Rollup merge of #100820 - WaffleLapkin:use_ptr_is_aligned_methods, r=scottmcm

Use pointer `is_aligned*` methods

This PR replaces some manual alignment checks with calls to `pointer::{is_aligned, is_aligned_to}` and removes a useless pointer cast.

r? `@scottmcm`

_split off from #100746_

2 files changed, 3 insertions, 2 deletions

diff --git a/library/std/src/lib.rs b/library/std/src/lib.rs
index 5029023121f..71bbf4317e0 100644
--- a/library/std/src/lib.rs
+++ b/library/std/src/lib.rs
@@ -296,6 +296,7 @@
 #![feature(panic_can_unwind)]
 #![feature(panic_info_message)]
 #![feature(panic_internals)]
+#![feature(pointer_is_aligned)]
 #![feature(portable_simd)]
 #![feature(prelude_2024)]
 #![feature(provide_any)]
diff --git a/library/std/src/sys/sgx/abi/usercalls/alloc.rs b/library/std/src/sys/sgx/abi/usercalls/alloc.rs
index fe8392f78cd..5409bd1777c 100644
--- a/library/std/src/sys/sgx/abi/usercalls/alloc.rs
+++ b/library/std/src/sys/sgx/abi/usercalls/alloc.rs
@@ -117,7 +117,7 @@ pub unsafe trait UserSafe {
     /// * the pointer is null.
     /// * the pointed-to range is not in user memory.
     unsafe fn check_ptr(ptr: *const Self) {
-        let is_aligned = |p: *const u8| -> bool { 0 == p.addr() & (Self::align_of() - 1) };
+        let is_aligned = |p: *const u8| -> bool { p.is_aligned_to(Self::align_of()) };
 
         assert!(is_aligned(ptr as *const u8));
         assert!(is_user_range(ptr as _, mem::size_of_val(unsafe { &*ptr })));
@@ -386,7 +386,7 @@ pub(crate) unsafe fn copy_to_userspace(src: *const u8, dst: *mut u8, len: usize)
         unsafe {
             copy_bytewise_to_userspace(src, dst, len);
         }
-    } else if len % 8 == 0 && dst as usize % 8 == 0 {
+    } else if len % 8 == 0 && dst.is_aligned_to(8) {
         // Copying 8-byte aligned quadwords: copy quad word per quad word
         unsafe {
             copy_quadwords(src, dst, len);