Added new intrinsic declaration

Author: BLANKatGITHUB

library/core/src/intrinsics/mod.rs

@@ -1297,7 +1297,91 @@ pub unsafe fn atomic_singlethreadfence_acquire() {
 pub unsafe fn atomic_singlethreadfence_release() {
     unreachable!()
 }
+/// A compiler-only memory barrier.
+///
+/// Memory accesses will never be reordered across this barrier by the
+/// compiler, but no instructions will be emitted for it. This is
+/// appropriate for operations on the same thread that may be preempted,
+/// such as when interacting with signal handlers.
+///
+/// The stabilized version of this intrinsic is available in
+/// [`atomic::compiler_fence`] by passing [`Ordering::AcqRel`]
+/// as the `order`.
+#[rustc_intrinsic]
+#[rustc_intrinsic_must_be_overridden]
+#[rustc_nounwind]
+pub unsafe fn atomic_singlethreadfence_acqrel() {
+    unreachable!()
+}
+
+/// The `prefetch` intrinsic is a hint to the code generator to insert a prefetch instruction
+/// if supported; otherwise, it is a no-op.
+/// Prefetches have no effect on the behavior of the program but can change its performance
+/// characteristics.
+///
+/// The `locality` argument must be a constant integer and is a temporal locality specifier
+/// ranging from (0) - no locality, to (3) - extremely local keep in cache.
+///
+/// This intrinsic does not have a stable counterpart.
+#[rustc_nounwind]
+pub unsafe fn prefetch_read_data<T>(_data: *const T, _locality: i32) {
+    unreachable!()
+}
+/// The `prefetch` intrinsic is a hint to the code generator to insert a prefetch instruction
+/// if supported; otherwise, it is a no-op.
+/// Prefetches have no effect on the behavior of the program but can change its performance
+/// characteristics.
+///
+/// The `locality` argument must be a constant integer and is a temporal locality specifier
+/// ranging from (0) - no locality, to (3) - extremely local keep in cache.
+///
+/// This intrinsic does not have a stable counterpart.
+#[rustc_intrinsic]
+#[rustc_intrinsic_must_be_overridden]
+#[rustc_nounwind]
+pub unsafe fn prefetch_write_data<T>(_data: *const T, _locality: i32) {
+    unreachable!()
+}
+/// The `prefetch` intrinsic is a hint to the code generator to insert a prefetch instruction
+/// if supported; otherwise, it is a no-op.
+/// Prefetches have no effect on the behavior of the program but can change its performance
+/// characteristics.
+///
+/// The `locality` argument must be a constant integer and is a temporal locality specifier
+/// ranging from (0) - no locality, to (3) - extremely local keep in cache.
+///
+/// This intrinsic does not have a stable counterpart.
+#[rustc_intrinsic]
+#[rustc_intrinsic_must_be_overridden]
+#[rustc_nounwind]
+pub unsafe fn prefetch_read_instruction<T>(_data: *const T, _locality: i32) {
+    unreachable!()
+}
+/// The `prefetch` intrinsic is a hint to the code generator to insert a prefetch instruction
+/// if supported; otherwise, it is a no-op.
+/// Prefetches have no effect on the behavior of the program but can change its performance
+/// characteristics.
+///
+/// The `locality` argument must be a constant integer and is a temporal locality specifier
+/// ranging from (0) - no locality, to (3) - extremely local keep in cache.
+///
+/// This intrinsic does not have a stable counterpart.
+#[rustc_intrinsic]
+#[rustc_intrinsic_must_be_overridden]
+#[rustc_nounwind]
+pub unsafe fn prefetch_write_instruction<T>(_data: *const T, _locality: i32) {
+    unreachable!()
+}
 
+/// Executes a breakpoint trap, for inspection by a debugger.
+///
+/// This intrinsic does not have a stable counterpart.
+#[rustc_intrinsic]
+#[rustc_intrinsic_must_be_overridden]
+#[rustc_nounwind]
+pub unsafe fn breakpoint() {
+    unreachable!()
+}
 
 /// Aborts the execution of the process.
 ///