//@ compile-flags: -O

#![crate_type = "lib"]
#![feature(core_intrinsics)]

// Tests that codegen works properly when enums like `Result<usize, Box<()>>`
// are represented as `{ u64, ptr }`, i.e., for `Ok(123)`, `123` is stored
// as a pointer.

// CHECK-LABEL: @insert_int
#[no_mangle]
pub fn insert_int(x: usize) -> Result<usize, Box<()>> {
    // CHECK: start:
    // CHECK-NEXT: inttoptr i{{[0-9]+}} %x to ptr
    // CHECK-NEXT: insertvalue
    // CHECK-NEXT: ret { i{{[0-9]+}}, ptr }
    Ok(x)
}

// CHECK-LABEL: @insert_box
#[no_mangle]
pub fn insert_box(x: Box<()>) -> Result<usize, Box<()>> {
    // CHECK: start:
    // CHECK-NEXT: insertvalue { i{{[0-9]+}}, ptr }
    // CHECK-NEXT: ret
    Err(x)
}

// CHECK-LABEL: @extract_int
// CHECK-NOT: nonnull
// CHECK-SAME: (i{{[0-9]+}} {{[^,]+}} [[DISCRIMINANT:%[0-9]+]], ptr {{[^,]+}} [[PAYLOAD:%[0-9]+]])
#[no_mangle]
pub unsafe fn extract_int(x: Result<usize, Box<()>>) -> usize {
    // CHECK: [[TEMP:%.+]] = ptrtoint ptr [[PAYLOAD]] to [[USIZE:i[0-9]+]]
    // CHECK: ret [[USIZE]] [[TEMP]]
    match x {
        Ok(v) => v,
        Err(_) => std::intrinsics::unreachable(),
    }
}

// CHECK-LABEL: @extract_box
// CHECK-SAME: (i{{[0-9]+}} {{[^,]+}} [[DISCRIMINANT:%[0-9]+]], ptr {{[^,]+}} [[PAYLOAD:%[0-9]+]])
#[no_mangle]
pub unsafe fn extract_box(x: Result<usize, Box<i32>>) -> Box<i32> {
    // CHECK: ret ptr [[PAYLOAD]]
    match x {
        Ok(_) => std::intrinsics::unreachable(),
        Err(e) => e,
    }
}