test/CodeGen/arm-varargs.c

// RUN: %clang_cc1 -triple arm-none-eabi -emit-llvm -o - %s | FileCheck --check-prefix=CHECK --check-prefix=CHECK-LE %s
// RUN: %clang_cc1 -triple armeb-none-eabi -emit-llvm -o - %s | FileCheck --check-prefix=CHECK --check-prefix=CHECK-BE %s

#include <stdarg.h>

// Obviously there's more than one way to implement va_arg. This test should at
// least prevent unintentional regressions caused by refactoring.

va_list the_list;

int simple_int(void) {
// CHECK-LABEL: define i32 @simple_int
  return va_arg(the_list, int);
// CHECK: [[CUR:%[a-z0-9._]+]] = load i8*, i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[NEXT:%[a-z0-9._]+]] = getelementptr inbounds i8, i8* [[CUR]], i32 4
// CHECK: store i8* [[NEXT]], i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[ADDR:%[a-z0-9._]+]] = bitcast i8* [[CUR]] to i32*
// CHECK: [[RESULT:%[a-z0-9._]+]] = load i32, i32* [[ADDR]]
// CHECK: ret i32 [[RESULT]]
}

struct bigstruct {
  int a[10];
};

struct bigstruct simple_struct(void) {
// CHECK-LABEL: define void @simple_struct(%struct.bigstruct* noalias sret %agg.result)
  return va_arg(the_list, struct bigstruct);
// CHECK: [[CUR:%[a-z0-9._]+]] = load i8*, i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[NEXT:%[a-z0-9._]+]] = getelementptr inbounds i8, i8* [[CUR]], i32 40
// CHECK: store i8* [[NEXT]], i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[ADDR:%[a-z0-9._]+]] = bitcast i8* [[CUR]] to %struct.bigstruct*
// CHECK: [[DEST_ADDR:%[a-z0-9._]+]] = bitcast %struct.bigstruct* %agg.result to i8*
// CHECK: [[SRC_ADDR:%[a-z0-9._]+]] = bitcast %struct.bigstruct* [[ADDR]] to i8*
// CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 4 [[DEST_ADDR]], i8* align 4 [[SRC_ADDR]], i32 40, i1 false)
// CHECK: ret void
}

struct aligned_bigstruct {
  float a;
  long double b;
};

struct aligned_bigstruct simple_aligned_struct(void) {
// CHECK-LABEL: define void @simple_aligned_struct(%struct.aligned_bigstruct* noalias sret %agg.result)
  return va_arg(the_list, struct aligned_bigstruct);
// CHECK: [[CUR:%[a-z0-9._]+]] = load i8*, i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[CUR_INT:%[a-z0-9._]+]] = ptrtoint i8* [[CUR]] to i32
// CHECK: [[CUR_INT_ADD:%[a-z0-9._]+]] = add i32 [[CUR_INT]], 7
// CHECK: [[CUR_INT_ALIGNED:%[a-z0-9._]+]] = and i32 [[CUR_INT_ADD]], -8
// CHECK: [[CUR_ALIGNED:%[a-z0-9._]+]] = inttoptr i32 [[CUR_INT_ALIGNED]] to i8*
// CHECK: [[NEXT:%[a-z0-9._]+]] = getelementptr inbounds i8, i8* [[CUR_ALIGNED]], i32 16
// CHECK: store i8* [[NEXT]], i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[ADDR:%[a-z0-9._]+]] = bitcast i8* [[CUR_ALIGNED]] to %struct.aligned_bigstruct*
// CHECK: [[DEST_ADDR:%[a-z0-9._]+]] = bitcast %struct.aligned_bigstruct* %agg.result to i8*
// CHECK: [[SRC_ADDR:%[a-z0-9._]+]] = bitcast %struct.aligned_bigstruct* [[ADDR]] to i8*
// CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 8 [[DEST_ADDR]], i8* align 8 [[SRC_ADDR]], i32 16, i1 false)
// CHECK: ret void
}

double simple_double(void) {
// CHECK-LABEL: define double @simple_double
  return va_arg(the_list, double);
// CHECK: [[CUR:%[a-z0-9._]+]] = load i8*, i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[CUR_INT:%[a-z0-9._]+]] = ptrtoint i8* [[CUR]] to i32
// CHECK: [[CUR_INT_ADD:%[a-z0-9._]+]] = add i32 [[CUR_INT]], 7
// CHECK: [[CUR_INT_ALIGNED:%[a-z0-9._]+]] = and i32 [[CUR_INT_ADD]], -8
// CHECK: [[CUR_ALIGNED:%[a-z0-9._]+]] = inttoptr i32 [[CUR_INT_ALIGNED]] to i8*
// CHECK: [[NEXT:%[a-z0-9._]+]] = getelementptr inbounds i8, i8* [[CUR_ALIGNED]], i32 8
// CHECK: store i8* [[NEXT]], i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[ADDR:%[a-z0-9._]+]] = bitcast i8* [[CUR_ALIGNED]] to double*
// CHECK: [[RESULT:%[a-z0-9._]+]] = load double, double* [[ADDR]]
// CHECK: ret double [[RESULT]]
}

struct hfa {
  float a, b;
};

struct hfa simple_hfa(void) {
// CHECK-LABEL: define void @simple_hfa(%struct.hfa* noalias sret %agg.result)
  return va_arg(the_list, struct hfa);
// CHECK: [[CUR:%[a-z0-9._]+]] = load i8*, i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[NEXT:%[a-z0-9._]+]] = getelementptr inbounds i8, i8* [[CUR]], i32 8
// CHECK: store i8* [[NEXT]], i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[ADDR:%[a-z0-9._]+]] = bitcast i8* [[CUR]] to %struct.hfa*
// CHECK: [[DEST_ADDR:%[a-z0-9._]+]] = bitcast %struct.hfa* %agg.result to i8*
// CHECK: [[SRC_ADDR:%[a-z0-9._]+]] = bitcast %struct.hfa* [[ADDR]] to i8*
// CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 4 [[DEST_ADDR]], i8* align 4 [[SRC_ADDR]], i32 8, i1 false)
// CHECK: ret void
}

// Over and under alignment on fundamental types has no effect on parameter
// passing, so the code generated for va_arg should be the same as for
// non-aligned fundamental types.

typedef int underaligned_int __attribute__((packed,aligned(2)));
underaligned_int underaligned_int_test() {
// CHECK-LABEL: define i32 @underaligned_int_test()
  return va_arg(the_list, underaligned_int);
// CHECK: [[CUR:%[a-z0-9._]+]] = load i8*, i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[NEXT:%[a-z0-9._]+]] = getelementptr inbounds i8, i8* [[CUR]], i32 4
// CHECK: store i8* [[NEXT]], i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[ADDR:%[a-z0-9._]+]] = bitcast i8* [[CUR]] to i32*
// CHECK: [[RESULT:%[a-z0-9._]+]] = load i32, i32* [[ADDR]]
// CHECK: ret i32 [[RESULT]]
}

typedef int overaligned_int __attribute__((aligned(32)));
overaligned_int overaligned_int_test() {
// CHECK-LABEL: define i32 @overaligned_int_test()
  return va_arg(the_list, overaligned_int);
// CHECK: [[CUR:%[a-z0-9._]+]] = load i8*, i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[NEXT:%[a-z0-9._]+]] = getelementptr inbounds i8, i8* [[CUR]], i32 4
// CHECK: store i8* [[NEXT]], i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[ADDR:%[a-z0-9._]+]] = bitcast i8* [[CUR]] to i32*
// CHECK: [[RESULT:%[a-z0-9._]+]] = load i32, i32* [[ADDR]]
// CHECK: ret i32 [[RESULT]]
}

typedef long long underaligned_long_long  __attribute__((packed,aligned(2)));
underaligned_long_long underaligned_long_long_test() {
// CHECK-LABEL: define i64 @underaligned_long_long_test()
  return va_arg(the_list, underaligned_long_long);
// CHECK: [[CUR:%[a-z0-9._]+]] = load i8*, i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[CUR_INT:%[a-z0-9._]+]] = ptrtoint i8* [[CUR]] to i32
// CHECK: [[CUR_INT_ADD:%[a-z0-9._]+]] = add i32 [[CUR_INT]], 7
// CHECK: [[CUR_INT_ALIGNED:%[a-z0-9._]+]] = and i32 [[CUR_INT_ADD]], -8
// CHECK: [[CUR_ALIGNED:%[a-z0-9._]+]] = inttoptr i32 [[CUR_INT_ALIGNED]] to i8*
// CHECK: [[NEXT:%[a-z0-9._]+]] = getelementptr inbounds i8, i8* [[CUR_ALIGNED]], i32 8
// CHECK: store i8* [[NEXT]], i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[ADDR:%[a-z0-9._]+]] = bitcast i8* [[CUR_ALIGNED]] to i64*
// CHECK: [[RESULT:%[a-z0-9._]+]] = load i64, i64* [[ADDR]]
// CHECK: ret i64 [[RESULT]]
}

typedef long long overaligned_long_long  __attribute__((aligned(32)));
overaligned_long_long overaligned_long_long_test() {
// CHECK-LABEL: define i64 @overaligned_long_long_test()
  return va_arg(the_list, overaligned_long_long);
// CHECK: [[CUR:%[a-z0-9._]+]] = load i8*, i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[CUR_INT:%[a-z0-9._]+]] = ptrtoint i8* [[CUR]] to i32
// CHECK: [[CUR_INT_ADD:%[a-z0-9._]+]] = add i32 [[CUR_INT]], 7
// CHECK: [[CUR_INT_ALIGNED:%[a-z0-9._]+]] = and i32 [[CUR_INT_ADD]], -8
// CHECK: [[CUR_ALIGNED:%[a-z0-9._]+]] = inttoptr i32 [[CUR_INT_ALIGNED]] to i8*
// CHECK: [[NEXT:%[a-z0-9._]+]] = getelementptr inbounds i8, i8* [[CUR_ALIGNED]], i32 8
// CHECK: store i8* [[NEXT]], i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[ADDR:%[a-z0-9._]+]] = bitcast i8* [[CUR_ALIGNED]] to i64*
// CHECK: [[RESULT:%[a-z0-9._]+]] = load i64, i64* [[ADDR]]
// CHECK: ret i64 [[RESULT]]
}

// The way that attributes applied to a struct change parameter passing is a
// little strange, in that the alignment due to attributes is used when
// calculating the size of the struct, but the alignment is based only on the
// alignment of the members (which can be affected by attributes). What this
// means is:
//  * The only effect of the aligned attribute on a struct is to increase its
//    size if the alignment is greater than the member alignment.
//  * The packed attribute is considered as applying to the members, so it will
//    affect the alignment.
// Additionally the alignment can't go below 4 or above 8, so it's only
// long long and double that can be affected by a change in alignment.

typedef struct __attribute__((packed,aligned(2))) {
  int val;
} underaligned_int_struct;
underaligned_int_struct underaligned_int_struct_test() {
// CHECK-LABEL: define i32 @underaligned_int_struct_test()
  return va_arg(the_list, underaligned_int_struct);
// CHECK: [[RETVAL:%[a-z0-9._]+]] = alloca %struct.underaligned_int_struct, align 2
// CHECK: [[CUR:%[a-z0-9._]+]] = load i8*, i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[NEXT:%[a-z0-9._]+]] = getelementptr inbounds i8, i8* [[CUR]], i32 4
// CHECK: store i8* [[NEXT]], i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[ADDR:%[a-z0-9._]+]] = bitcast i8* [[CUR]] to %struct.underaligned_int_struct*
// CHECK: [[DEST_ADDR:%[a-z0-9._]+]] = bitcast %struct.underaligned_int_struct* [[RETVAL]] to i8*
// CHECK: [[SRC_ADDR:%[a-z0-9._]+]] = bitcast %struct.underaligned_int_struct* [[ADDR]] to i8*
// CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 2 [[DEST_ADDR]], i8* align 4 [[SRC_ADDR]], i32 4, i1 false)
// CHECK: [[COERCE:%[a-z0-9._]+]] = getelementptr inbounds %struct.underaligned_int_struct, %struct.underaligned_int_struct* [[RETVAL]], i32 0, i32 0
// CHECK: [[RESULT:%[a-z0-9._]+]] = load i32, i32* [[COERCE]]
// CHECK: ret i32 [[RESULT]]
}

typedef struct __attribute__((aligned(16))) {
  int val;
} overaligned_int_struct;
overaligned_int_struct overaligned_int_struct_test() {
// CHECK-LABEL: define void @overaligned_int_struct_test(%struct.overaligned_int_struct* noalias sret %agg.result)
  return va_arg(the_list, overaligned_int_struct);
// CHECK: [[CUR:%[a-z0-9._]+]] = load i8*, i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[NEXT:%[a-z0-9._]+]] = getelementptr inbounds i8, i8* [[CUR]], i32 16
// CHECK: store i8* [[NEXT]], i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[ADDR:%[a-z0-9._]+]] = bitcast i8* [[CUR]] to %struct.overaligned_int_struct*
// CHECK: [[DEST_ADDR:%[a-z0-9._]+]] = bitcast %struct.overaligned_int_struct* %agg.result to i8*
// CHECK: [[SRC_ADDR:%[a-z0-9._]+]] = bitcast %struct.overaligned_int_struct* [[ADDR]] to i8*
// CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 16 [[DEST_ADDR]], i8* align 4 [[SRC_ADDR]], i32 16, i1 false)
// CHECK: ret void
}

typedef struct __attribute__((packed,aligned(2))) {
  long long val;
} underaligned_long_long_struct;
underaligned_long_long_struct underaligned_long_long_struct_test() {
// CHECK-LABEL: define void @underaligned_long_long_struct_test(%struct.underaligned_long_long_struct* noalias sret %agg.result)
  return va_arg(the_list, underaligned_long_long_struct);
// CHECK: [[CUR:%[a-z0-9._]+]] = load i8*, i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[NEXT:%[a-z0-9._]+]] = getelementptr inbounds i8, i8* [[CUR]], i32 8
// CHECK: store i8* [[NEXT]], i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[ADDR:%[a-z0-9._]+]] = bitcast i8* [[CUR]] to %struct.underaligned_long_long_struct*
// CHECK: [[DEST_ADDR:%[a-z0-9._]+]] = bitcast %struct.underaligned_long_long_struct* %agg.result to i8*
// CHECK: [[SRC_ADDR:%[a-z0-9._]+]] = bitcast %struct.underaligned_long_long_struct* [[ADDR]] to i8*
// CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 2 [[DEST_ADDR]], i8* align 4 [[SRC_ADDR]], i32 8, i1 false)
// CHECK: ret void
}

typedef struct __attribute__((aligned(16))) {
  long long val;
} overaligned_long_long_struct;
overaligned_long_long_struct overaligned_long_long_struct_test() {
// CHECK-LABEL: define void @overaligned_long_long_struct_test(%struct.overaligned_long_long_struct* noalias sret %agg.result)
  return va_arg(the_list, overaligned_long_long_struct);
// CHECK: [[CUR:%[a-z0-9._]+]] = load i8*, i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[CUR_INT:%[a-z0-9._]+]] = ptrtoint i8* [[CUR]] to i32
// CHECK: [[CUR_INT_ADD:%[a-z0-9._]+]] = add i32 [[CUR_INT]], 7
// CHECK: [[CUR_INT_ALIGNED:%[a-z0-9._]+]] = and i32 [[CUR_INT_ADD]], -8
// CHECK: [[CUR_ALIGNED:%[a-z0-9._]+]] = inttoptr i32 [[CUR_INT_ALIGNED]] to i8*
// CHECK: [[NEXT:%[a-z0-9._]+]] = getelementptr inbounds i8, i8* [[CUR_ALIGNED]], i32 16
// CHECK: store i8* [[NEXT]], i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[ADDR:%[a-z0-9._]+]] = bitcast i8* [[CUR_ALIGNED]] to %struct.overaligned_long_long_struct*
// CHECK: [[DEST_ADDR:%[a-z0-9._]+]] = bitcast %struct.overaligned_long_long_struct* %agg.result to i8*
// CHECK: [[SRC_ADDR:%[a-z0-9._]+]] = bitcast %struct.overaligned_long_long_struct* [[ADDR]] to i8*
// CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 16 [[DEST_ADDR]], i8* align 8 [[SRC_ADDR]], i32 16, i1 false)
// CHECK: ret void
}

// Overaligning or underaligning a struct member changes both its alignment and
// size when passed as an argument.

typedef struct {
  int val __attribute__((packed,aligned(2)));
} underaligned_int_struct_member;
underaligned_int_struct_member underaligned_int_struct_member_test() {
// CHECK-LABEL: define i32 @underaligned_int_struct_member_test()
  return va_arg(the_list, underaligned_int_struct_member);
// CHECK: [[RETVAL:%[a-z0-9._]+]] = alloca %struct.underaligned_int_struct_member, align 2
// CHECK: [[CUR:%[a-z0-9._]+]] = load i8*, i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[NEXT:%[a-z0-9._]+]] = getelementptr inbounds i8, i8* [[CUR]], i32 4
// CHECK: store i8* [[NEXT]], i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[ADDR:%[a-z0-9._]+]] = bitcast i8* [[CUR]] to %struct.underaligned_int_struct_member*
// CHECK: [[DEST_ADDR:%[a-z0-9._]+]] = bitcast %struct.underaligned_int_struct_member* [[RETVAL]] to i8*
// CHECK: [[SRC_ADDR:%[a-z0-9._]+]] = bitcast %struct.underaligned_int_struct_member* [[ADDR]] to i8*
// CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 2 [[DEST_ADDR]], i8* align 4 [[SRC_ADDR]], i32 4, i1 false)
// CHECK: [[COERCE:%[a-z0-9._]+]] = getelementptr inbounds %struct.underaligned_int_struct_member, %struct.underaligned_int_struct_member* [[RETVAL]], i32 0, i32 0
// CHECK: [[RESULT:%[a-z0-9._]+]] = load i32, i32* [[COERCE]]
// CHECK: ret i32 [[RESULT]]
}

typedef struct {
  int val __attribute__((aligned(16)));
} overaligned_int_struct_member;
overaligned_int_struct_member overaligned_int_struct_member_test() {
// CHECK-LABEL: define void @overaligned_int_struct_member_test(%struct.overaligned_int_struct_member* noalias sret %agg.result)
  return va_arg(the_list, overaligned_int_struct_member);
// CHECK: [[CUR:%[a-z0-9._]+]] = load i8*, i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[CUR_INT:%[a-z0-9._]+]] = ptrtoint i8* [[CUR]] to i32
// CHECK: [[CUR_INT_ADD:%[a-z0-9._]+]] = add i32 [[CUR_INT]], 7
// CHECK: [[CUR_INT_ALIGNED:%[a-z0-9._]+]] = and i32 [[CUR_INT_ADD]], -8
// CHECK: [[CUR_ALIGNED:%[a-z0-9._]+]] = inttoptr i32 [[CUR_INT_ALIGNED]] to i8*
// CHECK: [[NEXT:%[a-z0-9._]+]] = getelementptr inbounds i8, i8* [[CUR_ALIGNED]], i32 16
// CHECK: store i8* [[NEXT]], i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[ADDR:%[a-z0-9._]+]] = bitcast i8* [[CUR_ALIGNED]] to %struct.overaligned_int_struct_member*
// CHECK: [[DEST_ADDR:%[a-z0-9._]+]] = bitcast %struct.overaligned_int_struct_member* %agg.result to i8*
// CHECK: [[SRC_ADDR:%[a-z0-9._]+]] = bitcast %struct.overaligned_int_struct_member* [[ADDR]] to i8*
// CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 16 [[DEST_ADDR]], i8* align 8 [[SRC_ADDR]], i32 16, i1 false)
// CHECK: ret void
}

typedef struct {
  long long val __attribute__((packed,aligned(2)));
} underaligned_long_long_struct_member;
underaligned_long_long_struct_member underaligned_long_long_struct_member_test() {
// CHECK-LABEL: define void @underaligned_long_long_struct_member_test(%struct.underaligned_long_long_struct_member* noalias sret %agg.result)
  return va_arg(the_list, underaligned_long_long_struct_member);
// CHECK: [[CUR:%[a-z0-9._]+]] = load i8*, i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[NEXT:%[a-z0-9._]+]] = getelementptr inbounds i8, i8* [[CUR]], i32 8
// CHECK: store i8* [[NEXT]], i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[ADDR:%[a-z0-9._]+]] = bitcast i8* [[CUR]] to %struct.underaligned_long_long_struct_member*
// CHECK: [[DEST_ADDR:%[a-z0-9._]+]] = bitcast %struct.underaligned_long_long_struct_member* %agg.result to i8*
// CHECK: [[SRC_ADDR:%[a-z0-9._]+]] = bitcast %struct.underaligned_long_long_struct_member* [[ADDR]] to i8*
// CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 2 [[DEST_ADDR]], i8* align 4 [[SRC_ADDR]], i32 8, i1 false)
// CHECK: ret void
}

typedef struct {
  long long val __attribute__((aligned(16)));
} overaligned_long_long_struct_member;
overaligned_long_long_struct_member overaligned_long_long_struct_member_test() {
// CHECK-LABEL: define void @overaligned_long_long_struct_member_test(%struct.overaligned_long_long_struct_member* noalias sret %agg.result)
  return va_arg(the_list, overaligned_long_long_struct_member);
// CHECK: [[CUR:%[a-z0-9._]+]] = load i8*, i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[CUR_INT:%[a-z0-9._]+]] = ptrtoint i8* [[CUR]] to i32
// CHECK: [[CUR_INT_ADD:%[a-z0-9._]+]] = add i32 [[CUR_INT]], 7
// CHECK: [[CUR_INT_ALIGNED:%[a-z0-9._]+]] = and i32 [[CUR_INT_ADD]], -8
// CHECK: [[CUR_ALIGNED:%[a-z0-9._]+]] = inttoptr i32 [[CUR_INT_ALIGNED]] to i8*
// CHECK: [[NEXT:%[a-z0-9._]+]] = getelementptr inbounds i8, i8* [[CUR_ALIGNED]], i32 16
// CHECK: store i8* [[NEXT]], i8** getelementptr inbounds (%struct.__va_list, %struct.__va_list* @the_list, i32 0, i32 0), align 4
// CHECK: [[ADDR:%[a-z0-9._]+]] = bitcast i8* [[CUR_ALIGNED]] to %struct.overaligned_long_long_struct_member*
// CHECK: [[DEST_ADDR:%[a-z0-9._]+]] = bitcast %struct.overaligned_long_long_struct_member* %agg.result to i8*
// CHECK: [[SRC_ADDR:%[a-z0-9._]+]] = bitcast %struct.overaligned_long_long_struct_member* [[ADDR]] to i8*
// CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 16 [[DEST_ADDR]], i8* align 8 [[SRC_ADDR]], i32 16, i1 false)
// CHECK: ret void
}

void check_start(int n, ...) {
// CHECK-LABEL: define void @check_start(i32 %n, ...)

  va_list the_list;
  va_start(the_list, n);
// CHECK: [[THE_LIST:%[a-z0-9._]+]] = alloca %struct.__va_list
// CHECK: [[VOIDP_THE_LIST:%[a-z0-9._]+]] = bitcast %struct.__va_list* [[THE_LIST]] to i8*
// CHECK: call void @llvm.va_start(i8* [[VOIDP_THE_LIST]])
}