llvm-project/clang/test/CodeGen/mms-bitfields.c

// RUN: %clang_cc1 -triple i386-apple-darwin10 -mms-bitfields -emit-llvm %s -o - | FileCheck %s

struct s1 {
  int       f32;
  long long f64;
} s1;

// CHECK: %struct.s1 = type { i32, [4 x i8], i64 }

struct s2 {
  int       f32;
  long long f64[4];
} s2;

// CHECK: %struct.s2 = type { i32, [4 x i8], [4 x i64] }

struct s3 {
  int       f32;
  struct s1 s;
} s3;

// CHECK: %struct.s3 = type { i32, [4 x i8], %struct.s1 }

// PR32482:

#pragma pack (push,1)

typedef unsigned int UINT32;

struct Inner {
  UINT32    A    :  1;
  UINT32    B    :  1;
  UINT32    C    :  1;
  UINT32    D    : 30;
} Inner;

#pragma pack (pop)

// CHECK: %struct.Inner = type { i32, i32 }

// CHECK: %struct.A = type { i32, i32, i32 }

#pragma pack(push, 1)

union HEADER {
  struct A {
    int                                         :  3;  // Bits 2:0
    int a                                       :  9;  // Bits 11:3
    int                                         :  12;  // Bits 23:12
    int b                                       :  17;  // Bits 40:24
    int                                         :  7;  // Bits 47:41
    int c                                       :  4;  // Bits 51:48
    int                                         :  4;  // Bits 55:52
    int d                                       :  3;  // Bits 58:56
    int                                         :  5;  // Bits 63:59
  } Bits;
} HEADER;

#pragma pack(pop)

struct Inner variable = { 1,0,1, 21 };
union HEADER hdr = {{1,2,3,4}};

// CHECK: @variable = global { i8, [3 x i8], i8, i8, i8, i8 } { i8 5, [3 x i8] undef, i8 21, i8 0, i8 0, i8 0 }, align 1
// CHECK: @hdr = global { { i8, i8, [2 x i8], i8, i8, i8, i8, i8, [3 x i8] } } { { i8, i8, [2 x i8], i8, i8, i8, i8, i8, [3 x i8] } { i8 8, i8 0, [2 x i8] undef, i8 2, i8 0, i8 0, i8 3, i8 4, [3 x i8] undef } }, align 1