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;;;; tests of backquote readmacro within the compiler
;;;; This software is part of the SBCL system. See the README file for
;;;; more information.
;;;;
;;;; While most of SBCL is derived from the CMU CL system, the test
;;;; files (like this one) were written from scratch after the fork
;;;; from CMU CL.
;;;;
;;;; This software is in the public domain and is provided with
;;;; absolutely no warranty. See the COPYING and CREDITS files for
;;;; more information.
;; In the expression `(,@l1 a b ,@l2) is it preferable that we expand this
;; as (APPEND L1 (LIST* 'A 'B L2)) or as (APPEND L1 '(A) '(B) L2)?
;; The IR1 transform is designed to catch the latter case, but the expander
;; returns the former, which probably favors speed over code size.
;; This is perhaps an interesting reason to make expansion policy-sensitive.
;; I'll test a case that definitely triggers the IR1 transform.
(defun list-backq-expr (l1) `(,@l1 ,most-positive-fixnum a))
(defun obviously-constant-list () '(#.most-positive-fixnum a))
(defun vector-backq-expr () `#(foo ,char-code-limit)) ; no xform, but folded
(defun obviously-constant-vector () #(foo #.char-code-limit))
(with-test (:name :backquote-ir1-simplifier)
;; The pre-tests show that the backquoted expression did not compress
;; (,char-code-limit x) into a constant, nor for the vector.
;; Thus the IR1 optimization must do it in order for this test to pass.
(assert (equal (macroexpand '`(,@l1 ,char-code-limit x))
'(APPEND l1 (LIST* char-code-limit '(X)))))
(assert (equal (macroexpand '`#(,char-code-limit foo))
'(VECTOR char-code-limit 'foo)))
(assert (eq (obviously-constant-list) (list-backq-expr nil)))
;; FIXME: do we not coalesce vector constants? I thought this should pass.
#+nil
(assert (eq (obviously-constant-vector) (vector-backq-expr)))
;; Compiled code should reference a constant vector.
(assert (member (vector 'foo char-code-limit)
(ctu:find-code-constants #'vector-backq-expr)
:test #'equalp)))
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