use volatile write unconditionally

Author: newpavlov

zeroize/src/lib.rs

@@ -298,7 +298,7 @@ where
     Z: DefaultIsZeroes,
 {
     fn zeroize(&mut self) {
-        *self = Z::default();
+        unsafe { ptr::write_volatile(self, Z::default()) };
         optimization_barrier(self);
     }
 }
@@ -866,38 +866,6 @@ unsafe fn write_zeros<T>(dst: *mut T) {
 
 /// Write `len * size_of::<T>()` zero bytes to the memory pointed by `dst`.
 unsafe fn write_zeros_multi<T>(dst: *mut T, len: usize) {
-    #[cfg(all(
-        not(miri),
-        any(
-            target_arch = "aarch64",
-            target_arch = "arm",
-            target_arch = "arm64ec",
-            target_arch = "loongarch64",
-            target_arch = "riscv32",
-            target_arch = "riscv64",
-            target_arch = "s390x",
-            target_arch = "x86",
-            target_arch = "x86_64",
-        )
-    ))]
-    unsafe {
-        ptr::write_bytes(dst, 0, len);
-    }
-
-    #[cfg(not(all(
-        not(miri),
-        any(
-            target_arch = "aarch64",
-            target_arch = "arm",
-            target_arch = "arm64ec",
-            target_arch = "loongarch64",
-            target_arch = "riscv32",
-            target_arch = "riscv64",
-            target_arch = "s390x",
-            target_arch = "x86",
-            target_arch = "x86_64",
-        )
-    )))]
     for i in 0..len {
         // Safety:
         //