radeonsi: reduce LDS stalls by 40% for tessellation

[mesa.git] / src / gallium / drivers / radeonsi / si_state_shaders.c

diff --git a/src/gallium/drivers/radeonsi/si_state_shaders.c b/src/gallium/drivers/radeonsi/si_state_shaders.c
index 4e0320a226d823dc277ed040c23ea69206e5a006..de33d2503018c7c16829a7dea9dabfc810aab907 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_state_shaders.c
+++ b/src/gallium/drivers/radeonsi/si_state_shaders.c
@@ -2160,6 +2160,13 @@ static void *si_create_shader_selector(struct pipe_context *ctx,
                        }
                }
                sel->esgs_itemsize = util_last_bit64(sel->outputs_written) * 16;
+               sel->lshs_vertex_stride = sel->esgs_itemsize;
+
+               /* Add 1 dword to reduce LDS bank conflicts, so that each vertex
+                * will start on a different bank. (except for the maximum 32*16).
+                */
+               if (sel->lshs_vertex_stride < 32*16)
+                       sel->lshs_vertex_stride += 4;
 
                /* For the ESGS ring in LDS, add 1 dword to reduce LDS bank
                 * conflicts, i.e. each vertex will start at a different bank.