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// MIR for `slice_iter_mut_next_back` after PreCodegen
fn slice_iter_mut_next_back(_1: &mut std::slice::IterMut<'_, T>) -> Option<&mut T> {
debug it => _1;
let mut _0: std::option::Option<&mut T>;
scope 1 (inlined <std::slice::IterMut<'_, T> as DoubleEndedIterator>::next_back) {
let mut _2: *mut T;
let mut _7: bool;
let mut _8: *mut T;
let mut _21: &mut T;
scope 2 {
let _3: std::ptr::NonNull<T>;
let _9: usize;
scope 3 {
}
scope 4 {
scope 7 (inlined <NonNull<T> as PartialEq>::eq) {
let mut _4: std::ptr::NonNull<T>;
let mut _5: *mut T;
let mut _6: *mut T;
scope 8 (inlined NonNull::<T>::as_ptr) {
}
scope 9 (inlined NonNull::<T>::as_ptr) {
}
}
}
scope 5 (inlined std::ptr::mut_ptr::<impl *mut T>::addr) {
scope 6 (inlined std::ptr::mut_ptr::<impl *mut T>::cast::<()>) {
}
}
}
scope 10 (inlined std::slice::IterMut::<'_, T>::next_back_unchecked) {
let mut _15: std::ptr::NonNull<T>;
scope 11 (inlined std::slice::IterMut::<'_, T>::pre_dec_end) {
let mut _10: *mut *mut T;
let mut _11: *mut std::ptr::NonNull<T>;
let mut _12: std::ptr::NonNull<T>;
let mut _16: *mut *mut T;
let mut _17: *mut usize;
let mut _18: usize;
let mut _19: usize;
scope 12 {
scope 13 {
}
scope 14 {
scope 17 (inlined NonNull::<T>::sub) {
scope 18 (inlined #[track_caller] core::num::<impl isize>::unchecked_neg) {
scope 19 (inlined core::ub_checks::check_language_ub) {
scope 20 (inlined core::ub_checks::check_language_ub::runtime) {
}
}
}
scope 21 (inlined NonNull::<T>::offset) {
let mut _13: *const T;
let mut _14: *const T;
scope 22 (inlined NonNull::<T>::as_ptr) {
}
}
}
}
scope 15 (inlined std::ptr::mut_ptr::<impl *mut *mut T>::cast::<usize>) {
}
scope 16 (inlined std::ptr::mut_ptr::<impl *mut *mut T>::cast::<NonNull<T>>) {
}
}
}
scope 23 (inlined NonNull::<T>::as_mut::<'_>) {
let mut _20: *mut T;
scope 24 (inlined NonNull::<T>::as_ptr) {
}
}
}
}
bb0: {
StorageLive(_9);
StorageLive(_8);
StorageLive(_3);
StorageLive(_2);
StorageLive(_21);
StorageLive(_7);
switchInt(const <T as std::mem::SizedTypeProperties>::IS_ZST) -> [0: bb1, otherwise: bb2];
}
bb1: {
_2 = copy ((*_1).1: *mut T);
_3 = copy _2 as std::ptr::NonNull<T> (Transmute);
StorageLive(_5);
StorageLive(_4);
_4 = copy ((*_1).0: std::ptr::NonNull<T>);
_5 = copy _4 as *mut T (Transmute);
StorageDead(_4);
StorageLive(_6);
_6 = copy _3 as *mut T (Transmute);
_7 = Eq(copy _5, copy _6);
StorageDead(_6);
StorageDead(_5);
goto -> bb3;
}
bb2: {
_8 = copy ((*_1).1: *mut T);
_9 = copy _8 as usize (Transmute);
_7 = Eq(copy _9, const 0_usize);
goto -> bb3;
}
bb3: {
switchInt(move _7) -> [0: bb4, otherwise: bb10];
}
bb4: {
StorageLive(_15);
StorageLive(_17);
StorageLive(_11);
StorageLive(_12);
switchInt(const <T as std::mem::SizedTypeProperties>::IS_ZST) -> [0: bb5, otherwise: bb8];
}
bb5: {
StorageLive(_10);
_10 = &raw mut ((*_1).1: *mut T);
_11 = copy _10 as *mut std::ptr::NonNull<T> (PtrToPtr);
StorageDead(_10);
_12 = copy (*_11);
switchInt(const <T as std::mem::SizedTypeProperties>::IS_ZST) -> [0: bb6, otherwise: bb7];
}
bb6: {
StorageLive(_14);
StorageLive(_13);
_13 = copy _12 as *const T (Transmute);
_14 = Offset(copy _13, const -1_isize);
StorageDead(_13);
_12 = NonNull::<T> { pointer: copy _14 };
StorageDead(_14);
goto -> bb7;
}
bb7: {
(*_11) = move _12;
_15 = copy (*_11);
goto -> bb9;
}
bb8: {
StorageLive(_16);
_16 = &raw mut ((*_1).1: *mut T);
_17 = copy _16 as *mut usize (PtrToPtr);
StorageDead(_16);
StorageLive(_19);
StorageLive(_18);
_18 = copy (*_17);
_19 = SubUnchecked(move _18, const 1_usize);
StorageDead(_18);
(*_17) = move _19;
StorageDead(_19);
_15 = copy ((*_1).0: std::ptr::NonNull<T>);
goto -> bb9;
}
bb9: {
StorageDead(_12);
StorageDead(_11);
StorageDead(_17);
StorageLive(_20);
_20 = copy _15 as *mut T (Transmute);
_21 = &mut (*_20);
StorageDead(_20);
StorageDead(_15);
_0 = Option::<&mut T>::Some(copy _21);
goto -> bb11;
}
bb10: {
_0 = const {transmute(0x0000000000000000): Option<&mut T>};
goto -> bb11;
}
bb11: {
StorageDead(_7);
StorageDead(_21);
StorageDead(_2);
StorageDead(_3);
StorageDead(_8);
StorageDead(_9);
return;
}
}
|
