Add a comment about explicit_bzero's use of asm!.

sunfishcode · Dec 20, 2023 · 53f29db · 53f29db
1 parent 29a77e2
commit 53f29db
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/c-scape/src/mem/mem.rs b/c-scape/src/mem/mem.rs
@@ -188,6 +188,9 @@ unsafe extern "C" fn explicit_bzero(dst: *mut c_void, len: size_t) {
     libc!(libc::explicit_bzero(dst, len));
 
     bzero(dst, len);
+
+    // Attempt to discourage compiler optimizations from thinking this `bzero`
+    // is unnecessary.
     core::arch::asm!("# {}, {}", in(reg) dst, in(reg) len, options(nostack, preserves_flags));
 }