1.0.44.1: more conservative CONCATENATE open-coding

[sbcl.git] / tests / compiler.pure.lisp

diff --git a/tests/compiler.pure.lisp b/tests/compiler.pure.lisp
index 90b460e..fbadfe9 100644 (file)
--- a/tests/compiler.pure.lisp
+++ b/tests/compiler.pure.lisp
@@ -3655,3 +3655,29 @@
     (assert (equal (with-output-to-string (*standard-output*)
                      (funcall fun t))
                    "(1 2)T"))))
+
+(with-test (:name :constant-concatenate-compile-time)
+  (flet ((make-lambda (n)
+           `(lambda (x)
+              (declare (optimize (speed 3) (space 0)))
+              (concatenate 'string x ,(make-string n)))))
+    (let* ((l0 (make-lambda 1))
+           (l1 (make-lambda 10))
+           (l2 (make-lambda 100))
+           (l3 (make-lambda 1000))
+           (t0 (get-internal-run-time))
+           (f0 (compile nil l0))
+           (t1 (get-internal-run-time))
+           (f1 (compile nil l1))
+           (t2 (get-internal-run-time))
+           (f2 (compile nil l2))
+           (t3 (get-internal-run-time))
+           (f3 (compile nil l3))
+           (t4 (get-internal-run-time))
+           (d0 (- t1 t0))
+           (d1 (- t2 t1))
+           (d2 (- t3 t2))
+           (d3 (- t4 t3))
+           (short-avg (/ (+ d0 d1 d2) 3)))
+      (assert (and f1 f2 f3))
+      (assert (< d3 (* 10 short-avg))))))