X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=contrib%2Fsb-rotate-byte%2Frotate-byte-tests.lisp;h=6e6b7f6059f816ae65885f3259ab0b6408967c87;hb=a37b7e2a4c93398af954c3f03c5412ead1c1c828;hp=518f8cbba2cb24ad9a4c10531fc4c55030f458ae;hpb=4898ef32c639b1c7f4ee13a5ba566ce6debd03e6;p=sbcl.git

diff --git a/contrib/sb-rotate-byte/rotate-byte-tests.lisp b/contrib/sb-rotate-byte/rotate-byte-tests.lisp
index 518f8cb..6e6b7f6 100644
--- a/contrib/sb-rotate-byte/rotate-byte-tests.lisp
+++ b/contrib/sb-rotate-byte/rotate-byte-tests.lisp
@@ -1,5 +1,8 @@
 (in-package "SB-ROTATE-BYTE")
 
+;;; Ensure we don't bug out with an identity rotation.
+(assert (= (rotate-byte 0 (byte 32 0) 3) 3))
+
 (assert (= (rotate-byte 3 (byte 32 0) 3) 24))
 (assert (= (rotate-byte 3 (byte 16 0) 3) 24))
 (assert (= (rotate-byte 3 (byte 2 0) 3) 3))
@@ -51,3 +54,40 @@
 (assert (= (ub32 5 1) 32))
 (assert (= (ub32 5 (ash 1 26)) (ash 1 31)))
 (assert (= (ub32 5 (ash 1 27)) 1))
+
+;;; test with (contrived) register pressure on the x86 to ensure that the
+;;; rotatee doesn't get clobbered by the count.
+
+(defun ub32-reg-pressure (count integer)
+  (declare (type (unsigned-byte 32) integer)
+           (type (integer -31 31) count))
+  (rotate-byte count (byte 32 0) (ldb (byte 32 0) (+ (* 67 count)
+                                                     integer))))
+
+(assert (= (ub32-reg-pressure 1 5) 144))
+(assert (= (ub32-reg-pressure 5 5) 10880))
+(assert (= (ub32-reg-pressure 5 (ash 1 26)) 2147494368))
+(assert (= (ub32-reg-pressure 5 (ash 1 27)) 10721))
+
+(defun ub64/c (integer)
+  (declare (type (unsigned-byte 64) integer))
+  (rotate-byte 6 (byte 64 0) integer))
+
+(defun ub64/-c (integer)
+  (declare (type (unsigned-byte 64) integer))
+  (rotate-byte -6 (byte 64 0) integer))
+
+(assert (= (ub64/-c 320) 5))
+(assert (= (ub64/-c 64) 1))
+(assert (= (ub64/-c (ash 1 63)) (ash 1 57)))
+(assert (= (ub64/-c 1) (ash 1 58)))
+
+(defun ub64 (count integer)
+  (declare (type (unsigned-byte 64) integer)
+           (type (integer -63 63) count))
+  (rotate-byte count (byte 64 0) integer))
+
+(assert (= (ub64 6 5) 320))
+(assert (= (ub64 6 1) 64))
+(assert (= (ub64 6 (ash 1 57)) (ash 1 63)))
+(assert (= (ub64 6 (ash 1 58)) 1))