Prevent perf regressions in mbedtls_xor
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/library/common.h b/library/common.h
index fd3ddba..ae6625b 100644
--- a/library/common.h
+++ b/library/common.h
@@ -122,11 +122,13 @@
*/
inline void mbedtls_xor(unsigned char *r, const unsigned char *a, const unsigned char *b, size_t n)
{
- size_t i;
- for (i = 0; (i + 4) <= n; i += 4) {
+ size_t i = 0;
+#if defined(MBEDTLS_EFFICIENT_UNALIGNED_ACCESS)
+ for (; (i + 4) <= n; i += 4) {
uint32_t x = mbedtls_get_unaligned_uint32(a + i) ^ mbedtls_get_unaligned_uint32(b + i);
mbedtls_put_unaligned_uint32(r + i, x);
}
+#endif
for (; i < n; i++) {
r[i] = a[i] ^ b[i];
}