i965/fs: Add support for ir_unop_saturate

Reviewed-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>

src/mesa/drivers/dri/i965/brw_fs_channel_expressions.cpp

@@ -246,6 +246,7 @@ ir_channel_expressions_visitor::visit_leave(ir_assignment *ir)
    case ir_unop_bit_count:
    case ir_unop_find_msb:
    case ir_unop_find_lsb:
+   case ir_unop_saturate:
       for (i = 0; i < vector_elements; i++) {
 	 ir_rvalue *op0 = get_element(op_var[0], i);
 

src/mesa/drivers/dri/i965/brw_fs_visitor.cpp

@@ -864,6 +864,10 @@ fs_visitor::visit(ir_expression *ir)
    case ir_unop_find_lsb:
       emit(FBL(this->result, op[0]));
       break;
+   case ir_unop_saturate:
+      inst = emit(MOV(this->result, op[0]));
+      inst->saturate = true;
+      break;
    case ir_triop_bitfield_extract:
       /* Note that the instruction's argument order is reversed from GLSL
        * and the IR.