5fc1b74af5
This adds code that was previously missing from emitAutoVarAlloca to identify when an aggregate auto var is being emitted with a constant initializer, and the associated code that is called from emitAutoVarInit to store the constant. This allows significantly more efficient initialization.
125 lines
4.3 KiB
C++
125 lines
4.3 KiB
C++
// RUN: %clang_cc1 -std=c++20 -triple x86_64-unknown-linux-gnu -fclangir -emit-llvm %s -o %t-cir.ll
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// RUN: FileCheck --input-file=%t-cir.ll %s
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int a[10];
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// CHECK: @a = global [10 x i32] zeroinitializer
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int aa[10][5];
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// CHECK: @aa = global [10 x [5 x i32]] zeroinitializer
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int c[10] = {};
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// CHECK: @c = global [10 x i32] zeroinitializer
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int d[3] = {1, 2, 3};
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// CHECK: @d = global [3 x i32] [i32 1, i32 2, i32 3]
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int dd[3][2] = {{1, 2}, {3, 4}, {5, 6}};
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// CHECK: @dd = global [3 x [2 x i32]] [
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// CHECK: [2 x i32] [i32 1, i32 2], [2 x i32]
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// CHECK: [i32 3, i32 4], [2 x i32] [i32 5, i32 6]]
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int e[10] = {1, 2};
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// CHECK: @e = global <{ i32, i32, [8 x i32] }> <{ i32 1, i32 2, [8 x i32] zeroinitializer }>
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int f[5] = {1, 2};
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// CHECK: @f = global [5 x i32] [i32 1, i32 2, i32 0, i32 0, i32 0]
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extern int b[10];
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// CHECK: @b = external global [10 x i32]
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extern int bb[10][5];
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// CHECK: @bb = external global [10 x [5 x i32]]
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// This function is only here to make sure the external globals are emitted.
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void reference_externs() {
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b;
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bb;
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}
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void func() {
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int arr[10];
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int e = arr[0];
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int e2 = arr[1];
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}
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// CHECK: define{{.*}} void @_Z4funcv()
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// CHECK-NEXT: %[[ARR_ALLOCA:.*]] = alloca [10 x i32], i64 1, align 16
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// CHECK-NEXT: %[[INIT:.*]] = alloca i32, i64 1, align 4
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// CHECK-NEXT: %[[INIT_2:.*]] = alloca i32, i64 1, align 4
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// CHECK-NEXT: %[[ARR_PTR:.*]] = getelementptr i32, ptr %[[ARR_ALLOCA]], i32 0
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// CHECK-NEXT: %[[ELE_PTR:.*]] = getelementptr i32, ptr %[[ARR_PTR]], i64 0
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// CHECK-NEXT: %[[TMP:.*]] = load i32, ptr %[[ELE_PTR]], align 16
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// CHECK-NEXT: store i32 %[[TMP]], ptr %[[INIT]], align 4
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// CHECK-NEXT: %[[ARR_PTR:.*]] = getelementptr i32, ptr %[[ARR_ALLOCA]], i32 0
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// CHECK-NEXT: %[[ELE_PTR:.*]] = getelementptr i32, ptr %[[ARR_PTR]], i64 1
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// CHECK-NEXT: %[[TMP:.*]] = load i32, ptr %[[ELE_PTR]], align 4
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// CHECK-NEXT: store i32 %[[TMP]], ptr %[[INIT_2]], align 4
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void func2() {
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int arr[2] = {5};
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}
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// CHECK: define{{.*}} void @_Z5func2v()
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// CHECK: %[[ARR:.*]] = alloca [2 x i32], i64 1, align 4
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// CHECK: store [2 x i32] [i32 5, i32 0], ptr %[[ARR]], align 4
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// CHECK: ret void
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void func3() {
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int arr3[2] = {5, 6};
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}
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// CHECK: define{{.*}} void @_Z5func3v()
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// CHECK: %[[ARR_ALLOCA:.*]] = alloca [2 x i32], i64 1, align 4
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// CHECK: store [2 x i32] [i32 5, i32 6], ptr %[[ARR_ALLOCA]], align 4
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void func4() {
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int arr[2][1] = {{5}, {6}};
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int e = arr[1][0];
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}
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// CHECK: define{{.*}} void @_Z5func4v()
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// CHECK: %[[ARR_ALLOCA:.*]] = alloca [2 x [1 x i32]], i64 1, align 4
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// CHECK: %[[INIT:.*]] = alloca i32, i64 1, align 4
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// CHECK: store [2 x [1 x i32]] {{\[}}[1 x i32] [i32 5], [1 x i32] [i32 6]], ptr %[[ARR_ALLOCA]], align 4
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// CHECK: %[[ARR_PTR:.*]] = getelementptr [1 x i32], ptr %[[ARR_ALLOCA]], i32 0
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// CHECK: %[[ARR_1:.*]] = getelementptr [1 x i32], ptr %[[ARR_PTR]], i64 1
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// CHECK: %[[ARR_1_0:.*]] = getelementptr i32, ptr %[[ARR_1]], i32 0
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// CHECK: %[[ELE_PTR:.*]] = getelementptr i32, ptr %[[ARR_1_0]], i64 0
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// CHECK: %[[TMP:.*]] = load i32, ptr %[[ELE_PTR]], align 4
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// CHECK: store i32 %[[TMP]], ptr %[[INIT]], align 4
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void func5() {
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int arr[2][1] = {{5}};
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}
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// CHECK: define{{.*}} void @_Z5func5v()
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// CHECK: %[[ARR:.*]] = alloca [2 x [1 x i32]], i64 1, align 4
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// CHECK: store [2 x [1 x i32]] {{\[}}[1 x i32] [i32 5], [1 x i32] zeroinitializer], ptr %[[ARR]], align 4
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// CHECK: ret void
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void func6() {
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int x = 4;
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int arr[2] = { x, 5 };
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}
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// CHECK: define{{.*}} void @_Z5func6v()
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// CHECK: %[[VAR:.*]] = alloca i32, i64 1, align 4
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// CHECK: %[[ARR:.*]] = alloca [2 x i32], i64 1, align 4
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// CHECK: store i32 4, ptr %[[VAR]], align 4
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// CHECK: %[[ELE_0:.*]] = getelementptr i32, ptr %[[ARR]], i32 0
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// CHECK: %[[TMP:.*]] = load i32, ptr %[[VAR]], align 4
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// CHECK: store i32 %[[TMP]], ptr %[[ELE_0]], align 4
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// CHECK: %[[ELE_1:.*]] = getelementptr i32, ptr %[[ELE_0]], i64 1
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// CHECK: store i32 5, ptr %[[ELE_1]], align 4
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void func7() {
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int* arr[1] = {};
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}
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// CHECK: define{{.*}} void @_Z5func7v()
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// CHECK: %[[ARR:.*]] = alloca [1 x ptr], i64 1, align 8
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// CHECK: store [1 x ptr] zeroinitializer, ptr %[[ARR]], align 8
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// CHECK: ret void
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void func8(int p[10]) {}
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// CHECK: define{{.*}} void @_Z5func8Pi(ptr {{%.*}})
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// CHECK-NEXT: alloca ptr, i64 1, align 8
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void func9(int pp[10][5]) {}
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// CHECK: define{{.*}} void @_Z5func9PA5_i(ptr {{%.*}})
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// CHECK-NEXT: alloca ptr, i64 1, align 8
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