ac: only load used channels when sampling buffer views
This allows to reduce the number of dwords that are loaded with buffer_load_format_xyzw. For example, when the only used channel is 1, the driver will emit buffer_load_format_x instead. Shader stats for DOW3 (with some local hacky scripts for SPIRV): 143 shaders in 143 tests Totals: SGPRS: 5344 -> 5352 (0.15 %) VGPRS: 3476 -> 3452 (-0.69 %) Spilled SGPRs: 30 -> 29 (-3.33 %) Spilled VGPRs: 0 -> 0 (0.00 %) Private memory VGPRs: 0 -> 0 (0.00 %) Scratch size: 0 -> 0 (0.00 %) dwords per thread Code Size: 269860 -> 269808 (-0.02 %) bytes LDS: 0 -> 0 (0.00 %) blocks Max Waves: 1267 -> 1272 (0.39 %) Wait states: 0 -> 0 (0.00 %) Signed-off-by:Samuel Pitoiset <samuel.pitoiset@gmail.com> Reviewed-by:
Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl> Reviewed-by:
Nicolai Hähnle <nicolai.haehnle@amd.com>
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