[RFC] Dropping Alpha sparse mapping support from X

[Ian Romanick]

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Matt Turner wrote:
> Hi,
> I'd like to drop support for non-BWX Alphas (EV4 and original EV5)
> from X. These machines can't load/store to single bytes and require
> special sparse memory mappings.
> 
> The code required to select which functions (sparse, dense) is
> convoluted, adds an extra layer of indirection, probably gets close to
> zero usage, and even less testing.
> 
> Does anyone use X on EV4 or EV5 (not EV56, EV56 has BWX)?

My Alpha is an EV56.  I had not booted it for 480 days, so it wouldn't
really have mattered.
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