[Bug 85596] SB is used only after GPR check / GPR max is not dynamic

https://bugs.freedesktop.org/show_bug.cgi?id=85596

--- Comment #1 from Alex Deucher agd5f@yahoo.com --- (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.