i965/fs: Implement basic SPIR-V subgroup intrinsics

Reviewed-by: Samuel Iglesias Gonsálvez <[email protected]>
Reviewed-by: Iago Toral Quiroga <[email protected]>

1 files changed, 8 insertions, 0 deletions

diff --git a/src/intel/compiler/brw_fs_nir.cpp b/src/intel/compiler/brw_fs_nir.cpp
index 554d61d71af..651997bb6ff 100644
--- a/src/intel/compiler/brw_fs_nir.cpp
+++ b/src/intel/compiler/brw_fs_nir.cpp
@@ -4501,6 +4501,14 @@ fs_visitor::nir_emit_intrinsic(const fs_builder &bld, nir_intrinsic_instr *instr
       break;
    }
 
+   case nir_intrinsic_first_invocation: {
+      fs_reg tmp = bld.vgrf(BRW_REGISTER_TYPE_UD);
+      bld.exec_all().emit(SHADER_OPCODE_FIND_LIVE_CHANNEL, tmp);
+      bld.MOV(retype(dest, BRW_REGISTER_TYPE_UD),
+              fs_reg(component(tmp, 0)));
+      break;
+   }
+
    default:
       unreachable("unknown intrinsic");
    }