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use is_multiple_of to check if an addr is aligned #958

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Jun 14, 2025
Merged

use is_multiple_of to check if an addr is aligned #958

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18 changes: 9 additions & 9 deletions compiler-builtins/src/arm.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -135,8 +135,8 @@ intrinsics! {
/// eight bytes.
#[cfg(not(target_vendor = "apple"))]
pub unsafe extern "aapcs" fn __aeabi_memcpy8(dst: *mut u8, src: *const u8, n: usize) {
debug_assert!(dst.addr() & 7 == 0);
debug_assert!(src.addr() & 7 == 0);
debug_assert!(dst.addr().is_multiple_of(8));
debug_assert!(src.addr().is_multiple_of(8));

// SAFETY: memcpy preconditions apply, less strict alignment.
unsafe { __aeabi_memcpy4(dst, src, n) };
Expand All @@ -161,8 +161,8 @@ intrinsics! {
/// four bytes.
#[cfg(not(any(target_vendor = "apple", target_env = "msvc")))]
pub unsafe extern "aapcs" fn __aeabi_memmove4(dst: *mut u8, src: *const u8, n: usize) {
debug_assert!(dst.addr() & 3 == 0);
debug_assert!(src.addr() & 3 == 0);
debug_assert!(dst.addr().is_multiple_of(4));
debug_assert!(src.addr().is_multiple_of(4));

// SAFETY: same preconditions, less strict aligment.
unsafe { __aeabi_memmove(dst, src, n) };
Expand All @@ -176,8 +176,8 @@ intrinsics! {
/// eight bytes.
#[cfg(not(any(target_vendor = "apple", target_env = "msvc")))]
pub unsafe extern "aapcs" fn __aeabi_memmove8(dst: *mut u8, src: *const u8, n: usize) {
debug_assert!(dst.addr() & 7 == 0);
debug_assert!(src.addr() & 7 == 0);
debug_assert!(dst.addr().is_multiple_of(8));
debug_assert!(src.addr().is_multiple_of(8));

// SAFETY: memmove preconditions apply, less strict alignment.
unsafe { __aeabi_memmove(dst, src, n) };
Expand Down Expand Up @@ -236,7 +236,7 @@ intrinsics! {
/// eight bytes.
#[cfg(not(target_vendor = "apple"))]
pub unsafe extern "aapcs" fn __aeabi_memset8(dst: *mut u8, n: usize, c: i32) {
debug_assert!(dst.addr() & 7 == 0);
debug_assert!(dst.addr().is_multiple_of(8));

// SAFETY: memset preconditions apply, less strict alignment.
unsafe { __aeabi_memset4(dst, n, c) };
Expand All @@ -261,7 +261,7 @@ intrinsics! {
/// four bytes.
#[cfg(not(any(target_vendor = "apple", target_env = "msvc")))]
pub unsafe extern "aapcs" fn __aeabi_memclr4(dst: *mut u8, n: usize) {
debug_assert!(dst.addr() & 3 == 0);
debug_assert!(dst.addr().is_multiple_of(4));

// SAFETY: memclr preconditions apply, less strict alignment.
unsafe { __aeabi_memset4(dst, n, 0) };
Expand All @@ -275,7 +275,7 @@ intrinsics! {
/// eight bytes.
#[cfg(not(any(target_vendor = "apple", target_env = "msvc")))]
pub unsafe extern "aapcs" fn __aeabi_memclr8(dst: *mut u8, n: usize) {
debug_assert!(dst.addr() & 7 == 0);
debug_assert!(dst.addr().is_multiple_of(8));

// SAFETY: memclr preconditions apply, less strict alignment.
unsafe { __aeabi_memset4(dst, n, 0) };
Expand Down