From: Dave Airlie <airlied@redhat.com>
Date: Thu, 9 Jul 2015 06:36:16 +0000 (+1000)
Subject: r600g/sb: add support for multiple streams to SB backend
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=3d497e0d915df8b71cd845c2cfbc6703db313628;p=mesa.git

r600g/sb: add support for multiple streams to SB backend

This adds a peephole and removes an assert that isn't
actually valid with some of the stream emit instructions.

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

diff --git a/src/gallium/drivers/r600/sb/sb_bc_finalize.cpp b/src/gallium/drivers/r600/sb/sb_bc_finalize.cpp
index dadee456a1f..522ff9d956e 100644
--- a/src/gallium/drivers/r600/sb/sb_bc_finalize.cpp
+++ b/src/gallium/drivers/r600/sb/sb_bc_finalize.cpp
@@ -764,8 +764,6 @@ void bc_finalizer::finalize_cf(cf_node* c) {
 			mask |= (1 << chan);
 		}
 
-		assert(reg >= 0 && mask);
-
 		if (reg >= 0)
 			update_ngpr(reg);
 
diff --git a/src/gallium/drivers/r600/sb/sb_bc_parser.cpp b/src/gallium/drivers/r600/sb/sb_bc_parser.cpp
index c4799270d9f..19bd0784a61 100644
--- a/src/gallium/drivers/r600/sb/sb_bc_parser.cpp
+++ b/src/gallium/drivers/r600/sb/sb_bc_parser.cpp
@@ -757,10 +757,22 @@ int bc_parser::prepare_ir() {
 			c->bc.end_of_program = eop;
 
 		} else if (flags & CF_EMIT) {
-			c->flags |= NF_DONT_KILL | NF_DONT_HOIST | NF_DONT_MOVE;
+			/* quick peephole */
+			cf_node *prev = static_cast<cf_node *>(c->prev);
+			if (c->bc.op == CF_OP_CUT_VERTEX &&
+				prev && prev->is_valid() &&
+				prev->bc.op == CF_OP_EMIT_VERTEX &&
+				c->bc.count == prev->bc.count) {
+				prev->bc.set_op(CF_OP_EMIT_CUT_VERTEX);
+				prev->bc.end_of_program = c->bc.end_of_program;
+				c->remove();
+			}
+			else {
+				c->flags |= NF_DONT_KILL | NF_DONT_HOIST | NF_DONT_MOVE;
 
-			c->src.push_back(sh->get_special_value(SV_GEOMETRY_EMIT));
-			c->dst.push_back(sh->get_special_value(SV_GEOMETRY_EMIT));
+				c->src.push_back(sh->get_special_value(SV_GEOMETRY_EMIT));
+				c->dst.push_back(sh->get_special_value(SV_GEOMETRY_EMIT));
+			}
 		}
 	}