clang/test/CodeGen/packed-nest-unpacked.c

// RUN: %clang_cc1 %s -triple x86_64-apple-macosx10.7.2 -emit-llvm -o - | FileCheck %s

struct X { int x[6]; };
struct Y { char x[13]; struct X y; } __attribute((packed));
struct Y g;
void f(struct X);
struct X foo(void);

// <rdar://problem/10463337>
struct X test1() {
  // CHECK: @test1
  // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* {{.*}}, i8* bitcast (%struct.X* getelementptr inbounds (%struct.Y* @g, i32 0, i32 1) to i8*), i64 24, i32 1, i1 false)
  return g.y;
}
struct X test2() {
  // CHECK: @test2
  // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* {{.*}}, i8* bitcast (%struct.X* getelementptr inbounds (%struct.Y* @g, i32 0, i32 1) to i8*), i64 24, i32 1, i1 false)
  struct X a = g.y;
  return a;
}

void test3(struct X a) {
  // CHECK: @test3
  // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* bitcast (%struct.X* getelementptr inbounds (%struct.Y* @g, i32 0, i32 1) to i8*), i8* {{.*}}, i64 24, i32 1, i1 false)
  g.y = a;
}

// <rdar://problem/10530444>
void test4() {
  // CHECK: @test4
  // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* {{.*}}, i8* bitcast (%struct.X* getelementptr inbounds (%struct.Y* @g, i32 0, i32 1) to i8*), i64 24, i32 1, i1 false)
  f(g.y);
}

// PR12395
int test5() {
  // CHECK: @test5
  // CHECK: load i32* getelementptr inbounds (%struct.Y* @g, i32 0, i32 1, i32 0, i64 0), align 1
  return g.y.x[0];
}

// <rdar://problem/11220251>
void test6() {
  // CHECK: @test6
  // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* bitcast (%struct.X* getelementptr inbounds (%struct.Y* @g, i32 0, i32 1) to i8*), i8* %{{.*}}, i64 24, i32 1, i1 false)
  g.y = foo();
}


struct XBitfield {
  unsigned b1 : 10;
  unsigned b2 : 12;
  unsigned b3 : 10;
};
struct YBitfield {
  char x;
  struct XBitfield y;
} __attribute((packed));
struct YBitfield gbitfield;

unsigned test7() {
  // CHECK: @test7
  // CHECK: load i32* bitcast (%struct.XBitfield* getelementptr inbounds (%struct.YBitfield* @gbitfield, i32 0, i32 1) to i32*), align 4
  return gbitfield.y.b2;
}