[Mesa-dev] [PATCH 2/2] i965/fs: Fix FB writes that tried to use the non-existent m16 register.

[Eric Anholt]

On Tue, 24 Apr 2012 00:34:00 -0700, Kenneth Graunke <kenneth at whitecape.org> wrote:
> A little analysis shows that the worst-case value for "nr" is 16:
> - base_mrf = 2                   ... 2
> - header present (say gen == 5)  ... 4
> - SIMD16 mode: += 4 * reg_width  ... 12
> - source_depth_to_render_target  ... 14
> - dest_depth_reg                 ... 16
> 
> This resulted in us setting base_mrf to 2 and mlen to 14.  In other
> words, we'd try to use m2..m16.  But m16 doesn't exist pre-Gen6.  Also,

nr is "where you'd put the next arg if there was one", right?  so nr of
16 should be fine, since you've only loaded up to m15?
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