Auto merge of rust-lang#119892 - joboet:libs_use_assert_unchecked, r=Nilstrieb,cuviper

Use `assert_unchecked` instead of `assume` intrinsic in the standard library

Now that a public wrapper for the `assume` intrinsic exists, we can use it in the standard library.

CC rust-lang#119131

Author: bors

library/alloc/src/alloc.rs

@@ -3,7 +3,7 @@
 #![stable(feature = "alloc_module", since = "1.28.0")]
 
 #[cfg(not(test))]
-use core::intrinsics;
+use core::hint;
 
 #[cfg(not(test))]
 use core::ptr::{self, NonNull};
@@ -208,7 +208,7 @@ impl Global {
                 let new_size = new_layout.size();
 
                 // `realloc` probably checks for `new_size >= old_layout.size()` or something similar.
-                intrinsics::assume(new_size >= old_layout.size());
+                hint::assert_unchecked(new_size >= old_layout.size());
 
                 let raw_ptr = realloc(ptr.as_ptr(), old_layout, new_size);
                 let ptr = NonNull::new(raw_ptr).ok_or(AllocError)?;
@@ -299,7 +299,7 @@ unsafe impl Allocator for Global {
             // SAFETY: `new_size` is non-zero. Other conditions must be upheld by the caller
             new_size if old_layout.align() == new_layout.align() => unsafe {
                 // `realloc` probably checks for `new_size <= old_layout.size()` or something similar.
-                intrinsics::assume(new_size <= old_layout.size());
+                hint::assert_unchecked(new_size <= old_layout.size());
 
                 let raw_ptr = realloc(ptr.as_ptr(), old_layout, new_size);
                 let ptr = NonNull::new(raw_ptr).ok_or(AllocError)?;

library/alloc/src/lib.rs

@@ -129,6 +129,7 @@
 #![feature(fmt_internals)]
 #![feature(fn_traits)]
 #![feature(hasher_prefixfree_extras)]
+#![feature(hint_assert_unchecked)]
 #![feature(inline_const)]
 #![feature(inplace_iteration)]
 #![feature(iter_advance_by)]

library/alloc/src/raw_vec.rs

@@ -2,7 +2,7 @@
 
 use core::alloc::LayoutError;
 use core::cmp;
-use core::intrinsics;
+use core::hint;
 use core::mem::{self, ManuallyDrop, MaybeUninit, SizedTypeProperties};
 use core::ptr::{self, NonNull, Unique};
 use core::slice;
@@ -325,7 +325,7 @@ impl<T, A: Allocator> RawVec<T, A> {
         }
         unsafe {
             // Inform the optimizer that the reservation has succeeded or wasn't needed
-            core::intrinsics::assume(!self.needs_to_grow(len, additional));
+            hint::assert_unchecked(!self.needs_to_grow(len, additional));
         }
         Ok(())
     }
@@ -363,7 +363,7 @@ impl<T, A: Allocator> RawVec<T, A> {
         }
         unsafe {
             // Inform the optimizer that the reservation has succeeded or wasn't needed
-            core::intrinsics::assume(!self.needs_to_grow(len, additional));
+            hint::assert_unchecked(!self.needs_to_grow(len, additional));
         }
         Ok(())
     }
@@ -514,7 +514,7 @@ where
         debug_assert_eq!(old_layout.align(), new_layout.align());
         unsafe {
             // The allocator checks for alignment equality
-            intrinsics::assume(old_layout.align() == new_layout.align());
+            hint::assert_unchecked(old_layout.align() == new_layout.align());
             alloc.grow(ptr, old_layout, new_layout)
         }
     } else {

library/alloc/src/rc.rs

@@ -252,6 +252,7 @@ use core::cell::Cell;
 use core::cmp::Ordering;
 use core::fmt;
 use core::hash::{Hash, Hasher};
+use core::hint;
 use core::intrinsics::abort;
 #[cfg(not(no_global_oom_handling))]
 use core::iter;
@@ -3268,7 +3269,7 @@ trait RcInnerPtr {
         // SAFETY: The reference count will never be zero when this is
         // called.
         unsafe {
-            core::intrinsics::assume(strong != 0);
+            hint::assert_unchecked(strong != 0);
         }
 
         let strong = strong.wrapping_add(1);
@@ -3301,7 +3302,7 @@ trait RcInnerPtr {
         // SAFETY: The reference count will never be zero when this is
         // called.
         unsafe {
-            core::intrinsics::assume(weak != 0);
+            hint::assert_unchecked(weak != 0);
         }
 
         let weak = weak.wrapping_add(1);

library/alloc/src/vec/mod.rs

@@ -1996,7 +1996,7 @@ impl<T, A: Allocator> Vec<T, A> {
         } else {
             unsafe {
                 self.len -= 1;
-                core::intrinsics::assume(self.len < self.capacity());
+                core::hint::assert_unchecked(self.len < self.capacity());
                 Some(ptr::read(self.as_ptr().add(self.len())))
             }
         }

library/core/src/alloc/global.rs

@@ -110,7 +110,7 @@ use crate::ptr;
 ///   ```rust,ignore (unsound and has placeholders)
 ///   drop(Box::new(42));
 ///   let number_of_heap_allocs = /* call private allocator API */;
-///   unsafe { std::intrinsics::assume(number_of_heap_allocs > 0); }
+///   unsafe { std::hint::assert_unchecked(number_of_heap_allocs > 0); }
 ///   ```
 ///
 ///   Note that the optimizations mentioned above are not the only

library/core/src/lib.rs

@@ -132,6 +132,7 @@
 #![feature(const_fmt_arguments_new)]
 #![feature(const_hash)]
 #![feature(const_heap)]
+#![feature(const_hint_assert_unchecked)]
 #![feature(const_index_range_slice_index)]
 #![feature(const_int_unchecked_arith)]
 #![feature(const_intrinsic_forget)]

library/core/src/num/mod.rs

@@ -3,6 +3,7 @@
 #![stable(feature = "rust1", since = "1.0.0")]
 
 use crate::ascii;
+use crate::hint;
 use crate::intrinsics;
 use crate::mem;
 use crate::ops::{Add, Mul, Sub};

library/core/src/num/uint_macros.rs

@@ -2452,8 +2452,8 @@ macro_rules! uint_impl {
             // SAFETY: the result is positive and fits in an integer with half as many bits.
             // Inform the optimizer about it.
             unsafe {
-                intrinsics::assume(0 < res);
-                intrinsics::assume(res < 1 << (Self::BITS / 2));
+                hint::assert_unchecked(0 < res);
+                hint::assert_unchecked(res < 1 << (Self::BITS / 2));
             }
 
             res

library/core/src/slice/index.rs

@@ -234,7 +234,7 @@ unsafe impl<T> SliceIndex<[T]> for usize {
         // `self` is in bounds of `slice` so `self` cannot overflow an `isize`,
         // so the call to `add` is safe.
         unsafe {
-            crate::intrinsics::assume(self < slice.len());
+            crate::hint::assert_unchecked(self < slice.len());
             slice.as_ptr().add(self)
         }
     }