From: Dave Airlie <airlied@redhat.com>
Date: Tue, 24 Feb 2015 05:58:33 +0000 (+1000)
Subject: r600: increment ring index after emit vertex not before.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=4ebcf5194d98b47bd9e8a72b7418054708b14750;p=mesa.git

r600: increment ring index after emit vertex not before.

The docs say we should send the emit after the ring writes,
so lets do that and not have an ALU in between.

Signed-off-by: Dave Airlie <airlied@redhat.com>
---

diff --git a/src/gallium/drivers/r600/r600_shader.c b/src/gallium/drivers/r600/r600_shader.c
index fe4a27d36ff..e258d76301d 100644
--- a/src/gallium/drivers/r600/r600_shader.c
+++ b/src/gallium/drivers/r600/r600_shader.c
@@ -1793,6 +1793,27 @@ static int generate_gs_copy_shader(struct r600_context *rctx,
 	return r600_bytecode_build(ctx.bc);
 }
 
+static int emit_inc_ring_offset(struct r600_shader_ctx *ctx, int idx, bool ind)
+{
+	if (ind) {
+		struct r600_bytecode_alu alu;
+		int r;
+
+		memset(&alu, 0, sizeof(struct r600_bytecode_alu));
+		alu.op = ALU_OP2_ADD_INT;
+		alu.src[0].sel = ctx->gs_export_gpr_tregs[idx];
+		alu.src[1].sel = V_SQ_ALU_SRC_LITERAL;
+		alu.src[1].value = ctx->gs_out_ring_offset >> 4;
+		alu.dst.sel = ctx->gs_export_gpr_tregs[idx];
+		alu.dst.write = 1;
+		alu.last = 1;
+		r = r600_bytecode_add_alu(ctx->bc, &alu);
+		if (r)
+			return r;
+	}
+	return 0;
+}
+
 static int emit_gs_ring_writes(struct r600_shader_ctx *ctx, const struct pipe_stream_output_info *so, int stream, bool ind)
 {
 	struct r600_bytecode_output output;
@@ -1859,23 +1880,6 @@ static int emit_gs_ring_writes(struct r600_shader_ctx *ctx, const struct pipe_st
 		r600_bytecode_add_output(ctx->bc, &output);
 	}
 
-	if (ind) {
-		/* get a temp and add the ring offset to the next vertex base in the shader */
-		struct r600_bytecode_alu alu;
-		int r;
-
-		memset(&alu, 0, sizeof(struct r600_bytecode_alu));
-		alu.op = ALU_OP2_ADD_INT;
-		alu.src[0].sel = ctx->gs_export_gpr_tregs[effective_stream];
-		alu.src[1].sel = V_SQ_ALU_SRC_LITERAL;
-		alu.src[1].value = ctx->gs_out_ring_offset >> 4;
-		alu.dst.sel = ctx->gs_export_gpr_tregs[effective_stream];
-		alu.dst.write = 1;
-		alu.last = 1;
-		r = r600_bytecode_add_alu(ctx->bc, &alu);
-		if (r)
-			return r;
-	}
 	++ctx->gs_next_vertex;
 	return 0;
 }
@@ -7772,8 +7776,10 @@ static int tgsi_gs_emit(struct r600_shader_ctx *ctx)
 		emit_gs_ring_writes(ctx, ctx->gs_stream_output_info, stream, TRUE);
 
 	r = r600_bytecode_add_cfinst(ctx->bc, ctx->inst_info->op);
-	if (!r)
+	if (!r) {
 		ctx->bc->cf_last->count = stream; // Count field for CUT/EMIT_VERTEX indicates which stream
+		return emit_inc_ring_offset(ctx, stream, TRUE);
+	}
 	return r;
 }