llvm-project/clang/test/CodeGen/init.c

// RUN: %clang_cc1 -triple i386-unknown-unknown -emit-llvm %s -o - | FileCheck %s

void f1() {
  // Scalars in braces.
  int a = { 1 };
}

void f2() {
  int a[2][2] = { { 1, 2 }, { 3, 4 } };
  int b[3][3] = { { 1, 2 }, { 3, 4 } };
  int *c[2] = { &a[1][1], &b[2][2] };
  int *d[2][2] = { {&a[1][1], &b[2][2]}, {&a[0][0], &b[1][1]} };
  int *e[3][3] = { {&a[1][1], &b[2][2]}, {&a[0][0], &b[1][1]} };
  char ext[3][3] = {".Y",".U",".V"};
}

typedef void (* F)(void);
extern void foo(void);
struct S { F f; };
void f3() {
  struct S a[1] = { { foo } };
}

// Constants
// CHECK: @g3 = constant i32 10
// CHECK: @f4.g4 = internal constant i32 12
const int g3 = 10;
int f4() {
  static const int g4 = 12;
  return g4;
}

// PR6537
typedef union vec3 {
  struct { double x, y, z; };
  double component[3];
} vec3;
vec3 f5(vec3 value) {
  return (vec3) {{
    .x = value.x
  }};
}

// rdar://problem/8154689
void f6() {
  int x;
  long ids[] = { (long) &x };  
}




// CHECK: @test7 = global{{.*}}{ i32 0, [4 x i8] c"bar\00" }
// PR8217
struct a7 {
  int  b;
  char v[];
};

struct a7 test7 = { .b = 0, .v = "bar" };


// PR279 comment #3
char test8(int X) {
  char str[100000] = "abc"; // tail should be memset.
  return str[X];
// CHECK: @test8(
// CHECK: call void @llvm.memset
// CHECK: store i8 97
// CHECK: store i8 98
// CHECK: store i8 99
// CHECK-NOT: getelementptr
// CHECK: load
}

void bar(void*);

// PR279
int test9(int X) {
  int Arr[100] = { X };     // Should use memset
  bar(Arr);
// CHECK: @test9
// CHECK: call void @llvm.memset
// CHECK-NOT: store i32 0
// CHECK: call void @bar
}

struct a {
  int a, b, c, d, e, f, g, h, i, j, k, *p;
};

struct b {
  struct a a,b,c,d,e,f,g;
};

int test10(int X) {
  struct b S = { .a.a = X, .d.e = X, .f.e = 0, .f.f = 0, .f.p = 0 };
  bar(&S);

  // CHECK: @test10
  // CHECK: call void @llvm.memset
  // CHECK-NOT: store i32 0
  // CHECK: call void @bar
}


// PR9257
struct test11S {
  int A[10];
};
void test11(struct test11S *P) {
  *P = (struct test11S) { .A = { [0 ... 3] = 4 } };
  // CHECK: @test11
  // CHECK: store i32 4
  // CHECK: store i32 4
  // CHECK: store i32 4
  // CHECK: store i32 4
  // CHECK: ret void
}


// Verify that we can convert a recursive struct with a memory that returns
// an instance of the struct we're converting.
struct test12 {
  struct test12 (*p)(void);
} test12g;


void test13(int x) {
  struct X { int a; int b : 10; int c; };
  struct X y = {.c = x};
  // CHECK: @test13
  // CHECK: and i16 {{.*}}, -1024
}

// CHECK-LABEL: @PR20473
void PR20473() {
  // CHECK: memcpy{{.*}}([2 x i8]* @
  bar((char[2]) {""});
  // CHECK: memcpy{{.*}}([3 x i8]* @
  bar((char[3]) {""});
}