The C version of bn_sub_part_words is needed not only

in NO_ASM configurations

crypto/bn/bn_mul.c

@@ -66,7 +66,7 @@
 #include "cryptlib.h"
 #include "bn_lcl.h"
 
-#if defined(NO_ASM)
+#if defined(NO_ASM) || !defined(__i386) /* Assembler implementation exists only for x86 */
 /* Here follows specialised variants of bn_add_words() and
    bn_sub_words().  They have the property performing operations on
    arrays of different sizes.  The sizes of those arrays is expressed through