From: Dave Airlie <airlied@redhat.com>
Date: Wed, 10 Jan 2018 06:08:48 +0000 (+0000)
Subject: r600/sb: add lds related peepholes.
X-Git-Tag: upstream/18.1.0~2561
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=44a27cdceca0b835d964ca16db68721816ae868f;p=platform%2Fupstream%2Fmesa.git

r600/sb: add lds related peepholes.

if no destination:
a) convert _RET instructions to non _RET variants if no dst
b) set src0 to undefined if it's a READ, this should get DCE then.

Acked-By: Roland Scheidegger <sroland@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
---

diff --git a/src/gallium/drivers/r600/sb/sb_peephole.cpp b/src/gallium/drivers/r600/sb/sb_peephole.cpp
index 49a6965..4390a8f 100644
--- a/src/gallium/drivers/r600/sb/sb_peephole.cpp
+++ b/src/gallium/drivers/r600/sb/sb_peephole.cpp
@@ -68,7 +68,14 @@ void peephole::run_on(container_node* c) {
 			if (n->is_alu_inst()) {
 				alu_node *a = static_cast<alu_node*>(n);
 
-				if (a->bc.op_ptr->flags &
+				if (a->bc.op_ptr->flags & AF_LDS) {
+					if (!a->dst[0]) {
+						if (a->bc.op >= LDS_OP2_LDS_ADD_RET && a->bc.op <= LDS_OP3_LDS_MSKOR_RET)
+							a->bc.set_op(a->bc.op - LDS_OP2_LDS_ADD_RET + LDS_OP2_LDS_ADD);
+						if (a->bc.op == LDS_OP1_LDS_READ_RET)
+							a->src[0] = sh.get_undef_value();
+					}
+				} else if (a->bc.op_ptr->flags &
 						(AF_PRED | AF_SET | AF_CMOV | AF_KILL)) {
 					optimize_cc_op(a);
 				} else if (a->bc.op == ALU_OP1_FLT_TO_INT) {