clang/test/CodeGen/compound-literal.c

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