mirror of https://github.com/rust-lang/rust
154 lines
4.2 KiB
Rust
154 lines
4.2 KiB
Rust
//
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//@ compile-flags: -O -C no-prepopulate-passes
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#![crate_type = "lib"]
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#[repr(packed)]
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pub struct Packed1 {
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dealign: u8,
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data: u32
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}
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#[repr(packed(2))]
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pub struct Packed2 {
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dealign: u8,
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data: u32
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}
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// CHECK-LABEL: @write_pkd1
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#[no_mangle]
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pub fn write_pkd1(pkd: &mut Packed1) -> u32 {
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// CHECK: %{{.*}} = load i32, ptr %{{.*}}, align 1
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// CHECK: store i32 42, ptr %{{.*}}, align 1
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let result = pkd.data;
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pkd.data = 42;
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result
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}
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// CHECK-LABEL: @write_pkd2
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#[no_mangle]
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pub fn write_pkd2(pkd: &mut Packed2) -> u32 {
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// CHECK: %{{.*}} = load i32, ptr %{{.*}}, align 2
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// CHECK: store i32 42, ptr %{{.*}}, align 2
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let result = pkd.data;
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pkd.data = 42;
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result
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}
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pub struct Array([i32; 8]);
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#[repr(packed)]
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pub struct BigPacked1 {
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dealign: u8,
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data: Array
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}
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#[repr(packed(2))]
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pub struct BigPacked2 {
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dealign: u8,
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data: Array
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}
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// CHECK-LABEL: @call_pkd1
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#[no_mangle]
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pub fn call_pkd1(f: fn() -> Array) -> BigPacked1 {
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// CHECK: [[ALLOCA:%[_a-z0-9]+]] = alloca [32 x i8]
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// CHECK: call void %{{.*}}(ptr noalias nocapture noundef sret{{.*}} dereferenceable(32) [[ALLOCA]])
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// CHECK: call void @llvm.memcpy.{{.*}}(ptr align 1 %{{.*}}, ptr align 4 %{{.*}}, i{{[0-9]+}} 32, i1 false)
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// check that calls whose destination is a field of a packed struct
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// go through an alloca rather than calling the function with an
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// unaligned destination.
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BigPacked1 { dealign: 0, data: f() }
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}
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// CHECK-LABEL: @call_pkd2
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#[no_mangle]
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pub fn call_pkd2(f: fn() -> Array) -> BigPacked2 {
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// CHECK: [[ALLOCA:%[_a-z0-9]+]] = alloca [32 x i8]
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// CHECK: call void %{{.*}}(ptr noalias nocapture noundef sret{{.*}} dereferenceable(32) [[ALLOCA]])
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// CHECK: call void @llvm.memcpy.{{.*}}(ptr align 2 %{{.*}}, ptr align 4 %{{.*}}, i{{[0-9]+}} 32, i1 false)
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// check that calls whose destination is a field of a packed struct
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// go through an alloca rather than calling the function with an
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// unaligned destination.
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BigPacked2 { dealign: 0, data: f() }
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}
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// CHECK-LABEL: @write_packed_array1
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// CHECK: store i32 0, ptr %{{.+}}, align 1
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// CHECK: store i32 1, ptr %{{.+}}, align 1
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// CHECK: store i32 2, ptr %{{.+}}, align 1
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#[no_mangle]
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pub fn write_packed_array1(p: &mut BigPacked1) {
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p.data.0[0] = 0;
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p.data.0[1] = 1;
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p.data.0[2] = 2;
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}
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// CHECK-LABEL: @write_packed_array2
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// CHECK: store i32 0, ptr %{{.+}}, align 2
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// CHECK: store i32 1, ptr %{{.+}}, align 2
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// CHECK: store i32 2, ptr %{{.+}}, align 2
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#[no_mangle]
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pub fn write_packed_array2(p: &mut BigPacked2) {
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p.data.0[0] = 0;
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p.data.0[1] = 1;
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p.data.0[2] = 2;
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}
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// CHECK-LABEL: @repeat_packed_array1
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// CHECK: store i32 42, ptr %{{.+}}, align 1
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#[no_mangle]
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pub fn repeat_packed_array1(p: &mut BigPacked1) {
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p.data.0 = [42; 8];
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}
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// CHECK-LABEL: @repeat_packed_array2
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// CHECK: store i32 42, ptr %{{.+}}, align 2
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#[no_mangle]
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pub fn repeat_packed_array2(p: &mut BigPacked2) {
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p.data.0 = [42; 8];
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}
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#[repr(packed)]
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#[derive(Copy, Clone)]
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pub struct Packed1Pair(u8, u32);
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#[repr(packed(2))]
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#[derive(Copy, Clone)]
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pub struct Packed2Pair(u8, u32);
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// CHECK-LABEL: @pkd1_pair
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#[no_mangle]
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pub fn pkd1_pair(pair1: &mut Packed1Pair, pair2: &mut Packed1Pair) {
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// CHECK: call void @llvm.memcpy.{{.*}}(ptr align 1 %{{.*}}, ptr align 1 %{{.*}}, i{{[0-9]+}} 5, i1 false)
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*pair2 = *pair1;
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}
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// CHECK-LABEL: @pkd2_pair
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#[no_mangle]
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pub fn pkd2_pair(pair1: &mut Packed2Pair, pair2: &mut Packed2Pair) {
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// CHECK: call void @llvm.memcpy.{{.*}}(ptr align 2 %{{.*}}, ptr align 2 %{{.*}}, i{{[0-9]+}} 6, i1 false)
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*pair2 = *pair1;
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}
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#[repr(packed)]
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#[derive(Copy, Clone)]
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pub struct Packed1NestedPair((u32, u32));
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#[repr(packed(2))]
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#[derive(Copy, Clone)]
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pub struct Packed2NestedPair((u32, u32));
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// CHECK-LABEL: @pkd1_nested_pair
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#[no_mangle]
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pub fn pkd1_nested_pair(pair1: &mut Packed1NestedPair, pair2: &mut Packed1NestedPair) {
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// CHECK: call void @llvm.memcpy.{{.*}}(ptr align 1 %{{.*}}, ptr align 1 %{{.*}}, i{{[0-9]+}} 8, i1 false)
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*pair2 = *pair1;
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}
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// CHECK-LABEL: @pkd2_nested_pair
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#[no_mangle]
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pub fn pkd2_nested_pair(pair1: &mut Packed2NestedPair, pair2: &mut Packed2NestedPair) {
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// CHECK: call void @llvm.memcpy.{{.*}}(ptr align 2 %{{.*}}, ptr align 2 %{{.*}}, i{{[0-9]+}} 8, i1 false)
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*pair2 = *pair1;
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}
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