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diff --git a/contrib/sb-rotate-byte/ppc-vm.lisp b/contrib/sb-rotate-byte/ppc-vm.lisp
new file mode 100644
index 0000000..294a7d6
--- /dev/null
+++ b/contrib/sb-rotate-byte/ppc-vm.lisp
@@ -0,0 +1,62 @@
+(in-package "SB-ROTATE-BYTE")
+
+(define-vop (%32bit-rotate-byte/c)
+  (:policy :fast-safe)
+  (:translate %unsigned-32-rotate-byte)
+  (:note "inline 32-bit constant rotation")
+  (:info count)
+  (:args (integer :scs (sb-vm::unsigned-reg) :target res))
+  (:arg-types (:constant (integer -31 31)) sb-vm::unsigned-byte-32)
+  (:results (res :scs (sb-vm::unsigned-reg)))
+  (:result-types sb-vm::unsigned-byte-32)
+  (:generator 5
+    ;; the 0 case is an identity operation and should be
+    ;; DEFTRANSFORMed away.
+    (aver (not (= count 0)))
+    (if (> count 0)
+	(inst rotlwi res integer count)
+        (inst rotrwi res integer (- count)))))
+
+(define-vop (%32bit-rotate-byte-fixnum/c)
+  (:policy :fast-safe)
+  (:translate %unsigned-32-rotate-byte)
+  (:note "inline 32-bit constant rotation")
+  (:info count)
+  (:args (integer :scs (sb-vm::any-reg) :target res))
+  (:arg-types (:constant (integer -31 31)) sb-vm::positive-fixnum)
+  (:results (res :scs (sb-vm::unsigned-reg)))
+  (:result-types sb-vm::unsigned-byte-32)
+  (:generator 5
+    (aver (not (= count 0)))
+    (cond
+      ;; FIXME: all these 2s should be n-fixnum-tag-bits.
+      ((= count 2))
+      ((> count 2) (inst rotlwi res integer (- count 2)))
+      (t (inst rotrwi res integer (- 2 count))))))
+
+(macrolet ((def (name arg-type)
+	     `(define-vop (,name)
+	       (:policy :fast-safe)
+	       (:translate %unsigned-32-rotate-byte)
+	       (:note "inline 32-bit rotation")
+	       (:args (count :scs (sb-vm::signed-reg))
+		      (integer :scs (sb-vm::unsigned-reg) :target res))
+	       (:arg-types sb-vm::tagged-num ,arg-type)
+	       (:temporary (:scs (sb-vm::unsigned-reg) :from (:argument 0))
+			   realcount)
+	       (:results (res :scs (sb-vm::unsigned-reg)))
+	       (:result-types sb-vm::unsigned-byte-32)
+	       (:generator 10
+		(let ((label (gen-label))
+		      (end (gen-label)))
+		  (inst cmpwi count 0)
+		  (inst bge label)
+		  (inst addi realcount count 32)
+		  (inst rotlw res integer realcount)
+		  (inst b end)
+		  (emit-label label)
+		  (inst rotlw res integer count)
+		  (emit-label end))))))
+  (def %32bit-rotate-byte sb-vm::unsigned-byte-32)
+  ;; FIXME: see x86-vm.lisp
+  (def %32bit-rotate-byte-fixnum sb-vm::positive-fixnum))