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// unit-test: LowerIntrinsics
// EMIT_MIR_FOR_EACH_PANIC_STRATEGY
#![feature(core_intrinsics, intrinsics, rustc_attrs)]
#![crate_type = "lib"]
// EMIT_MIR lower_intrinsics.wrapping.LowerIntrinsics.diff
pub fn wrapping(a: i32, b: i32) {
// CHECK-LABEL: fn wrapping(
// CHECK: {{_.*}} = Add(
// CHECK: {{_.*}} = Sub(
// CHECK: {{_.*}} = Mul(
let _x = core::intrinsics::wrapping_add(a, b);
let _y = core::intrinsics::wrapping_sub(a, b);
let _z = core::intrinsics::wrapping_mul(a, b);
}
// EMIT_MIR lower_intrinsics.unchecked.LowerIntrinsics.diff
pub unsafe fn unchecked(a: i32, b: i32) {
// CHECK-LABEL: fn unchecked(
// CHECK: {{_.*}} = AddUnchecked(
// CHECK: {{_.*}} = SubUnchecked(
// CHECK: {{_.*}} = MulUnchecked(
// CHECK: {{_.*}} = Div(
// CHECK: {{_.*}} = Rem(
// CHECK: {{_.*}} = ShlUnchecked(
// CHECK: {{_.*}} = ShrUnchecked(
let _a = core::intrinsics::unchecked_add(a, b);
let _b = core::intrinsics::unchecked_sub(a, b);
let _c = core::intrinsics::unchecked_mul(a, b);
let _x = core::intrinsics::unchecked_div(a, b);
let _y = core::intrinsics::unchecked_rem(a, b);
let _i = core::intrinsics::unchecked_shl(a, b);
let _j = core::intrinsics::unchecked_shr(a, b);
}
// EMIT_MIR lower_intrinsics.size_of.LowerIntrinsics.diff
pub fn size_of<T>() -> usize {
// CHECK-LABEL: fn size_of(
// CHECK: {{_.*}} = SizeOf(T);
core::intrinsics::size_of::<T>()
}
// EMIT_MIR lower_intrinsics.align_of.LowerIntrinsics.diff
pub fn align_of<T>() -> usize {
// CHECK-LABEL: fn align_of(
// CHECK: {{_.*}} = AlignOf(T);
core::intrinsics::min_align_of::<T>()
}
// EMIT_MIR lower_intrinsics.forget.LowerIntrinsics.diff
pub fn forget<T>(t: T) {
// CHECK-LABEL: fn forget(
// CHECK-NOT: Drop(
// CHECK: return;
// CHECK-NOT: Drop(
core::intrinsics::forget(t)
}
// EMIT_MIR lower_intrinsics.unreachable.LowerIntrinsics.diff
pub fn unreachable() -> ! {
// CHECK-LABEL: fn unreachable(
// CHECK: unreachable;
unsafe { core::intrinsics::unreachable() };
}
// EMIT_MIR lower_intrinsics.non_const.LowerIntrinsics.diff
pub fn non_const<T>() -> usize {
// CHECK-LABEL: fn non_const(
// CHECK: SizeOf(T);
// Check that lowering works with non-const operand as a func.
let size_of_t = core::intrinsics::size_of::<T>;
size_of_t()
}
// EMIT_MIR lower_intrinsics.transmute_inhabited.LowerIntrinsics.diff
pub fn transmute_inhabited(c: std::cmp::Ordering) -> i8 {
// CHECK-LABEL: fn transmute_inhabited(
// CHECK: {{_.*}} = {{.*}} as i8 (Transmute);
unsafe { std::mem::transmute(c) }
}
// EMIT_MIR lower_intrinsics.transmute_uninhabited.LowerIntrinsics.diff
pub unsafe fn transmute_uninhabited(u: ()) -> Never {
// CHECK-LABEL: fn transmute_uninhabited(
// CHECK: {{_.*}} = {{.*}} as Never (Transmute);
// CHECK: unreachable;
unsafe { std::mem::transmute::<(), Never>(u) }
}
// EMIT_MIR lower_intrinsics.transmute_ref_dst.LowerIntrinsics.diff
pub unsafe fn transmute_ref_dst<T: ?Sized>(u: &T) -> *const T {
// CHECK-LABEL: fn transmute_ref_dst(
// CHECK: {{_.*}} = {{.*}} as *const T (Transmute);
unsafe { std::mem::transmute(u) }
}
// EMIT_MIR lower_intrinsics.transmute_to_ref_uninhabited.LowerIntrinsics.diff
pub unsafe fn transmute_to_ref_uninhabited() -> ! {
// CHECK-LABEL: fn transmute_to_ref_uninhabited(
// CHECK: {{_.*}} = {{.*}} as &Never (Transmute);
// CHECK: unreachable;
let x: &Never = std::mem::transmute(1usize);
match *x {}
}
// EMIT_MIR lower_intrinsics.transmute_to_mut_uninhabited.LowerIntrinsics.diff
pub unsafe fn transmute_to_mut_uninhabited() -> ! {
// CHECK-LABEL: fn transmute_to_mut_uninhabited(
// CHECK: {{_.*}} = {{.*}} as &mut Never (Transmute);
// CHECK: unreachable;
let x: &mut Never = std::mem::transmute(1usize);
match *x {}
}
// EMIT_MIR lower_intrinsics.transmute_to_box_uninhabited.LowerIntrinsics.diff
pub unsafe fn transmute_to_box_uninhabited() -> ! {
// CHECK-LABEL: fn transmute_to_box_uninhabited(
// CHECK: {{_.*}} = {{.*}} as std::boxed::Box<Never> (Transmute);
// CHECK: unreachable;
let x: Box<Never> = std::mem::transmute(1usize);
match *x {}
}
pub enum E {
A,
B,
C,
}
// EMIT_MIR lower_intrinsics.discriminant.LowerIntrinsics.diff
pub fn discriminant<T>(t: T) {
// CHECK-LABEL: fn discriminant(
// CHECK: {{_.*}} = discriminant(
// CHECK: {{_.*}} = discriminant(
// CHECK: {{_.*}} = discriminant(
// CHECK: {{_.*}} = discriminant(
core::intrinsics::discriminant_value(&t);
core::intrinsics::discriminant_value(&0);
core::intrinsics::discriminant_value(&());
core::intrinsics::discriminant_value(&E::B);
}
extern "rust-intrinsic" {
// Cannot use `std::intrinsics::copy_nonoverlapping` as that is a wrapper function
#[rustc_nounwind]
fn copy_nonoverlapping<T>(src: *const T, dst: *mut T, count: usize);
}
// EMIT_MIR lower_intrinsics.f_copy_nonoverlapping.LowerIntrinsics.diff
pub fn f_copy_nonoverlapping() {
// CHECK-LABEL: fn f_copy_nonoverlapping(
// CHECK: copy_nonoverlapping({{.*}});
let src = ();
let mut dst = ();
unsafe {
copy_nonoverlapping(&src as *const _ as *const i32, &mut dst as *mut _ as *mut i32, 0);
}
}
// EMIT_MIR lower_intrinsics.assume.LowerIntrinsics.diff
pub fn assume() {
// CHECK-LABEL: fn assume(
// CHECK: assume({{.*}});
unsafe {
std::intrinsics::assume(true);
}
}
// EMIT_MIR lower_intrinsics.with_overflow.LowerIntrinsics.diff
pub fn with_overflow(a: i32, b: i32) {
// CHECK-LABEL: fn with_overflow(
// CHECK: CheckedAdd(
// CHECK: CheckedSub(
// CHECK: CheckedMul(
let _x = core::intrinsics::add_with_overflow(a, b);
let _y = core::intrinsics::sub_with_overflow(a, b);
let _z = core::intrinsics::mul_with_overflow(a, b);
}
// EMIT_MIR lower_intrinsics.read_via_copy_primitive.LowerIntrinsics.diff
pub fn read_via_copy_primitive(r: &i32) -> i32 {
// CHECK-LABEL: fn read_via_copy_primitive(
// CHECK: [[tmp:_.*]] = &raw const (*_1);
// CHECK: _0 = (*[[tmp]]);
// CHECK: return;
unsafe { core::intrinsics::read_via_copy(r) }
}
// EMIT_MIR lower_intrinsics.read_via_copy_uninhabited.LowerIntrinsics.diff
pub fn read_via_copy_uninhabited(r: &Never) -> Never {
// CHECK-LABEL: fn read_via_copy_uninhabited(
// CHECK: [[tmp:_.*]] = &raw const (*_1);
// CHECK: _0 = (*[[tmp]]);
// CHECK: unreachable;
unsafe { core::intrinsics::read_via_copy(r) }
}
// EMIT_MIR lower_intrinsics.write_via_move_string.LowerIntrinsics.diff
pub fn write_via_move_string(r: &mut String, v: String) {
// CHECK-LABEL: fn write_via_move_string(
// CHECK: [[ptr:_.*]] = &raw mut (*_1);
// CHECK: [[tmp:_.*]] = move _2;
// CHECK: (*[[ptr]]) = move [[tmp]];
// CHECK: return;
unsafe { core::intrinsics::write_via_move(r, v) }
}
pub enum Never {}
// EMIT_MIR lower_intrinsics.ptr_offset.LowerIntrinsics.diff
pub unsafe fn ptr_offset(p: *const i32, d: isize) -> *const i32 {
// CHECK-LABEL: fn ptr_offset(
// CHECK: _0 = Offset(
core::intrinsics::offset(p, d)
}
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