diff --git a/libc/src/string/memory_utils/bcmp_implementations.h b/libc/src/string/memory_utils/bcmp_implementations.h
--- a/libc/src/string/memory_utils/bcmp_implementations.h
+++ b/libc/src/string/memory_utils/bcmp_implementations.h
@@ -143,7 +143,7 @@
 
 [[maybe_unused]] LIBC_INLINE BcmpReturnType inline_bcmp_x86(CPtr p1, CPtr p2,
                                                             size_t count) {
-  if (count == 0)
+  if (count == 0 || p1 == p2)
     return BcmpReturnType::ZERO();
   if (count == 1)
     return generic::Bcmp<1>::block(p1, p2);
diff --git a/libc/src/string/memory_utils/x86_64/memcmp_implementations.h b/libc/src/string/memory_utils/x86_64/memcmp_implementations.h
--- a/libc/src/string/memory_utils/x86_64/memcmp_implementations.h
+++ b/libc/src/string/memory_utils/x86_64/memcmp_implementations.h
@@ -70,7 +70,7 @@
 
 LIBC_INLINE MemcmpReturnType inline_memcmp_x86(CPtr p1, CPtr p2, size_t count) {
 
-  if (count == 0)
+  if (count == 0 || p1 == p2)
     return MemcmpReturnType::ZERO();
   if (count == 1)
     return generic::Memcmp<1>::block(p1, p2);