Marek Working Towards Even Lower SGPR Register Usage

Yesterday well known open-source AMD developer Marek Olšák landed his RadeonSI 32-bit pointers support for freeing up some scalar general purpose registers (SGPRs) and he's continued with a new patch series to alleviate register usage even more.

A set of 13 patches were posted on Saturday by Marek for reducing user SGPR register usage. When using merged tessellation and geometry shader with 64-bit pointers, SGPR register use drops from 18 to 14 but with 32-bit pointers drops from 11 to 6. Other combinations are also saving a few registers. This patch series also happens to be a prerequisite for vertex buffer object (VBO) descriptors in user SGPRs.

All the details via this patch series.