0.8.18.36:

[sbcl.git] / src / compiler / x86-64 / array.lisp

diff --git a/src/compiler/x86-64/array.lisp b/src/compiler/x86-64/array.lisp
index 725b457..6a8aebd 100644 (file)
--- a/src/compiler/x86-64/array.lisp
+++ b/src/compiler/x86-64/array.lisp
@@ -269,7 +269,8 @@
                       (mask ,(1- (ash 1 bits)))
                       (shift (* extra ,bits)))
                  (unless (= value mask)
-                   (inst mov mask-tn (lognot (ash mask shift)))
+                   (inst mov mask-tn (ldb (byte 64 0)
+                                          (lognot (ash mask shift))))
                    (inst and old mask-tn))
                  (unless (zerop value)
                    (inst mov mask-tn (ash value shift))