From: Dave Airlie <airl...@redhat.com>
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.
---
src/gallium/drivers/r600/sb/sb_peephole.cpp | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/src/gallium/drivers/r600/sb/sb_peephole.cpp
b/src/gallium/drivers/r600/sb/sb_peephole.cpp
index 49a6965b1f..4390a8f525 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) {
--
2.14.3
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