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| 1 | +// RUN: %clang_cc1 -triple x86_64-unknown-unknown -std=c2x -verify -emit-llvm %s -o - | FileCheck %s |
| 2 | +// expected-no-diagnostics |
| 3 | + |
| 4 | +struct S { int x, y; }; |
| 5 | +struct T { |
| 6 | + int i; |
| 7 | + struct S s; |
| 8 | +}; |
| 9 | + |
| 10 | +// CHECK: @[[CONST_T1:.+]] = private unnamed_addr constant %struct.T { i32 1, %struct.S zeroinitializer } |
| 11 | +// CHECK: @[[CONST_T2:.+]] = private unnamed_addr constant %struct.T { i32 1, %struct.S { i32 2, i32 0 } } |
| 12 | + |
| 13 | +void test_struct() { |
| 14 | + struct S s = {}; |
| 15 | + // CHECK: define {{.*}} void @test_struct |
| 16 | + // CHECK-NEXT: entry: |
| 17 | + // CHECK-NEXT: %[[S:.+]] = alloca %struct.S |
| 18 | + // CHECK-NEXT: call void @llvm.memset.p0.i64({{.*}}%[[S]], i8 0, i64 8, i1 false) |
| 19 | +} |
| 20 | + |
| 21 | +void test_var() { |
| 22 | + int i = {}; |
| 23 | + // CHECK: define {{.*}} void @test_var |
| 24 | + // CHECK-NEXT: entry: |
| 25 | + // CHECK-NEXT: %[[I:.+]] = alloca i32 |
| 26 | + // CHECK-NEXT: store i32 0, ptr %[[I]] |
| 27 | +} |
| 28 | + |
| 29 | +void test_simple_compound_literal() { |
| 30 | + int j = (int){}; |
| 31 | + // CHECK: define {{.*}} void @test_simple_compound_literal |
| 32 | + // CHECK-NEXT: entry: |
| 33 | + // CHECK-NEXT: %[[J:.+]] = alloca i32 |
| 34 | + // CHECK-NEXT: %[[COMPOUND:.+]] = alloca i32 |
| 35 | + // CHECK-NEXT: store i32 0, ptr %[[COMPOUND]] |
| 36 | + // CHECK-NEXT: %[[MEM:.+]] = load i32, ptr %[[COMPOUND]] |
| 37 | + // CHECK-NEXT: store i32 %[[MEM]], ptr %[[J]] |
| 38 | +} |
| 39 | + |
| 40 | +void test_zero_size_array() { |
| 41 | + int unknown_size[] = {}; |
| 42 | + // CHECK: define {{.*}} void @test_zero_size_array |
| 43 | + // CHECK-NEXT: entry: |
| 44 | + // CHECK-NEXT: %[[UNKNOWN:.+]] = alloca [0 x i32] |
| 45 | +} |
| 46 | + |
| 47 | +void test_vla() { |
| 48 | + int num_elts = 12; |
| 49 | + int vla[num_elts] = {}; |
| 50 | + // CHECK: define {{.*}} void @test_vla |
| 51 | + // CHECK-NEXT: entry: |
| 52 | + // CHECK-NEXT: %[[NUM_ELTS_PTR:.+]] = alloca i32 |
| 53 | + // CHECK: %[[VLA_EXPR:.+]] = alloca i64 |
| 54 | + // CHECK-NEXT: store i32 12, ptr %[[NUM_ELTS_PTR]] |
| 55 | + // CHECK-NEXT: %[[NUM_ELTS:.+]] = load i32, ptr %[[NUM_ELTS_PTR]] |
| 56 | + // CHECK-NEXT: %[[NUM_ELTS_EXT:.+]] = zext i32 %[[NUM_ELTS]] to i64 |
| 57 | + // CHECK: %[[VLA:.+]] = alloca i32, i64 %[[NUM_ELTS_EXT]] |
| 58 | + // CHECK-NEXT: store i64 %[[NUM_ELTS_EXT]], ptr %[[VLA_EXPR]] |
| 59 | + // CHECK-NEXT: %[[BYTES_TO_COPY:.+]] = mul nuw i64 %[[NUM_ELTS_EXT]], 4 |
| 60 | + // CHECK-NEXT: call void @llvm.memset.p0.i64(ptr {{.*}} %[[VLA]], i8 0, i64 %[[BYTES_TO_COPY]], i1 false) |
| 61 | +} |
| 62 | + |
| 63 | +void test_zero_size_vla() { |
| 64 | + int num_elts = 0; |
| 65 | + int vla[num_elts] = {}; |
| 66 | + // CHECK: define {{.*}} void @test_zero_size_vla |
| 67 | + // CHECK-NEXT: entry: |
| 68 | + // CHECK-NEXT: %[[NUM_ELTS_PTR:.+]] = alloca i32 |
| 69 | + // CHECK: %[[VLA_EXPR:.+]] = alloca i64 |
| 70 | + // CHECK-NEXT: store i32 0, ptr %[[NUM_ELTS_PTR]] |
| 71 | + // CHECK-NEXT: %[[NUM_ELTS:.+]] = load i32, ptr %[[NUM_ELTS_PTR]] |
| 72 | + // CHECK-NEXT: %[[NUM_ELTS_EXT:.+]] = zext i32 %[[NUM_ELTS]] to i64 |
| 73 | + // CHECK: %[[VLA:.+]] = alloca i32, i64 %[[NUM_ELTS_EXT]] |
| 74 | + // CHECK-NEXT: store i64 %[[NUM_ELTS_EXT]], ptr %[[VLA_EXPR]] |
| 75 | + // CHECK-NEXT: %[[BYTES_TO_COPY:.+]] = mul nuw i64 %[[NUM_ELTS_EXT]], 4 |
| 76 | + // CHECK-NEXT: call void @llvm.memset.p0.i64(ptr {{.*}} %[[VLA]], i8 0, i64 %[[BYTES_TO_COPY]], i1 false) |
| 77 | +} |
| 78 | + |
| 79 | +void test_compound_literal_vla() { |
| 80 | + int num_elts = 12; |
| 81 | + int *compound_literal_vla = (int[num_elts]){}; |
| 82 | + // CHECK: define {{.*}} void @test_compound_literal_vla |
| 83 | + // CHECK-NEXT: entry: |
| 84 | + // CHECK-NEXT: %[[NUM_ELTS_PTR:.+]] = alloca i32 |
| 85 | + // CHECK-NEXT: %[[COMP_LIT_VLA:.+]] = alloca ptr |
| 86 | + // CHECK-NEXT: %[[COMP_LIT:.+]] = alloca i32 |
| 87 | + // CHECK-NEXT: store i32 12, ptr %[[NUM_ELTS_PTR]] |
| 88 | + // CHECK-NEXT: %[[NUM_ELTS:.+]] = load i32, ptr %[[NUM_ELTS_PTR]] |
| 89 | + // CHECK-NEXT: %[[NUM_ELTS_EXT:.+]] = zext i32 %[[NUM_ELTS]] to i64 |
| 90 | + // CHECK-NEXT: %[[BYTES_TO_COPY:.+]] = mul nuw i64 %[[NUM_ELTS_EXT]], 4 |
| 91 | + // CHECK-NEXT: call void @llvm.memset.p0.i64(ptr {{.*}} %[[COMP_LIT]], i8 0, i64 %[[BYTES_TO_COPY]], i1 false) |
| 92 | + // CHECK-NEXT: store ptr %[[COMP_LIT]], ptr %[[COMP_LIT_VLA]] |
| 93 | +} |
| 94 | + |
| 95 | +void test_nested_structs() { |
| 96 | + struct T t1 = { 1, {} }; |
| 97 | + struct T t2 = { 1, { 2, {} } }; |
| 98 | + struct T t3 = { (int){}, {} }; |
| 99 | + // CHECK: define {{.*}} void @test_nested_structs |
| 100 | + // CHECK-NEXT: entry: |
| 101 | + // CHECK-NEXT: %[[T1:.+]] = alloca %struct.T |
| 102 | + // CHECK-NEXT: %[[T2:.+]] = alloca %struct.T |
| 103 | + // CHECK-NEXT: %[[T3:.+]] = alloca %struct.T |
| 104 | + // CHECK-NEXT: call void @llvm.memcpy.p0.p0.i64(ptr {{.*}} %[[T1]], ptr {{.*}} @[[CONST_T1]], i64 12, i1 false) |
| 105 | + // CHECK-NEXT: call void @llvm.memcpy.p0.p0.i64(ptr {{.*}} %[[T2]], ptr {{.*}} @[[CONST_T2]], i64 12, i1 false) |
| 106 | + // CHECK-NEXT: call void @llvm.memset.p0.i64(ptr {{.*}} %[[T3]], i8 0, i64 12, i1 false) |
| 107 | +} |
| 108 | + |
| 109 | +void test_vla_of_nested_structs(int num_elts) { |
| 110 | + struct T t3[num_elts] = {}; |
| 111 | + // CHECK: define {{.*}} void @test_vla_of_nested_structs(i32 noundef %[[NUM_ELTS_PARAM:.+]]) |
| 112 | + // CHECK-NEXT: entry: |
| 113 | + // CHECK-NEXT: %[[NUM_ELTS_PTR:.+]] = alloca i32 |
| 114 | + // CHECK: %[[VLA_EXPR:.+]] = alloca i64 |
| 115 | + // CHECK-NEXT: store i32 %[[NUM_ELTS_PARAM]], ptr %[[NUM_ELTS_PTR]] |
| 116 | + // CHECK-NEXT: %[[NUM_ELTS_LOCAL:.+]] = load i32, ptr %[[NUM_ELTS_PTR]] |
| 117 | + // CHECK-NEXT: %[[NUM_ELTS_EXT:.+]] = zext i32 %[[NUM_ELTS_LOCAL]] to i64 |
| 118 | + // CHECK: %[[VLA:.+]] = alloca %struct.T, i64 %[[NUM_ELTS_EXT]] |
| 119 | + // CHECK-NEXT: store i64 %[[NUM_ELTS_EXT]], ptr %[[VLA_EXPR]] |
| 120 | + // CHECK-NEXT: %[[COPY_BYTES:.+]] = mul nuw i64 %[[NUM_ELTS_EXT]], 12 |
| 121 | + // CHECK-NEXT: call void @llvm.memset.p0.i64(ptr {{.*}} %[[VLA]], i8 0, i64 %[[COPY_BYTES]], i1 false) |
| 122 | +} |
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