Auto merge of #136771 - scottmcm:poke-slice-iter-next, r=joboet
Simplify `slice::Iter::next` enough that it inlines Inspired by this zulip conversation: <https://rust-lang.zulipchat.com/#narrow/channel/189540-t-compiler.2Fwg-mir-opt/topic/Feedback.20on.20a.20MIR.20optimization.20idea/near/498579990> ~~Draft for now because it needs #136735 to get the codegen tests to pass.~~
This commit is contained in:
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commit
f04bbc60f8
@ -154,16 +154,39 @@ macro_rules! iterator {
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#[inline]
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fn next(&mut self) -> Option<$elem> {
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// could be implemented with slices, but this avoids bounds checks
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// intentionally not using the helpers because this is
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// one of the most mono'd things in the library.
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// SAFETY: The call to `next_unchecked` is
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// safe since we check if the iterator is empty first.
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let ptr = self.ptr;
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let end_or_len = self.end_or_len;
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// SAFETY: See inner comments. (For some reason having multiple
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// block breaks inlining this -- if you can fix that please do!)
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unsafe {
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if is_empty!(self) {
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None
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if T::IS_ZST {
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let len = end_or_len.addr();
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if len == 0 {
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return None;
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}
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// SAFETY: just checked that it's not zero, so subtracting one
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// cannot wrap. (Ideally this would be `checked_sub`, which
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// does the same thing internally, but as of 2025-02 that
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// doesn't optimize quite as small in MIR.)
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self.end_or_len = without_provenance_mut(len.unchecked_sub(1));
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} else {
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Some(self.next_unchecked())
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// SAFETY: by type invariant, the `end_or_len` field is always
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// non-null for a non-ZST pointee. (This transmute ensures we
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// get `!nonnull` metadata on the load of the field.)
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if ptr == crate::intrinsics::transmute::<$ptr, NonNull<T>>(end_or_len) {
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return None;
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}
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// SAFETY: since it's not empty, per the check above, moving
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// forward one keeps us inside the slice, and this is valid.
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self.ptr = ptr.add(1);
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}
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// SAFETY: Now that we know it wasn't empty and we've moved past
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// the first one (to avoid giving a duplicate `&mut` next time),
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// we can give out a reference to it.
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Some({ptr}.$into_ref())
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}
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}
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@ -14,11 +14,11 @@
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// CHECK-LABEL: @slice_iter_next(
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#[no_mangle]
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pub fn slice_iter_next<'a>(it: &mut std::slice::Iter<'a, u32>) -> Option<&'a u32> {
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// CHECK: %[[ENDP:.+]] = getelementptr inbounds{{( nuw)?}} i8, ptr %it, {{i32 4|i64 8}}
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// CHECK: %[[END:.+]] = load ptr, ptr %[[ENDP]]
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// CHECK: %[[START:.+]] = load ptr, ptr %it,
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// CHECK-SAME: !nonnull
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// CHECK-SAME: !noundef
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// CHECK: %[[START:.+]] = load ptr, ptr %it,
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// CHECK: %[[ENDP:.+]] = getelementptr inbounds{{( nuw)?}} i8, ptr %it, {{i32 4|i64 8}}
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// CHECK: %[[END:.+]] = load ptr, ptr %[[ENDP]]
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// CHECK-SAME: !nonnull
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// CHECK-SAME: !noundef
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// CHECK: icmp eq ptr %[[START]], %[[END]]
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@ -4,28 +4,30 @@ fn enumerated_loop(_1: &[T], _2: impl Fn(usize, &T)) -> () {
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debug slice => _1;
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debug f => _2;
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let mut _0: ();
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let mut _11: std::slice::Iter<'_, T>;
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let mut _12: std::iter::Enumerate<std::slice::Iter<'_, T>>;
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let mut _13: std::iter::Enumerate<std::slice::Iter<'_, T>>;
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let mut _21: std::option::Option<(usize, &T)>;
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let mut _24: &impl Fn(usize, &T);
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let mut _25: (usize, &T);
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let _26: ();
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let mut _11: std::ptr::NonNull<T>;
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let mut _12: *const T;
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let mut _13: usize;
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let mut _32: std::option::Option<(usize, &T)>;
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let mut _35: &impl Fn(usize, &T);
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let mut _36: (usize, &T);
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let _37: ();
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scope 1 {
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debug iter => _13;
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let _22: usize;
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let _23: &T;
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debug (((iter: Enumerate<std::slice::Iter<'_, T>>).0: std::slice::Iter<'_, T>).0: std::ptr::NonNull<T>) => _11;
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debug (((iter: Enumerate<std::slice::Iter<'_, T>>).0: std::slice::Iter<'_, T>).1: *const T) => _12;
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debug (((iter: Enumerate<std::slice::Iter<'_, T>>).0: std::slice::Iter<'_, T>).2: std::marker::PhantomData<&T>) => const ZeroSized: PhantomData<&T>;
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debug ((iter: Enumerate<std::slice::Iter<'_, T>>).1: usize) => _13;
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let _33: usize;
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let _34: &T;
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scope 2 {
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debug i => _22;
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debug x => _23;
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debug i => _33;
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debug x => _34;
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}
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scope 19 (inlined <Enumerate<std::slice::Iter<'_, T>> as Iterator>::next) {
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let mut _14: &mut std::slice::Iter<'_, T>;
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let mut _15: std::option::Option<&T>;
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let mut _19: (usize, bool);
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let mut _20: (usize, &T);
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let mut _27: std::option::Option<&T>;
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let mut _30: (usize, bool);
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let mut _31: (usize, &T);
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scope 20 {
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let _18: usize;
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let _29: usize;
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scope 25 {
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}
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}
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@ -40,11 +42,59 @@ fn enumerated_loop(_1: &[T], _2: impl Fn(usize, &T)) -> () {
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}
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}
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scope 26 (inlined <Option<&T> as Try>::branch) {
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let mut _16: isize;
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let _17: &T;
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let _28: &T;
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scope 27 {
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}
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}
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scope 29 (inlined <std::slice::Iter<'_, T> as Iterator>::next) {
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let _14: std::ptr::NonNull<T>;
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let _16: std::ptr::NonNull<T>;
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let mut _19: bool;
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let mut _22: std::ptr::NonNull<T>;
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let mut _24: usize;
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let _26: &T;
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scope 30 {
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let _15: *const T;
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scope 31 {
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let _23: usize;
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scope 32 {
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scope 35 (inlined core::num::<impl usize>::unchecked_sub) {
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scope 36 (inlined core::ub_checks::check_language_ub) {
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scope 37 (inlined core::ub_checks::check_language_ub::runtime) {
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}
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}
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}
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scope 38 (inlined without_provenance_mut::<T>) {
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}
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}
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scope 33 (inlined std::ptr::const_ptr::<impl *const T>::addr) {
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scope 34 (inlined std::ptr::const_ptr::<impl *const T>::cast::<()>) {
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}
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}
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scope 39 (inlined <NonNull<T> as PartialEq>::eq) {
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let mut _17: *mut T;
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let mut _18: *mut T;
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scope 40 (inlined NonNull::<T>::as_ptr) {
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}
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scope 41 (inlined NonNull::<T>::as_ptr) {
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}
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}
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scope 42 (inlined NonNull::<T>::add) {
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let mut _20: *const T;
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let mut _21: *const T;
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scope 43 (inlined NonNull::<T>::as_ptr) {
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}
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}
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scope 44 (inlined NonNull::<T>::as_ref::<'_>) {
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let _25: *const T;
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scope 45 (inlined NonNull::<T>::as_ptr) {
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}
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scope 46 (inlined std::ptr::mut_ptr::<impl *mut T>::cast_const) {
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}
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}
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}
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}
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}
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}
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}
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scope 3 (inlined core::slice::<impl [T]>::iter) {
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@ -89,9 +139,7 @@ fn enumerated_loop(_1: &[T], _2: impl Fn(usize, &T)) -> () {
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}
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bb0: {
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StorageLive(_11);
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StorageLive(_3);
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StorageLive(_6);
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StorageLive(_4);
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_3 = PtrMetadata(copy _1);
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_4 = &raw const (*_1);
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@ -120,86 +168,150 @@ fn enumerated_loop(_1: &[T], _2: impl Fn(usize, &T)) -> () {
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}
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bb3: {
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StorageLive(_10);
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_10 = copy _9;
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_11 = std::slice::Iter::<'_, T> { ptr: copy _6, end_or_len: move _10, _marker: const ZeroSized: PhantomData<&T> };
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StorageDead(_10);
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StorageDead(_9);
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StorageDead(_4);
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StorageDead(_6);
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StorageDead(_3);
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_12 = Enumerate::<std::slice::Iter<'_, T>> { iter: copy _11, count: const 0_usize };
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StorageDead(_11);
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StorageLive(_11);
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StorageLive(_12);
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StorageLive(_13);
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_13 = copy _12;
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_11 = copy _6;
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_12 = copy _10;
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_13 = const 0_usize;
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goto -> bb4;
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}
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bb4: {
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StorageLive(_21);
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StorageLive(_18);
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StorageLive(_19);
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StorageLive(_15);
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StorageLive(_32);
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StorageLive(_29);
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StorageLive(_30);
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StorageLive(_27);
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StorageLive(_14);
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_14 = &mut (_13.0: std::slice::Iter<'_, T>);
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_15 = <std::slice::Iter<'_, T> as Iterator>::next(move _14) -> [return: bb5, unwind unreachable];
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StorageLive(_15);
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StorageLive(_23);
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StorageLive(_24);
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StorageLive(_16);
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StorageLive(_26);
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_14 = copy _11;
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_15 = copy _12;
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switchInt(const <T as std::mem::SizedTypeProperties>::IS_ZST) -> [0: bb5, otherwise: bb8];
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}
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bb5: {
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StorageDead(_14);
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StorageLive(_16);
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_16 = discriminant(_15);
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switchInt(move _16) -> [0: bb6, 1: bb8, otherwise: bb11];
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StorageLive(_19);
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_16 = copy _15 as std::ptr::NonNull<T> (Transmute);
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StorageLive(_17);
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_17 = copy _14 as *mut T (Transmute);
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StorageLive(_18);
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_18 = copy _16 as *mut T (Transmute);
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_19 = Eq(move _17, move _18);
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StorageDead(_18);
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StorageDead(_17);
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switchInt(move _19) -> [0: bb6, otherwise: bb7];
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}
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bb6: {
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StorageDead(_16);
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StorageDead(_15);
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StorageDead(_19);
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StorageDead(_18);
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StorageLive(_22);
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StorageLive(_21);
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StorageLive(_20);
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_20 = copy _14 as *const T (Transmute);
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_21 = Offset(move _20, const 1_usize);
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StorageDead(_20);
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_22 = NonNull::<T> { pointer: move _21 };
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StorageDead(_21);
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StorageDead(_13);
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drop(_2) -> [return: bb7, unwind unreachable];
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_11 = move _22;
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StorageDead(_22);
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goto -> bb13;
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}
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bb7: {
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return;
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StorageDead(_19);
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StorageDead(_26);
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StorageDead(_16);
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StorageDead(_24);
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StorageDead(_23);
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StorageDead(_15);
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StorageDead(_14);
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goto -> bb10;
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}
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bb8: {
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_17 = move ((_15 as Some).0: &T);
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StorageDead(_16);
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StorageDead(_15);
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_18 = copy (_13.1: usize);
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_19 = AddWithOverflow(copy (_13.1: usize), const 1_usize);
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assert(!move (_19.1: bool), "attempt to compute `{} + {}`, which would overflow", copy (_13.1: usize), const 1_usize) -> [success: bb9, unwind unreachable];
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_23 = copy _15 as usize (Transmute);
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switchInt(copy _23) -> [0: bb9, otherwise: bb12];
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}
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bb9: {
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(_13.1: usize) = move (_19.0: usize);
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StorageLive(_20);
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_20 = (copy _18, copy _17);
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_21 = Option::<(usize, &T)>::Some(move _20);
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StorageDead(_20);
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StorageDead(_19);
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StorageDead(_18);
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_22 = copy (((_21 as Some).0: (usize, &T)).0: usize);
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_23 = copy (((_21 as Some).0: (usize, &T)).1: &T);
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StorageLive(_24);
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_24 = &_2;
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StorageLive(_25);
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_25 = (copy _22, copy _23);
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_26 = <impl Fn(usize, &T) as Fn<(usize, &T)>>::call(move _24, move _25) -> [return: bb10, unwind unreachable];
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StorageDead(_26);
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StorageDead(_16);
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StorageDead(_24);
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StorageDead(_23);
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StorageDead(_15);
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StorageDead(_14);
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goto -> bb10;
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}
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bb10: {
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StorageDead(_25);
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StorageDead(_24);
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StorageDead(_21);
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goto -> bb4;
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StorageDead(_27);
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StorageDead(_30);
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StorageDead(_29);
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StorageDead(_32);
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StorageDead(_11);
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StorageDead(_12);
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StorageDead(_13);
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drop(_2) -> [return: bb11, unwind unreachable];
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}
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bb11: {
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unreachable;
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return;
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}
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bb12: {
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_24 = SubUnchecked(copy _23, const 1_usize);
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_12 = copy _24 as *const T (Transmute);
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goto -> bb13;
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}
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bb13: {
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StorageLive(_25);
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_25 = copy _14 as *const T (Transmute);
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_26 = &(*_25);
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StorageDead(_25);
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_27 = Option::<&T>::Some(copy _26);
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StorageDead(_26);
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StorageDead(_16);
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StorageDead(_24);
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StorageDead(_23);
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StorageDead(_15);
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StorageDead(_14);
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_28 = move ((_27 as Some).0: &T);
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StorageDead(_27);
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_29 = copy _13;
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_30 = AddWithOverflow(copy _13, const 1_usize);
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assert(!move (_30.1: bool), "attempt to compute `{} + {}`, which would overflow", copy _13, const 1_usize) -> [success: bb14, unwind unreachable];
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}
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bb14: {
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_13 = move (_30.0: usize);
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StorageLive(_31);
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_31 = (copy _29, copy _28);
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_32 = Option::<(usize, &T)>::Some(move _31);
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StorageDead(_31);
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StorageDead(_30);
|
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StorageDead(_29);
|
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_33 = copy (((_32 as Some).0: (usize, &T)).0: usize);
|
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_34 = copy (((_32 as Some).0: (usize, &T)).1: &T);
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StorageLive(_35);
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_35 = &_2;
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StorageLive(_36);
|
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_36 = (copy _33, copy _34);
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_37 = <impl Fn(usize, &T) as Fn<(usize, &T)>>::call(move _35, move _36) -> [return: bb15, unwind unreachable];
|
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}
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|
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bb15: {
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StorageDead(_36);
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StorageDead(_35);
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StorageDead(_32);
|
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goto -> bb4;
|
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}
|
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}
|
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|
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@ -4,19 +4,68 @@ fn forward_loop(_1: &[T], _2: impl Fn(&T)) -> () {
|
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debug slice => _1;
|
||||
debug f => _2;
|
||||
let mut _0: ();
|
||||
let mut _11: std::slice::Iter<'_, T>;
|
||||
let mut _12: std::slice::Iter<'_, T>;
|
||||
let mut _13: &mut std::slice::Iter<'_, T>;
|
||||
let mut _14: std::option::Option<&T>;
|
||||
let mut _15: isize;
|
||||
let mut _17: &impl Fn(&T);
|
||||
let mut _18: (&T,);
|
||||
let _19: ();
|
||||
let mut _11: std::ptr::NonNull<T>;
|
||||
let mut _12: *const T;
|
||||
let mut _26: std::option::Option<&T>;
|
||||
let mut _28: &impl Fn(&T);
|
||||
let mut _29: (&T,);
|
||||
let _30: ();
|
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scope 1 {
|
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debug iter => _12;
|
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let _16: &T;
|
||||
debug ((iter: std::slice::Iter<'_, T>).0: std::ptr::NonNull<T>) => _11;
|
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debug ((iter: std::slice::Iter<'_, T>).1: *const T) => _12;
|
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debug ((iter: std::slice::Iter<'_, T>).2: std::marker::PhantomData<&T>) => const ZeroSized: PhantomData<&T>;
|
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let _27: &T;
|
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scope 2 {
|
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debug x => _16;
|
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debug x => _27;
|
||||
}
|
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scope 17 (inlined <std::slice::Iter<'_, T> as Iterator>::next) {
|
||||
let _13: std::ptr::NonNull<T>;
|
||||
let _15: std::ptr::NonNull<T>;
|
||||
let mut _18: bool;
|
||||
let mut _21: std::ptr::NonNull<T>;
|
||||
let mut _23: usize;
|
||||
let _25: &T;
|
||||
scope 18 {
|
||||
let _14: *const T;
|
||||
scope 19 {
|
||||
let _22: usize;
|
||||
scope 20 {
|
||||
scope 23 (inlined core::num::<impl usize>::unchecked_sub) {
|
||||
scope 24 (inlined core::ub_checks::check_language_ub) {
|
||||
scope 25 (inlined core::ub_checks::check_language_ub::runtime) {
|
||||
}
|
||||
}
|
||||
}
|
||||
scope 26 (inlined without_provenance_mut::<T>) {
|
||||
}
|
||||
}
|
||||
scope 21 (inlined std::ptr::const_ptr::<impl *const T>::addr) {
|
||||
scope 22 (inlined std::ptr::const_ptr::<impl *const T>::cast::<()>) {
|
||||
}
|
||||
}
|
||||
scope 27 (inlined <NonNull<T> as PartialEq>::eq) {
|
||||
let mut _16: *mut T;
|
||||
let mut _17: *mut T;
|
||||
scope 28 (inlined NonNull::<T>::as_ptr) {
|
||||
}
|
||||
scope 29 (inlined NonNull::<T>::as_ptr) {
|
||||
}
|
||||
}
|
||||
scope 30 (inlined NonNull::<T>::add) {
|
||||
let mut _19: *const T;
|
||||
let mut _20: *const T;
|
||||
scope 31 (inlined NonNull::<T>::as_ptr) {
|
||||
}
|
||||
}
|
||||
scope 32 (inlined NonNull::<T>::as_ref::<'_>) {
|
||||
let _24: *const T;
|
||||
scope 33 (inlined NonNull::<T>::as_ptr) {
|
||||
}
|
||||
scope 34 (inlined std::ptr::mut_ptr::<impl *mut T>::cast_const) {
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
scope 3 (inlined core::slice::<impl [T]>::iter) {
|
||||
@ -58,7 +107,6 @@ fn forward_loop(_1: &[T], _2: impl Fn(&T)) -> () {
|
||||
|
||||
bb0: {
|
||||
StorageLive(_3);
|
||||
StorageLive(_6);
|
||||
StorageLive(_4);
|
||||
_3 = PtrMetadata(copy _1);
|
||||
_4 = &raw const (*_1);
|
||||
@ -87,57 +135,125 @@ fn forward_loop(_1: &[T], _2: impl Fn(&T)) -> () {
|
||||
}
|
||||
|
||||
bb3: {
|
||||
StorageLive(_10);
|
||||
_10 = copy _9;
|
||||
_11 = std::slice::Iter::<'_, T> { ptr: copy _6, end_or_len: move _10, _marker: const ZeroSized: PhantomData<&T> };
|
||||
StorageDead(_10);
|
||||
StorageDead(_9);
|
||||
StorageDead(_4);
|
||||
StorageDead(_6);
|
||||
StorageDead(_3);
|
||||
StorageLive(_11);
|
||||
StorageLive(_12);
|
||||
_12 = copy _11;
|
||||
_11 = copy _6;
|
||||
_12 = copy _10;
|
||||
goto -> bb4;
|
||||
}
|
||||
|
||||
bb4: {
|
||||
StorageLive(_26);
|
||||
StorageLive(_13);
|
||||
StorageLive(_14);
|
||||
_13 = &mut _12;
|
||||
_14 = <std::slice::Iter<'_, T> as Iterator>::next(move _13) -> [return: bb5, unwind unreachable];
|
||||
StorageLive(_22);
|
||||
StorageLive(_23);
|
||||
StorageLive(_15);
|
||||
StorageLive(_25);
|
||||
_13 = copy _11;
|
||||
_14 = copy _12;
|
||||
switchInt(const <T as std::mem::SizedTypeProperties>::IS_ZST) -> [0: bb5, otherwise: bb8];
|
||||
}
|
||||
|
||||
bb5: {
|
||||
_15 = discriminant(_14);
|
||||
switchInt(move _15) -> [0: bb6, 1: bb8, otherwise: bb10];
|
||||
StorageLive(_18);
|
||||
_15 = copy _14 as std::ptr::NonNull<T> (Transmute);
|
||||
StorageLive(_16);
|
||||
_16 = copy _13 as *mut T (Transmute);
|
||||
StorageLive(_17);
|
||||
_17 = copy _15 as *mut T (Transmute);
|
||||
_18 = Eq(move _16, move _17);
|
||||
StorageDead(_17);
|
||||
StorageDead(_16);
|
||||
switchInt(move _18) -> [0: bb6, otherwise: bb7];
|
||||
}
|
||||
|
||||
bb6: {
|
||||
StorageDead(_14);
|
||||
StorageDead(_12);
|
||||
drop(_2) -> [return: bb7, unwind unreachable];
|
||||
StorageDead(_18);
|
||||
StorageLive(_21);
|
||||
StorageLive(_20);
|
||||
StorageLive(_19);
|
||||
_19 = copy _13 as *const T (Transmute);
|
||||
_20 = Offset(move _19, const 1_usize);
|
||||
StorageDead(_19);
|
||||
_21 = NonNull::<T> { pointer: move _20 };
|
||||
StorageDead(_20);
|
||||
_11 = move _21;
|
||||
StorageDead(_21);
|
||||
goto -> bb13;
|
||||
}
|
||||
|
||||
bb7: {
|
||||
return;
|
||||
StorageDead(_18);
|
||||
StorageDead(_25);
|
||||
StorageDead(_15);
|
||||
StorageDead(_23);
|
||||
StorageDead(_22);
|
||||
StorageDead(_14);
|
||||
StorageDead(_13);
|
||||
goto -> bb10;
|
||||
}
|
||||
|
||||
bb8: {
|
||||
_16 = copy ((_14 as Some).0: &T);
|
||||
StorageLive(_17);
|
||||
_17 = &_2;
|
||||
StorageLive(_18);
|
||||
_18 = (copy _16,);
|
||||
_19 = <impl Fn(&T) as Fn<(&T,)>>::call(move _17, move _18) -> [return: bb9, unwind unreachable];
|
||||
_22 = copy _14 as usize (Transmute);
|
||||
switchInt(copy _22) -> [0: bb9, otherwise: bb12];
|
||||
}
|
||||
|
||||
bb9: {
|
||||
StorageDead(_18);
|
||||
StorageDead(_17);
|
||||
StorageDead(_25);
|
||||
StorageDead(_15);
|
||||
StorageDead(_23);
|
||||
StorageDead(_22);
|
||||
StorageDead(_14);
|
||||
goto -> bb4;
|
||||
StorageDead(_13);
|
||||
goto -> bb10;
|
||||
}
|
||||
|
||||
bb10: {
|
||||
unreachable;
|
||||
StorageDead(_26);
|
||||
StorageDead(_11);
|
||||
StorageDead(_12);
|
||||
drop(_2) -> [return: bb11, unwind unreachable];
|
||||
}
|
||||
|
||||
bb11: {
|
||||
return;
|
||||
}
|
||||
|
||||
bb12: {
|
||||
_23 = SubUnchecked(copy _22, const 1_usize);
|
||||
_12 = copy _23 as *const T (Transmute);
|
||||
goto -> bb13;
|
||||
}
|
||||
|
||||
bb13: {
|
||||
StorageLive(_24);
|
||||
_24 = copy _13 as *const T (Transmute);
|
||||
_25 = &(*_24);
|
||||
StorageDead(_24);
|
||||
_26 = Option::<&T>::Some(copy _25);
|
||||
StorageDead(_25);
|
||||
StorageDead(_15);
|
||||
StorageDead(_23);
|
||||
StorageDead(_22);
|
||||
StorageDead(_14);
|
||||
StorageDead(_13);
|
||||
_27 = copy ((_26 as Some).0: &T);
|
||||
StorageLive(_28);
|
||||
_28 = &_2;
|
||||
StorageLive(_29);
|
||||
_29 = (copy _27,);
|
||||
_30 = <impl Fn(&T) as Fn<(&T,)>>::call(move _28, move _29) -> [return: bb14, unwind unreachable];
|
||||
}
|
||||
|
||||
bb14: {
|
||||
StorageDead(_29);
|
||||
StorageDead(_28);
|
||||
StorageDead(_26);
|
||||
goto -> bb4;
|
||||
}
|
||||
}
|
||||
|
||||
@ -4,19 +4,68 @@ fn forward_loop(_1: &[T], _2: impl Fn(&T)) -> () {
|
||||
debug slice => _1;
|
||||
debug f => _2;
|
||||
let mut _0: ();
|
||||
let mut _11: std::slice::Iter<'_, T>;
|
||||
let mut _12: std::slice::Iter<'_, T>;
|
||||
let mut _13: &mut std::slice::Iter<'_, T>;
|
||||
let mut _14: std::option::Option<&T>;
|
||||
let mut _15: isize;
|
||||
let mut _17: &impl Fn(&T);
|
||||
let mut _18: (&T,);
|
||||
let _19: ();
|
||||
let mut _11: std::ptr::NonNull<T>;
|
||||
let mut _12: *const T;
|
||||
let mut _26: std::option::Option<&T>;
|
||||
let mut _28: &impl Fn(&T);
|
||||
let mut _29: (&T,);
|
||||
let _30: ();
|
||||
scope 1 {
|
||||
debug iter => _12;
|
||||
let _16: &T;
|
||||
debug ((iter: std::slice::Iter<'_, T>).0: std::ptr::NonNull<T>) => _11;
|
||||
debug ((iter: std::slice::Iter<'_, T>).1: *const T) => _12;
|
||||
debug ((iter: std::slice::Iter<'_, T>).2: std::marker::PhantomData<&T>) => const ZeroSized: PhantomData<&T>;
|
||||
let _27: &T;
|
||||
scope 2 {
|
||||
debug x => _16;
|
||||
debug x => _27;
|
||||
}
|
||||
scope 17 (inlined <std::slice::Iter<'_, T> as Iterator>::next) {
|
||||
let _13: std::ptr::NonNull<T>;
|
||||
let _15: std::ptr::NonNull<T>;
|
||||
let mut _18: bool;
|
||||
let mut _21: std::ptr::NonNull<T>;
|
||||
let mut _23: usize;
|
||||
let _25: &T;
|
||||
scope 18 {
|
||||
let _14: *const T;
|
||||
scope 19 {
|
||||
let _22: usize;
|
||||
scope 20 {
|
||||
scope 23 (inlined core::num::<impl usize>::unchecked_sub) {
|
||||
scope 24 (inlined core::ub_checks::check_language_ub) {
|
||||
scope 25 (inlined core::ub_checks::check_language_ub::runtime) {
|
||||
}
|
||||
}
|
||||
}
|
||||
scope 26 (inlined without_provenance_mut::<T>) {
|
||||
}
|
||||
}
|
||||
scope 21 (inlined std::ptr::const_ptr::<impl *const T>::addr) {
|
||||
scope 22 (inlined std::ptr::const_ptr::<impl *const T>::cast::<()>) {
|
||||
}
|
||||
}
|
||||
scope 27 (inlined <NonNull<T> as PartialEq>::eq) {
|
||||
let mut _16: *mut T;
|
||||
let mut _17: *mut T;
|
||||
scope 28 (inlined NonNull::<T>::as_ptr) {
|
||||
}
|
||||
scope 29 (inlined NonNull::<T>::as_ptr) {
|
||||
}
|
||||
}
|
||||
scope 30 (inlined NonNull::<T>::add) {
|
||||
let mut _19: *const T;
|
||||
let mut _20: *const T;
|
||||
scope 31 (inlined NonNull::<T>::as_ptr) {
|
||||
}
|
||||
}
|
||||
scope 32 (inlined NonNull::<T>::as_ref::<'_>) {
|
||||
let _24: *const T;
|
||||
scope 33 (inlined NonNull::<T>::as_ptr) {
|
||||
}
|
||||
scope 34 (inlined std::ptr::mut_ptr::<impl *mut T>::cast_const) {
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
scope 3 (inlined core::slice::<impl [T]>::iter) {
|
||||
@ -58,7 +107,6 @@ fn forward_loop(_1: &[T], _2: impl Fn(&T)) -> () {
|
||||
|
||||
bb0: {
|
||||
StorageLive(_3);
|
||||
StorageLive(_6);
|
||||
StorageLive(_4);
|
||||
_3 = PtrMetadata(copy _1);
|
||||
_4 = &raw const (*_1);
|
||||
@ -87,65 +135,133 @@ fn forward_loop(_1: &[T], _2: impl Fn(&T)) -> () {
|
||||
}
|
||||
|
||||
bb3: {
|
||||
StorageLive(_10);
|
||||
_10 = copy _9;
|
||||
_11 = std::slice::Iter::<'_, T> { ptr: copy _6, end_or_len: move _10, _marker: const ZeroSized: PhantomData<&T> };
|
||||
StorageDead(_10);
|
||||
StorageDead(_9);
|
||||
StorageDead(_4);
|
||||
StorageDead(_6);
|
||||
StorageDead(_3);
|
||||
StorageLive(_11);
|
||||
StorageLive(_12);
|
||||
_12 = copy _11;
|
||||
_11 = copy _6;
|
||||
_12 = copy _10;
|
||||
goto -> bb4;
|
||||
}
|
||||
|
||||
bb4: {
|
||||
StorageLive(_26);
|
||||
StorageLive(_13);
|
||||
StorageLive(_14);
|
||||
_13 = &mut _12;
|
||||
_14 = <std::slice::Iter<'_, T> as Iterator>::next(move _13) -> [return: bb5, unwind: bb11];
|
||||
StorageLive(_22);
|
||||
StorageLive(_23);
|
||||
StorageLive(_15);
|
||||
StorageLive(_25);
|
||||
_13 = copy _11;
|
||||
_14 = copy _12;
|
||||
switchInt(const <T as std::mem::SizedTypeProperties>::IS_ZST) -> [0: bb5, otherwise: bb8];
|
||||
}
|
||||
|
||||
bb5: {
|
||||
_15 = discriminant(_14);
|
||||
switchInt(move _15) -> [0: bb6, 1: bb8, otherwise: bb10];
|
||||
StorageLive(_18);
|
||||
_15 = copy _14 as std::ptr::NonNull<T> (Transmute);
|
||||
StorageLive(_16);
|
||||
_16 = copy _13 as *mut T (Transmute);
|
||||
StorageLive(_17);
|
||||
_17 = copy _15 as *mut T (Transmute);
|
||||
_18 = Eq(move _16, move _17);
|
||||
StorageDead(_17);
|
||||
StorageDead(_16);
|
||||
switchInt(move _18) -> [0: bb6, otherwise: bb7];
|
||||
}
|
||||
|
||||
bb6: {
|
||||
StorageDead(_14);
|
||||
StorageDead(_12);
|
||||
drop(_2) -> [return: bb7, unwind continue];
|
||||
StorageDead(_18);
|
||||
StorageLive(_21);
|
||||
StorageLive(_20);
|
||||
StorageLive(_19);
|
||||
_19 = copy _13 as *const T (Transmute);
|
||||
_20 = Offset(move _19, const 1_usize);
|
||||
StorageDead(_19);
|
||||
_21 = NonNull::<T> { pointer: move _20 };
|
||||
StorageDead(_20);
|
||||
_11 = move _21;
|
||||
StorageDead(_21);
|
||||
goto -> bb13;
|
||||
}
|
||||
|
||||
bb7: {
|
||||
return;
|
||||
StorageDead(_18);
|
||||
StorageDead(_25);
|
||||
StorageDead(_15);
|
||||
StorageDead(_23);
|
||||
StorageDead(_22);
|
||||
StorageDead(_14);
|
||||
StorageDead(_13);
|
||||
goto -> bb10;
|
||||
}
|
||||
|
||||
bb8: {
|
||||
_16 = copy ((_14 as Some).0: &T);
|
||||
StorageLive(_17);
|
||||
_17 = &_2;
|
||||
StorageLive(_18);
|
||||
_18 = (copy _16,);
|
||||
_19 = <impl Fn(&T) as Fn<(&T,)>>::call(move _17, move _18) -> [return: bb9, unwind: bb11];
|
||||
_22 = copy _14 as usize (Transmute);
|
||||
switchInt(copy _22) -> [0: bb9, otherwise: bb12];
|
||||
}
|
||||
|
||||
bb9: {
|
||||
StorageDead(_18);
|
||||
StorageDead(_17);
|
||||
StorageDead(_25);
|
||||
StorageDead(_15);
|
||||
StorageDead(_23);
|
||||
StorageDead(_22);
|
||||
StorageDead(_14);
|
||||
goto -> bb4;
|
||||
StorageDead(_13);
|
||||
goto -> bb10;
|
||||
}
|
||||
|
||||
bb10: {
|
||||
unreachable;
|
||||
StorageDead(_26);
|
||||
StorageDead(_11);
|
||||
StorageDead(_12);
|
||||
drop(_2) -> [return: bb11, unwind continue];
|
||||
}
|
||||
|
||||
bb11 (cleanup): {
|
||||
drop(_2) -> [return: bb12, unwind terminate(cleanup)];
|
||||
bb11: {
|
||||
return;
|
||||
}
|
||||
|
||||
bb12 (cleanup): {
|
||||
bb12: {
|
||||
_23 = SubUnchecked(copy _22, const 1_usize);
|
||||
_12 = copy _23 as *const T (Transmute);
|
||||
goto -> bb13;
|
||||
}
|
||||
|
||||
bb13: {
|
||||
StorageLive(_24);
|
||||
_24 = copy _13 as *const T (Transmute);
|
||||
_25 = &(*_24);
|
||||
StorageDead(_24);
|
||||
_26 = Option::<&T>::Some(copy _25);
|
||||
StorageDead(_25);
|
||||
StorageDead(_15);
|
||||
StorageDead(_23);
|
||||
StorageDead(_22);
|
||||
StorageDead(_14);
|
||||
StorageDead(_13);
|
||||
_27 = copy ((_26 as Some).0: &T);
|
||||
StorageLive(_28);
|
||||
_28 = &_2;
|
||||
StorageLive(_29);
|
||||
_29 = (copy _27,);
|
||||
_30 = <impl Fn(&T) as Fn<(&T,)>>::call(move _28, move _29) -> [return: bb14, unwind: bb15];
|
||||
}
|
||||
|
||||
bb14: {
|
||||
StorageDead(_29);
|
||||
StorageDead(_28);
|
||||
StorageDead(_26);
|
||||
goto -> bb4;
|
||||
}
|
||||
|
||||
bb15 (cleanup): {
|
||||
drop(_2) -> [return: bb16, unwind terminate(cleanup)];
|
||||
}
|
||||
|
||||
bb16 (cleanup): {
|
||||
resume;
|
||||
}
|
||||
}
|
||||
|
||||
@ -3,12 +3,134 @@
|
||||
fn slice_iter_next(_1: &mut std::slice::Iter<'_, T>) -> Option<&T> {
|
||||
debug it => _1;
|
||||
let mut _0: std::option::Option<&T>;
|
||||
scope 1 (inlined <std::slice::Iter<'_, T> as Iterator>::next) {
|
||||
let _2: std::ptr::NonNull<T>;
|
||||
let _4: std::ptr::NonNull<T>;
|
||||
let mut _7: bool;
|
||||
let mut _10: std::ptr::NonNull<T>;
|
||||
let mut _12: usize;
|
||||
let _14: &T;
|
||||
scope 2 {
|
||||
let _3: *const T;
|
||||
scope 3 {
|
||||
let _11: usize;
|
||||
scope 4 {
|
||||
scope 7 (inlined core::num::<impl usize>::unchecked_sub) {
|
||||
scope 8 (inlined core::ub_checks::check_language_ub) {
|
||||
scope 9 (inlined core::ub_checks::check_language_ub::runtime) {
|
||||
}
|
||||
}
|
||||
}
|
||||
scope 10 (inlined without_provenance_mut::<T>) {
|
||||
}
|
||||
}
|
||||
scope 5 (inlined std::ptr::const_ptr::<impl *const T>::addr) {
|
||||
scope 6 (inlined std::ptr::const_ptr::<impl *const T>::cast::<()>) {
|
||||
}
|
||||
}
|
||||
scope 11 (inlined <NonNull<T> as PartialEq>::eq) {
|
||||
let mut _5: *mut T;
|
||||
let mut _6: *mut T;
|
||||
scope 12 (inlined NonNull::<T>::as_ptr) {
|
||||
}
|
||||
scope 13 (inlined NonNull::<T>::as_ptr) {
|
||||
}
|
||||
}
|
||||
scope 14 (inlined NonNull::<T>::add) {
|
||||
let mut _8: *const T;
|
||||
let mut _9: *const T;
|
||||
scope 15 (inlined NonNull::<T>::as_ptr) {
|
||||
}
|
||||
}
|
||||
scope 16 (inlined NonNull::<T>::as_ref::<'_>) {
|
||||
let _13: *const T;
|
||||
scope 17 (inlined NonNull::<T>::as_ptr) {
|
||||
}
|
||||
scope 18 (inlined std::ptr::mut_ptr::<impl *mut T>::cast_const) {
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
bb0: {
|
||||
_0 = <std::slice::Iter<'_, T> as Iterator>::next(move _1) -> [return: bb1, unwind unreachable];
|
||||
StorageLive(_2);
|
||||
StorageLive(_3);
|
||||
StorageLive(_11);
|
||||
StorageLive(_12);
|
||||
StorageLive(_4);
|
||||
StorageLive(_14);
|
||||
_2 = copy ((*_1).0: std::ptr::NonNull<T>);
|
||||
_3 = copy ((*_1).1: *const T);
|
||||
switchInt(const <T as std::mem::SizedTypeProperties>::IS_ZST) -> [0: bb1, otherwise: bb4];
|
||||
}
|
||||
|
||||
bb1: {
|
||||
StorageLive(_7);
|
||||
_4 = copy _3 as std::ptr::NonNull<T> (Transmute);
|
||||
StorageLive(_5);
|
||||
_5 = copy _2 as *mut T (Transmute);
|
||||
StorageLive(_6);
|
||||
_6 = copy _4 as *mut T (Transmute);
|
||||
_7 = Eq(move _5, move _6);
|
||||
StorageDead(_6);
|
||||
StorageDead(_5);
|
||||
switchInt(move _7) -> [0: bb2, otherwise: bb3];
|
||||
}
|
||||
|
||||
bb2: {
|
||||
StorageDead(_7);
|
||||
StorageLive(_10);
|
||||
StorageLive(_9);
|
||||
StorageLive(_8);
|
||||
_8 = copy _2 as *const T (Transmute);
|
||||
_9 = Offset(move _8, const 1_usize);
|
||||
StorageDead(_8);
|
||||
_10 = NonNull::<T> { pointer: move _9 };
|
||||
StorageDead(_9);
|
||||
((*_1).0: std::ptr::NonNull<T>) = move _10;
|
||||
StorageDead(_10);
|
||||
goto -> bb7;
|
||||
}
|
||||
|
||||
bb3: {
|
||||
_0 = const {transmute(0x0000000000000000): Option<&T>};
|
||||
StorageDead(_7);
|
||||
goto -> bb8;
|
||||
}
|
||||
|
||||
bb4: {
|
||||
_11 = copy _3 as usize (Transmute);
|
||||
switchInt(copy _11) -> [0: bb5, otherwise: bb6];
|
||||
}
|
||||
|
||||
bb5: {
|
||||
_0 = const {transmute(0x0000000000000000): Option<&T>};
|
||||
goto -> bb8;
|
||||
}
|
||||
|
||||
bb6: {
|
||||
_12 = SubUnchecked(copy _11, const 1_usize);
|
||||
((*_1).1: *const T) = copy _12 as *const T (Transmute);
|
||||
goto -> bb7;
|
||||
}
|
||||
|
||||
bb7: {
|
||||
StorageLive(_13);
|
||||
_13 = copy _2 as *const T (Transmute);
|
||||
_14 = &(*_13);
|
||||
StorageDead(_13);
|
||||
_0 = Option::<&T>::Some(copy _14);
|
||||
goto -> bb8;
|
||||
}
|
||||
|
||||
bb8: {
|
||||
StorageDead(_14);
|
||||
StorageDead(_4);
|
||||
StorageDead(_12);
|
||||
StorageDead(_11);
|
||||
StorageDead(_3);
|
||||
StorageDead(_2);
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
@ -3,12 +3,134 @@
|
||||
fn slice_iter_next(_1: &mut std::slice::Iter<'_, T>) -> Option<&T> {
|
||||
debug it => _1;
|
||||
let mut _0: std::option::Option<&T>;
|
||||
scope 1 (inlined <std::slice::Iter<'_, T> as Iterator>::next) {
|
||||
let _2: std::ptr::NonNull<T>;
|
||||
let _4: std::ptr::NonNull<T>;
|
||||
let mut _7: bool;
|
||||
let mut _10: std::ptr::NonNull<T>;
|
||||
let mut _12: usize;
|
||||
let _14: &T;
|
||||
scope 2 {
|
||||
let _3: *const T;
|
||||
scope 3 {
|
||||
let _11: usize;
|
||||
scope 4 {
|
||||
scope 7 (inlined core::num::<impl usize>::unchecked_sub) {
|
||||
scope 8 (inlined core::ub_checks::check_language_ub) {
|
||||
scope 9 (inlined core::ub_checks::check_language_ub::runtime) {
|
||||
}
|
||||
}
|
||||
}
|
||||
scope 10 (inlined without_provenance_mut::<T>) {
|
||||
}
|
||||
}
|
||||
scope 5 (inlined std::ptr::const_ptr::<impl *const T>::addr) {
|
||||
scope 6 (inlined std::ptr::const_ptr::<impl *const T>::cast::<()>) {
|
||||
}
|
||||
}
|
||||
scope 11 (inlined <NonNull<T> as PartialEq>::eq) {
|
||||
let mut _5: *mut T;
|
||||
let mut _6: *mut T;
|
||||
scope 12 (inlined NonNull::<T>::as_ptr) {
|
||||
}
|
||||
scope 13 (inlined NonNull::<T>::as_ptr) {
|
||||
}
|
||||
}
|
||||
scope 14 (inlined NonNull::<T>::add) {
|
||||
let mut _8: *const T;
|
||||
let mut _9: *const T;
|
||||
scope 15 (inlined NonNull::<T>::as_ptr) {
|
||||
}
|
||||
}
|
||||
scope 16 (inlined NonNull::<T>::as_ref::<'_>) {
|
||||
let _13: *const T;
|
||||
scope 17 (inlined NonNull::<T>::as_ptr) {
|
||||
}
|
||||
scope 18 (inlined std::ptr::mut_ptr::<impl *mut T>::cast_const) {
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
bb0: {
|
||||
_0 = <std::slice::Iter<'_, T> as Iterator>::next(move _1) -> [return: bb1, unwind continue];
|
||||
StorageLive(_2);
|
||||
StorageLive(_3);
|
||||
StorageLive(_11);
|
||||
StorageLive(_12);
|
||||
StorageLive(_4);
|
||||
StorageLive(_14);
|
||||
_2 = copy ((*_1).0: std::ptr::NonNull<T>);
|
||||
_3 = copy ((*_1).1: *const T);
|
||||
switchInt(const <T as std::mem::SizedTypeProperties>::IS_ZST) -> [0: bb1, otherwise: bb4];
|
||||
}
|
||||
|
||||
bb1: {
|
||||
StorageLive(_7);
|
||||
_4 = copy _3 as std::ptr::NonNull<T> (Transmute);
|
||||
StorageLive(_5);
|
||||
_5 = copy _2 as *mut T (Transmute);
|
||||
StorageLive(_6);
|
||||
_6 = copy _4 as *mut T (Transmute);
|
||||
_7 = Eq(move _5, move _6);
|
||||
StorageDead(_6);
|
||||
StorageDead(_5);
|
||||
switchInt(move _7) -> [0: bb2, otherwise: bb3];
|
||||
}
|
||||
|
||||
bb2: {
|
||||
StorageDead(_7);
|
||||
StorageLive(_10);
|
||||
StorageLive(_9);
|
||||
StorageLive(_8);
|
||||
_8 = copy _2 as *const T (Transmute);
|
||||
_9 = Offset(move _8, const 1_usize);
|
||||
StorageDead(_8);
|
||||
_10 = NonNull::<T> { pointer: move _9 };
|
||||
StorageDead(_9);
|
||||
((*_1).0: std::ptr::NonNull<T>) = move _10;
|
||||
StorageDead(_10);
|
||||
goto -> bb7;
|
||||
}
|
||||
|
||||
bb3: {
|
||||
_0 = const {transmute(0x0000000000000000): Option<&T>};
|
||||
StorageDead(_7);
|
||||
goto -> bb8;
|
||||
}
|
||||
|
||||
bb4: {
|
||||
_11 = copy _3 as usize (Transmute);
|
||||
switchInt(copy _11) -> [0: bb5, otherwise: bb6];
|
||||
}
|
||||
|
||||
bb5: {
|
||||
_0 = const {transmute(0x0000000000000000): Option<&T>};
|
||||
goto -> bb8;
|
||||
}
|
||||
|
||||
bb6: {
|
||||
_12 = SubUnchecked(copy _11, const 1_usize);
|
||||
((*_1).1: *const T) = copy _12 as *const T (Transmute);
|
||||
goto -> bb7;
|
||||
}
|
||||
|
||||
bb7: {
|
||||
StorageLive(_13);
|
||||
_13 = copy _2 as *const T (Transmute);
|
||||
_14 = &(*_13);
|
||||
StorageDead(_13);
|
||||
_0 = Option::<&T>::Some(copy _14);
|
||||
goto -> bb8;
|
||||
}
|
||||
|
||||
bb8: {
|
||||
StorageDead(_14);
|
||||
StorageDead(_4);
|
||||
StorageDead(_12);
|
||||
StorageDead(_11);
|
||||
StorageDead(_3);
|
||||
StorageDead(_2);
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user