[Mesa-dev] [PATCH 3/3] i965: Support copy propagating of untyped atomic surface indexes.

[Kenneth Graunke]

In the vec4 backend, SHADER_OPCODE_UNTYPED_ATOMIC's src[1] is the
surface index.  We want to copy propagate so we can use an immediate
message descriptor, rather than an indirect send.
---
 src/intel/compiler/brw_vec4_copy_propagation.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/intel/compiler/brw_vec4_copy_propagation.cpp b/src/intel/compiler/brw_vec4_copy_propagation.cpp
index c1ae32a2936..63155ecdfb0 100644
--- a/src/intel/compiler/brw_vec4_copy_propagation.cpp
+++ b/src/intel/compiler/brw_vec4_copy_propagation.cpp
@@ -190,6 +190,13 @@ try_constant_propagate(const struct gen_device_info *devinfo,
       inst->src[arg] = value;
       return true;
 
+   case SHADER_OPCODE_UNTYPED_ATOMIC:
+      if (arg == 1) {
+         inst->src[arg] = value;
+         return true;
+      }
+      break;
+
    case SHADER_OPCODE_POW:
    case SHADER_OPCODE_INT_QUOTIENT:
    case SHADER_OPCODE_INT_REMAINDER:
-- 
2.11.0