[PATCH] Add DEC Alpha sum_s16 fast path

Michael Cree mcree at orcon.net.nz
Thu Nov 5 15:22:47 PST 2009

On 6/11/2009, at 11:25 AM, Matt Turner wrote:

> Lifted from Compaq's Compiler Writer's Guide for the Alpha 21264,
> appendix B.
> http://h18000.www1.hp.com/cpq-alphaserver/technology/literature/cmpwrgd.pdf
> Signed-off-by: Matt Turner <mattst88 at gmail.com>

While the code does not appear to use any EV6 (21264) specific  
instructions so should work on any Alpha it is carefully scheduled to  
be optimised for an EV6.  I wonder what performance gains are achieved  
on older Alphas?


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