Support for "multiply high" instruction, see BN_UMULT_HIGH comment in
crypto/bn/bn_lcl.h for further details. It should be noted that for the moment of this writing the code was tested only on Alpha. If compiled with DEC C the C implementation exhibits 12% performance improvement over the crypto/bn/asm/alpha.s (on EV56 box running AlphaLinux). GNU C is (unfortunately) 8% behind the assembler implementation. But it's OpenVMS Alpha users who *may* benefit most as 'apps/openssl speed rsa' exhibits 6 (six) times performance improvement over the original VMS bignum implementation. Where "*may*" means "as soon as code is enabled though #define SIXTY_FOUR_BIT and crypto/bn/asm/vms.mar is skipped."
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