# endif
# ifdef SHA1_ASM
-# if defined(__i386) || defined(__i386__) || defined(_M_IX86) || defined(__INTEL__)
+# if defined(__i386) || defined(__i386__) || defined(_M_IX86) || defined(__INTEL__) \
+ || defined(__x86_64) || defined(__x86_64__) || defined(_M_AMD64) || defined(_M_X64)
# define sha1_block_host_order sha1_block_asm_host_order
# define DONT_IMPLEMENT_BLOCK_HOST_ORDER
# define sha1_block_data_order sha1_block_asm_data_order