1 | // Copyright 2016 The Rust Project Developers. See the COPYRIGHT |
223e47cc LB |
2 | // file at the top-level directory of this distribution and at |
3 | // http://rust-lang.org/COPYRIGHT. | |
4 | // | |
5 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
6 | // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
7 | // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | |
8 | // option. This file may not be copied, modified, or distributed | |
9 | // except according to those terms. | |
10 | ||
32a655c1 | 11 | // compile-flags: -C no-prepopulate-passes |
9e0c209e | 12 | |
32a655c1 | 13 | #![crate_type = "lib"] |
c30ab7b3 | 14 | |
32a655c1 SL |
15 | #[repr(packed)] |
16 | pub struct Packed { | |
17 | dealign: u8, | |
18 | data: u32 | |
c30ab7b3 | 19 | } |
223e47cc | 20 | |
32a655c1 SL |
21 | // CHECK-LABEL: @write_pkd |
22 | #[no_mangle] | |
23 | pub fn write_pkd(pkd: &mut Packed) -> u32 { | |
24 | // CHECK: %{{.*}} = load i32, i32* %{{.*}}, align 1 | |
25 | // CHECK: store i32 42, i32* %{{.*}}, align 1 | |
26 | let result = pkd.data; | |
27 | pkd.data = 42; | |
28 | result | |
223e47cc | 29 | } |
8bb4bdeb XL |
30 | |
31 | pub struct Array([i32; 8]); | |
32 | #[repr(packed)] | |
33 | pub struct BigPacked { | |
34 | dealign: u8, | |
35 | data: Array | |
36 | } | |
37 | ||
38 | // CHECK-LABEL: @call_pkd | |
39 | #[no_mangle] | |
40 | pub fn call_pkd(f: fn() -> Array) -> BigPacked { | |
41 | // CHECK: [[ALLOCA:%[_a-z0-9]+]] = alloca %Array | |
42 | // CHECK: call void %{{.*}}(%Array* noalias nocapture sret dereferenceable(32) [[ALLOCA]]) | |
43 | // CHECK: call void @llvm.memcpy.{{.*}}(i8* %{{.*}}, i8* %{{.*}}, i{{[0-9]+}} 32, i32 1, i1 false) | |
44 | // check that calls whose destination is a field of a packed struct | |
45 | // go through an alloca rather than calling the function with an | |
46 | // unaligned destination. | |
47 | BigPacked { dealign: 0, data: f() } | |
48 | } | |
49 | ||
50 | #[repr(packed)] | |
51 | #[derive(Copy, Clone)] | |
52 | pub struct PackedPair(u8, u32); | |
53 | ||
54 | // CHECK-LABEL: @pkd_pair | |
55 | #[no_mangle] | |
56 | pub fn pkd_pair(pair1: &mut PackedPair, pair2: &mut PackedPair) { | |
57 | // CHECK: [[V1:%[a-z0-9]+]] = load i8, i8* %{{.*}}, align 1 | |
58 | // CHECK: [[V2:%[a-z0-9]+]] = load i32, i32* %{{.*}}, align 1 | |
59 | // CHECK: store i8 [[V1]], i8* {{.*}}, align 1 | |
60 | // CHECK: store i32 [[V2]], i32* {{.*}}, align 1 | |
61 | *pair2 = *pair1; | |
62 | } | |
abe05a73 XL |
63 | |
64 | #[repr(packed)] | |
65 | #[derive(Copy, Clone)] | |
66 | pub struct PackedNestedPair((u32, u32)); | |
67 | ||
68 | // CHECK-LABEL: @pkd_nested_pair | |
69 | #[no_mangle] | |
70 | pub fn pkd_nested_pair(pair1: &mut PackedNestedPair, pair2: &mut PackedNestedPair) { | |
71 | // CHECK: call void @llvm.memcpy.{{.*}}(i8* %{{.*}}, i8* %{{.*}}, i{{[0-9]+}} 8, i32 1, i1 false) | |
72 | *pair2 = *pair1; | |
73 | } |