diff --git a/vesad/src/primitive.rs b/vesad/src/primitive.rs
index 8427745485..16c2536a24 100644
--- a/vesad/src/primitive.rs
+++ b/vesad/src/primitive.rs
@@ -1,5 +1,4 @@
 #[cfg(target_arch = "x86_64")]
-#[allow(unused_assignments)]
 #[inline(always)]
 #[cold]
 pub unsafe fn fast_copy(dst: *mut u8, src: *const u8, len: usize) {
@@ -7,12 +6,11 @@ pub unsafe fn fast_copy(dst: *mut u8, src: *const u8, len: usize) {
         rep movsb"
         :
         : "{rdi}"(dst as usize), "{rsi}"(src as usize), "{rcx}"(len)
-        : "cc", "memory"
+        : "cc", "memory", "rdi", "rsi", "rcx"
         : "intel", "volatile");
 }
 
 #[cfg(target_arch = "x86_64")]
-#[allow(unused_assignments)]
 #[inline(always)]
 #[cold]
 pub unsafe fn fast_copy64(dst: *mut u64, src: *const u64, len: usize) {
@@ -20,12 +18,11 @@ pub unsafe fn fast_copy64(dst: *mut u64, src: *const u64, len: usize) {
         rep movsq"
         :
         : "{rdi}"(dst as usize), "{rsi}"(src as usize), "{rcx}"(len)
-        : "cc", "memory"
+        : "cc", "memory", "rdi", "rsi", "rcx"
         : "intel", "volatile");
 }
 
 #[cfg(target_arch = "x86_64")]
-#[allow(unused_assignments)]
 #[inline(always)]
 #[cold]
 pub unsafe fn fast_set32(dst: *mut u32, src: u32, len: usize) {
@@ -33,12 +30,11 @@ pub unsafe fn fast_set32(dst: *mut u32, src: u32, len: usize) {
         rep stosd"
         :
         : "{rdi}"(dst as usize), "{eax}"(src), "{rcx}"(len)
-        : "cc", "memory"
+        : "cc", "memory", "rdi", "rcx"
         : "intel", "volatile");
 }
 
 #[cfg(target_arch = "x86_64")]
-#[allow(unused_assignments)]
 #[inline(always)]
 #[cold]
 pub unsafe fn fast_set64(dst: *mut u64, src: u64, len: usize) {
@@ -46,6 +42,6 @@ pub unsafe fn fast_set64(dst: *mut u64, src: u64, len: usize) {
         rep stosq"
         :
         : "{rdi}"(dst as usize), "{rax}"(src), "{rcx}"(len)
-        : "cc", "memory"
+        : "cc", "memory", "rdi", "rcx"
         : "intel", "volatile");
 }