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Subject: Re: Why is assembly more effecient than C?

Author: Danniel Corbit

Date: 00:09:32 09/28/98

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On September 27, 1998 at 18:15:36, Robert Hyatt wrote:
[snip]
>Depends on how far you take it.  Cray Blitz... pure fortran (using the
>very best fortran compiler on the planet, too) is 5x *slower* than the
>hand-coded assembly language version.  Different approach in the asm
>version, keeping things in registers longer, doing things that are
>architecture specific, etc...
>
>But it can make a big difference.
Do they have a KAP preprocessor for the CRAY?  If so, was that used?  I have
seen it make a 2 or 3x improvement in some VAX multi-cpu code.



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