[Mesa-dev] [PATCH] gallivm: simplify geometry shader mask handling a bit

[Zack Rusin]

> From: Roland Scheidegger <sroland at vmware.com>
> 
> Instead of reducing masks to 0/1 simply use the mask directly as -1.
> Also use some signed comparison instead of unsigned (as far as I understand
> these values have to be (very) small and signed means llvm doesn't have to
> apply additional logic to do the unsigned comparisons the cpu can't do).
> Saves a couple of instructions in some test geometry shader here.
> 
> v2: that was a bit to much optimization, don't skip combining the masks...

k, I think that one looks good. 

Reviewed-by: Zack Rusin <zackr at vmware.com>