i965/nir/vec4: Implement equality ops on vectors

Adds NIR ALU operations:
   * nir_op_ball_fequal2
   * nir_op_ball_iequal2
   * nir_op_ball_fequal3
   * nir_op_ball_iequal3
   * nir_op_ball_fequal4
   * nir_op_ball_iequal4

Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>

diff --git a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
index 34a9f4fc46d8707082912d5939e588d0c522c824..4e85b94723ca58596edf7aaec01cf8d0c59806c7 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
@@ -922,6 +922,39 @@ vec4_visitor::nir_emit_alu(nir_alu_instr *instr)
                brw_conditional_for_nir_comparison(instr->op)));
       break;
 
+   case nir_op_ball_fequal2:
+   case nir_op_ball_iequal2:
+   case nir_op_ball_fequal3:
+   case nir_op_ball_iequal3:
+   case nir_op_ball_fequal4:
+   case nir_op_ball_iequal4: {
+      dst_reg tmp = dst_reg(this, glsl_type::bool_type);
+
+      switch (instr->op) {
+      case nir_op_ball_fequal2:
+      case nir_op_ball_iequal2:
+         tmp.writemask = WRITEMASK_XY;
+         break;
+      case nir_op_ball_fequal3:
+      case nir_op_ball_iequal3:
+         tmp.writemask = WRITEMASK_XYZ;
+         break;
+      case nir_op_ball_fequal4:
+      case nir_op_ball_iequal4:
+         tmp.writemask = WRITEMASK_XYZW;
+         break;
+      default:
+         unreachable("not reached");
+      }
+
+      emit(CMP(tmp, op[0], op[1],
+               brw_conditional_for_nir_comparison(instr->op)));
+      emit(MOV(dst, src_reg(0)));
+      inst = emit(MOV(dst, src_reg(~0)));
+      inst->predicate = BRW_PREDICATE_ALIGN16_ALL4H;
+      break;
+   }
+
    default:
       unreachable("Unimplemented ALU operation");
    }