+ir_expression *
+interpolate_at_centroid(operand a)
+{
+ return expr(ir_unop_interpolate_at_centroid, a);
+}
+
+ir_expression *
+interpolate_at_offset(operand a, operand b)
+{
+ return expr(ir_binop_interpolate_at_offset, a, b);
+}
+
+ir_expression *
+interpolate_at_sample(operand a, operand b)
+{
+ return expr(ir_binop_interpolate_at_sample, a, b);
+}
+