0.8.3.54:

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

diff --git a/tests/arith.pure.lisp b/tests/arith.pure.lisp
index c2f0ac0..3452abe 100644 (file)
--- a/tests/arith.pure.lisp
+++ b/tests/arith.pure.lisp
@@ -81,5 +81,67 @@
               (assert (<= exact-q q))
               (assert (< q (1+ exact-q))))))
 
-;; CEILING had a corner case, spotted by Paul Dietz
+;;; CEILING had a corner case, spotted by Paul Dietz
 (assert (= (ceiling most-negative-fixnum (1+ most-positive-fixnum)) -1))
+
+;;; give any optimizers of constant multiplication a light testing.
+;;; 100 may seem low, but (a) it caught CSR's initial errors, and (b)
+;;; before checking in, CSR tested with 10000.  So one hundred
+;;; checkins later, we'll have doubled the coverage.
+(dotimes (i 100)
+  (let* ((x (random most-positive-fixnum))
+        (x2 (* x 2))
+        (x3 (* x 3)))
+    (let ((fn (handler-bind ((sb-ext:compiler-note #'error))
+               (compile nil
+                        `(lambda (y)
+                           (declare (optimize speed) (type (integer 0 3) y))
+                           (* y ,x))))))
+      (unless (and (= (funcall fn 0) 0)
+                  (= (funcall fn 1) x)
+                  (= (funcall fn 2) x2)
+                  (= (funcall fn 3) x3))
+       (error "bad results for ~D" x)))))
+
+;;; Bugs reported by Paul Dietz:
+
+;;; (GCD 0 x) must return (abs x)
+(dolist (x (list -10 (* 3 most-negative-fixnum)))
+  (assert (= (gcd 0 x) (abs x))))
+;;; LCM returns a non-negative number
+(assert (= (lcm 4 -10) 20))
+(assert (= (lcm 0 0) 0))
+
+;;; PPC bignum arithmetic bug:
+(multiple-value-bind (quo rem)
+    (truncate 291351647815394962053040658028983955 10000000000000000000000000)
+  (assert (= quo 29135164781))
+  (assert (= rem 5394962053040658028983955)))
+
+;;; x86 LEA bug:
+(assert (= (funcall
+           (compile nil '(lambda (x) (declare (bit x)) (+ x #xf0000000)))
+           1)
+          #xf0000001))
+
+;;; LOGBITP on bignums:
+(dolist (x '(((1+ most-positive-fixnum) 1 nil)
+            ((1+ most-positive-fixnum) -1 t)
+            ((1+ most-positive-fixnum) (1+ most-positive-fixnum) nil)
+            ((1+ most-positive-fixnum) (1- most-negative-fixnum) t)
+            (1 (ash most-negative-fixnum 1) nil)
+            (29 most-negative-fixnum t)
+            (30 (ash most-negative-fixnum 1) t)
+            (31 (ash most-negative-fixnum 1) t)
+            (64 (ash most-negative-fixnum 36) nil)
+            (65 (ash most-negative-fixnum 36) t)))
+  (destructuring-bind (index int result) x
+    (assert (eq (eval `(logbitp ,index ,int)) result))))
+
+;;; off-by-1 type inference error for %DPB and %DEPOSIT-FIELD:
+(let ((f (compile nil '(lambda (b)
+                        (integer-length (dpb b (byte 4 28) -1005))))))
+  (assert (= (funcall f 1230070) 32)))
+(let ((f (compile nil '(lambda (b)
+                        (integer-length (deposit-field b (byte 4 28) -1005))))))
+  (assert (= (funcall f 1230070) 32)))