(In reply to Lauri Kasanen from comment #0)
> Many big shaders that currently fail with
> r600_shader_select - Failed to build shader variant (type=1) -12
> r600_shader_from_tgsi - GPR limit exceeded - shader requires foo registers
> 
> would actually work if the GPR check was moved to after SB, as SB reduces
> the GPR usage quite nicely.
> 
> Another thing is that 128 is the lowest common denominator, and many cards
> have 192 or 256, which could be checked with the radeon_info ioctl.

>From an ISA perspective, there are only 128 GPRs.  The higher limits are hw
internal details.