clang/test/CodeGen/compound-literal.c

   1 // RUN: %clang_cc1 -triple x86_64-apple-darwin -emit-llvm %s -o - | FileCheck %s
   2 // RUN: %clang_cc1 -triple x86_64-apple-darwin -fexperimental-new-constant-interpreter -emit-llvm %s -o - | FileCheck %s
   3
   4 // Capture the type and name so matching later is cleaner.
   5 struct CompoundTy { int a; };
   6 // CHECK: @MyCLH ={{.*}} constant [[MY_CLH:[^,]+]]
   7 const struct CompoundTy *const MyCLH = &(struct CompoundTy){3};
   8
   9 int* a = &(int){1};
  10 struct s {int a, b, c;} * b = &(struct s) {1, 2, 3};
  11 _Complex double * x = &(_Complex double){1.0f};
  12 typedef int v4i32 __attribute((vector_size(16)));
  13 v4i32 *y = &(v4i32){1,2,3,4};
  14
  15 // Check generated code for GNU constant array init from compound literal,
  16 // for a global variable.
  17 // CHECK: @compound_array ={{.*}} global [8 x i32] [i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7, i32 8]
  18 int compound_array[] = __extension__(__builtin_choose_expr(0, 0, _Generic(1, int: (int[]){1, 2, 3, 4, 5, 6, 7, 8})));
  19
  20 void xxx(void) {
  21 int* a = &(int){1};
  22 struct s {int a, b, c;} * b = &(struct s) {1, 2, 3};
  23 _Complex double * x = &(_Complex double){1.0f};
  24 }
  25
  26 // CHECK-LABEL: define{{.*}} void @f()
  27 void f(void) {
  28   typedef struct S { int x,y; } S;
  29   // CHECK: [[S:%[a-zA-Z0-9.]+]] = alloca [[STRUCT:%[a-zA-Z0-9.]+]],
  30   struct S s;
  31   // CHECK-NEXT: [[COMPOUNDLIT:%[a-zA-Z0-9.]+]] = alloca [[STRUCT]]
  32   // CHECK-NEXT: [[CX:%[a-zA-Z0-9.]+]] = getelementptr inbounds nuw [[STRUCT]], ptr [[COMPOUNDLIT]], i32 0, i32 0
  33   // CHECK-NEXT: [[SY:%[a-zA-Z0-9.]+]] = getelementptr inbounds nuw [[STRUCT]], ptr [[S]], i32 0, i32 1
  34   // CHECK-NEXT: [[TMP:%[a-zA-Z0-9.]+]] = load i32, ptr [[SY]]
  35   // CHECK-NEXT: store i32 [[TMP]], ptr [[CX]]
  36   // CHECK-NEXT: [[CY:%[a-zA-Z0-9.]+]] = getelementptr inbounds nuw [[STRUCT]], ptr [[COMPOUNDLIT]], i32 0, i32 1
  37   // CHECK-NEXT: [[SX:%[a-zA-Z0-9.]+]] = getelementptr inbounds nuw [[STRUCT]], ptr [[S]], i32 0, i32 0
  38   // CHECK-NEXT: [[TMP:%[a-zA-Z0-9.]+]] = load i32, ptr [[SX]]
  39   // CHECK-NEXT: store i32 [[TMP]], ptr [[CY]]
  40   // CHECK-NEXT: call void @llvm.memcpy{{.*}}(ptr align {{[0-9]+}} [[S]], ptr align {{[0-9]+}} [[COMPOUNDLIT]]
  41   s = (S){s.y,s.x};
  42   // CHECK-NEXT: ret void
  43 }
  44
  45 // CHECK-LABEL: define{{.*}} i48 @g(
  46 struct G { short x, y, z; };
  47 struct G g(int x, int y, int z) {
  48   // CHECK:      [[RESULT:%.*]] = alloca [[G:%.*]], align 2
  49   // CHECK-NEXT: [[X:%.*]] = alloca i32, align 4
  50   // CHECK-NEXT: [[Y:%.*]] = alloca i32, align 4
  51   // CHECK-NEXT: [[Z:%.*]] = alloca i32, align 4
  52   // CHECK-NEXT: [[COERCE_TEMP:%.*]] = alloca i48
  53   // CHECK-NEXT: store i32
  54   // CHECK-NEXT: store i32
  55   // CHECK-NEXT: store i32
  56
  57   // Evaluate the compound literal directly in the result value slot.
  58   // CHECK-NEXT: [[T0:%.*]] = getelementptr inbounds nuw [[G]], ptr [[RESULT]], i32 0, i32 0
  59   // CHECK-NEXT: [[T1:%.*]] = load i32, ptr [[X]], align 4
  60   // CHECK-NEXT: [[T2:%.*]] = trunc i32 [[T1]] to i16
  61   // CHECK-NEXT: store i16 [[T2]], ptr [[T0]], align 2
  62   // CHECK-NEXT: [[T0:%.*]] = getelementptr inbounds nuw [[G]], ptr [[RESULT]], i32 0, i32 1
  63   // CHECK-NEXT: [[T1:%.*]] = load i32, ptr [[Y]], align 4
  64   // CHECK-NEXT: [[T2:%.*]] = trunc i32 [[T1]] to i16
  65   // CHECK-NEXT: store i16 [[T2]], ptr [[T0]], align 2
  66   // CHECK-NEXT: [[T0:%.*]] = getelementptr inbounds nuw [[G]], ptr [[RESULT]], i32 0, i32 2
  67   // CHECK-NEXT: [[T1:%.*]] = load i32, ptr [[Z]], align 4
  68   // CHECK-NEXT: [[T2:%.*]] = trunc i32 [[T1]] to i16
  69   // CHECK-NEXT: store i16 [[T2]], ptr [[T0]], align 2
  70   return (struct G) { x, y, z };
  71
  72   // CHECK-NEXT: call void @llvm.memcpy.p0.p0.i64(ptr align {{[0-9]+}} [[COERCE_TEMP]], ptr align {{[0-9]+}} [[RESULT]], i64 6
  73   // CHECK-NEXT: [[T0:%.*]] = load i48, ptr [[COERCE_TEMP]]
  74   // CHECK-NEXT: ret i48 [[T0]]
  75 }
  76
  77 // We had a bug where we'd emit a new GlobalVariable for each time we used a
  78 // const pointer to a variable initialized by a compound literal.
  79 // CHECK-LABEL: define{{.*}} i32 @compareMyCLH() #0
  80 int compareMyCLH(void) {
  81   // CHECK: store [[MY_CLH]]
  82   const void *a = MyCLH;
  83   // CHECK: store [[MY_CLH]]
  84   const void *b = MyCLH;
  85   return a == b;
  86 }
  87
  88 // Check generated code for GNU constant array init from compound literal,
  89 // for a local variable.
  90 // CHECK-LABEL: define{{.*}} i32 @compound_array_fn()
  91 // CHECK: [[COMPOUND_ARRAY:%.*]] = alloca [8 x i32]
  92 // CHECK: call void @llvm.memcpy.p0.p0.i64({{.*}}, i64 32, i1 false)
  93 int compound_array_fn(void) {
  94   int compound_array[] = (int[]){1,2,3,4,5,6,7,8};
  95   return compound_array[0];
  96 }