radeonsi: remove 2 unused user SGPRs from merged TES-GS with 32-bit pointers

The effect of the last 13 commits on user SGPR counts:

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

4 files changed, 35 insertions, 11 deletions

diff --git a/src/gallium/drivers/radeonsi/si_descriptors.c b/src/gallium/drivers/radeonsi/si_descriptors.c
index c497c2ff147..4a0cc290911 100644
--- a/src/gallium/drivers/radeonsi/si_descriptors.c
+++ b/src/gallium/drivers/radeonsi/si_descriptors.c
@@ -2136,7 +2136,7 @@ void si_emit_graphics_shader_pointers(struct si_context *sctx,
 			if (sctx->tes_shader.cso)
 				sh_dw_offset = GFX9_TCS_NUM_USER_SGPR;
 			else if (sctx->gs_shader.cso)
-				sh_dw_offset = GFX9_GS_NUM_USER_SGPR;
+				sh_dw_offset = GFX9_VSGS_NUM_USER_SGPR;
 		}
 
 		unsigned sh_offset = sh_base[PIPE_SHADER_VERTEX] + sh_dw_offset * 4;
diff --git a/src/gallium/drivers/radeonsi/si_shader.c b/src/gallium/drivers/radeonsi/si_shader.c
index 1f5af71653a..b69c1bbb24b 100644
--- a/src/gallium/drivers/radeonsi/si_shader.c
+++ b/src/gallium/drivers/radeonsi/si_shader.c
@@ -3430,7 +3430,12 @@ static void si_set_es_return_value_for_gs(struct si_shader_context *ctx)
 				  8 + GFX9_SGPR_2ND_SAMPLERS_AND_IMAGES);
 #endif
 
-	unsigned vgpr = 8 + GFX9_GS_NUM_USER_SGPR;
+	unsigned vgpr;
+	if (ctx->type == PIPE_SHADER_VERTEX)
+		vgpr = 8 + GFX9_VSGS_NUM_USER_SGPR;
+	else
+		vgpr = 8 + GFX9_TESGS_NUM_USER_SGPR;
+
 	for (unsigned i = 0; i < 5; i++) {
 		unsigned param = ctx->param_gs_vtx01_offset + i;
 		ret = si_insert_input_ret_float(ctx, ret, param, vgpr++);
@@ -4789,12 +4794,13 @@ static void create_function(struct si_shader_context *ctx)
 		if (ctx->type == PIPE_SHADER_VERTEX) {
 			declare_vs_specific_input_sgprs(ctx, &fninfo);
 		} else {
-			/* TESS_EVAL (and also GEOMETRY):
-			 * Declare as many input SGPRs as the VS has. */
 			ctx->param_tcs_offchip_layout = add_arg(&fninfo, ARG_SGPR, ctx->i32);
 			ctx->param_tes_offchip_addr = add_arg(&fninfo, ARG_SGPR, ctx->i32);
-			add_arg(&fninfo, ARG_SGPR, ctx->i32); /* unused */
-			ctx->param_vs_state_bits = add_arg(&fninfo, ARG_SGPR, ctx->i32); /* unused */
+			if (!HAVE_32BIT_POINTERS) {
+				/* Declare as many input SGPRs as the VS has. */
+				add_arg(&fninfo, ARG_SGPR, ctx->i32); /* unused */
+				ctx->param_vs_state_bits = add_arg(&fninfo, ARG_SGPR, ctx->i32); /* unused */
+			}
 		}
 
 		if (!HAVE_32BIT_POINTERS) {
@@ -4822,8 +4828,15 @@ static void create_function(struct si_shader_context *ctx)
 
 		if (ctx->type == PIPE_SHADER_VERTEX ||
 		    ctx->type == PIPE_SHADER_TESS_EVAL) {
+			unsigned num_user_sgprs;
+
+			if (ctx->type == PIPE_SHADER_VERTEX)
+				num_user_sgprs = GFX9_VSGS_NUM_USER_SGPR;
+			else
+				num_user_sgprs = GFX9_TESGS_NUM_USER_SGPR;
+
 			/* ES return values are inputs to GS. */
-			for (i = 0; i < 8 + GFX9_GS_NUM_USER_SGPR; i++)
+			for (i = 0; i < 8 + num_user_sgprs; i++)
 				returns[num_returns++] = ctx->i32; /* SGPRs */
 			for (i = 0; i < 5; i++)
 				returns[num_returns++] = ctx->f32; /* VGPRs */
@@ -6342,7 +6355,10 @@ static void si_build_gs_prolog_function(struct si_shader_context *ctx,
 	si_init_function_info(&fninfo);
 
 	if (ctx->screen->info.chip_class >= GFX9) {
-		num_sgprs = 8 + GFX9_GS_NUM_USER_SGPR;
+		if (key->gs_prolog.states.gfx9_prev_is_vs)
+			num_sgprs = 8 + GFX9_VSGS_NUM_USER_SGPR;
+		else
+			num_sgprs = 8 + GFX9_TESGS_NUM_USER_SGPR;
 		num_vgprs = 5; /* ES inputs are not needed by GS */
 	} else {
 		num_sgprs = GFX6_GS_NUM_USER_SGPR + 2;
diff --git a/src/gallium/drivers/radeonsi/si_shader.h b/src/gallium/drivers/radeonsi/si_shader.h
index 471f2e9f589..f58978989d4 100644
--- a/src/gallium/drivers/radeonsi/si_shader.h
+++ b/src/gallium/drivers/radeonsi/si_shader.h
@@ -212,7 +212,13 @@ enum {
 
 	/* GS limits */
 	GFX6_GS_NUM_USER_SGPR = SI_NUM_RESOURCE_SGPRS,
-	GFX9_GS_NUM_USER_SGPR = GFX9_MERGED_NUM_USER_SGPR,
+#if HAVE_32BIT_POINTERS
+	GFX9_VSGS_NUM_USER_SGPR = SI_VS_NUM_USER_SGPR,
+	GFX9_TESGS_NUM_USER_SGPR = SI_TES_NUM_USER_SGPR,
+#else
+	GFX9_VSGS_NUM_USER_SGPR = GFX9_MERGED_NUM_USER_SGPR,
+	GFX9_TESGS_NUM_USER_SGPR = GFX9_MERGED_NUM_USER_SGPR,
+#endif
 	SI_GSCOPY_NUM_USER_SGPR = SI_SGPR_RW_BUFFERS + (HAVE_32BIT_POINTERS ? 1 : 2),
 
 	/* PS only */
@@ -425,6 +431,7 @@ struct si_tcs_epilog_bits {
 
 struct si_gs_prolog_bits {
 	unsigned	tri_strip_adj_fix:1;
+	unsigned	gfx9_prev_is_vs:1;
 };
 
 /* Common PS bits between the shader key and the prolog key. */
diff --git a/src/gallium/drivers/radeonsi/si_state_shaders.c b/src/gallium/drivers/radeonsi/si_state_shaders.c
index 3643ba500b6..b28352951a5 100644
--- a/src/gallium/drivers/radeonsi/si_state_shaders.c
+++ b/src/gallium/drivers/radeonsi/si_state_shaders.c
@@ -785,9 +785,9 @@ static void si_shader_gs(struct si_screen *sscreen, struct si_shader *shader)
 
 		unsigned num_user_sgprs;
 		if (es_type == PIPE_SHADER_VERTEX)
-			num_user_sgprs = si_get_num_vs_user_sgprs(GFX9_GS_NUM_USER_SGPR);
+			num_user_sgprs = si_get_num_vs_user_sgprs(GFX9_VSGS_NUM_USER_SGPR);
 		else
-			num_user_sgprs = GFX9_GS_NUM_USER_SGPR;
+			num_user_sgprs = GFX9_TESGS_NUM_USER_SGPR;
 
 		gfx9_get_gs_info(shader->key.part.gs.es, sel, &gs_info);
 
@@ -1317,6 +1317,7 @@ static inline void si_shader_selector_key(struct pipe_context *ctx,
 				si_shader_selector_key_vs(sctx, sctx->vs_shader.cso,
 							  key, &key->part.gs.vs_prolog);
 				key->part.gs.es = sctx->vs_shader.cso;
+				key->part.gs.prolog.gfx9_prev_is_vs = 1;
 			}
 
 			/* Merged ES-GS can have unbalanced wave usage.