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diff --git a/contrib/sb-rotate-byte/x86-64-vm.lisp b/contrib/sb-rotate-byte/x86-64-vm.lisp
new file mode 100644
index 0000000..d45b596
--- /dev/null
+++ b/contrib/sb-rotate-byte/x86-64-vm.lisp
@@ -0,0 +1,86 @@
+(in-package "SB-ROTATE-BYTE")
+
+
+;;; 32-bit rotates
+
+(define-vop (%32bit-rotate-byte/c)
+  (:policy :fast-safe)
+  (:translate %unsigned-32-rotate-byte)
+  (:note "inline 32-bit constant rotation")
+  (:args (integer :scs (sb-vm::unsigned-reg) :target result))
+  (:info count)
+  (:arg-types (:constant (integer -31 31)) sb-vm::unsigned-num)
+  (:results (result :scs (sb-vm::unsigned-reg)))
+  (:result-types sb-vm::unsigned-num)
+  (:generator 5
+    (aver (not (= count 0)))
+    (move result integer)
+    (if (> count 0)
+        (inst rol (sb-vm::reg-in-size result :dword) count)
+        (inst ror (sb-vm::reg-in-size result :dword) count))))
+
+(define-vop (%32bit-rotate-byte)
+  (:policy :fast-safe)
+  (:translate %unsigned-32-rotate-byte)
+  (:args (count :scs (sb-vm::signed-reg) :target rcx)
+         (integer :scs (sb-vm::unsigned-reg) :target result))
+  (:arg-types sb-vm::tagged-num sb-vm::unsigned-num)
+  (:temporary (:sc sb-vm::signed-reg :offset sb-vm::rcx-offset)
+              rcx)
+  (:results (result :scs (sb-vm::unsigned-reg) :from :load))
+  (:result-types sb-vm::unsigned-num)
+  (:generator 10
+    (let ((label (gen-label))
+          (end (gen-label)))
+      (move result integer)
+      (move rcx count)
+      (inst cmp (sb-vm::reg-in-size rcx :dword) 0)
+      (inst jmp :ge label)
+      (inst neg (sb-vm::reg-in-size rcx :dword))
+      (inst ror (sb-vm::reg-in-size result :dword) :cl)
+      (inst jmp end)
+      (emit-label label)
+      (inst rol (sb-vm::reg-in-size result :dword) :cl)
+      (emit-label end))))
+
+;;; 64-bit rotates
+
+(define-vop (%64bit-rotate-byte/c)
+  (:policy :fast-safe)
+  (:translate %unsigned-64-rotate-byte)
+  (:note "inline 64-bit constant rotation")
+  (:args (integer :scs (sb-vm::unsigned-reg) :target result))
+  (:info count)
+  (:arg-types (:constant (integer -63 63)) sb-vm::unsigned-num)
+  (:results (result :scs (sb-vm::unsigned-reg)))
+  (:result-types sb-vm::unsigned-num)
+  (:generator 5
+    (aver (not (= count 0)))
+    (move result integer)
+    (if (> count 0)
+        (inst rol result count)
+        (inst ror result count))))
+
+(define-vop (%64bit-rotate-byte)
+  (:policy :fast-safe)
+  (:translate %unsigned-64-rotate-byte)
+  (:args (count :scs (sb-vm::signed-reg) :target rcx)
+         (integer :scs (sb-vm::unsigned-reg) :target result))
+  (:arg-types sb-vm::tagged-num sb-vm::unsigned-num)
+  (:temporary (:sc sb-vm::signed-reg :offset sb-vm::rcx-offset)
+              rcx)
+  (:results (result :scs (sb-vm::unsigned-reg) :from :load))
+  (:result-types sb-vm::unsigned-num)
+  (:generator 10
+    (let ((label (gen-label))
+          (end (gen-label)))
+      (move result integer)
+      (move rcx count)
+      (inst cmp rcx 0)
+      (inst jmp :ge label)
+      (inst neg rcx)
+      (inst ror result :cl)
+      (inst jmp end)
+      (emit-label label)
+      (inst rol result :cl)
+      (emit-label end))))