diff -r b7440ef162a5 pypy/jit/backend/ppc/ppcgen/ppc_assembler.py
--- a/pypy/jit/backend/ppc/ppcgen/ppc_assembler.py	Thu Aug 11 11:18:01 2011 +0200
+++ b/pypy/jit/backend/ppc/ppcgen/ppc_assembler.py	Thu Aug 11 15:28:16 2011 -0400
@@ -445,14 +445,14 @@
     rldcr   = MDS(30, XO5=9, Rc=0)
     rldcrx  = MDS(30, XO5=9, Rc=1)
 
-    rldic   = MDI(30, XO5=2, Rc=0)
-    rldicx  = MDI(30, XO5=2, Rc=1)
-    rldicl  = MDI(30, XO5=0, Rc=0)
-    rldiclx = MDI(30, XO5=0, Rc=1)
-    rldicr  = MDI(30, XO5=1, Rc=0)
-    rldicrx = MDI(30, XO5=1, Rc=1)
-    rldimi  = MDI(30, XO5=3, Rc=0)
-    rldimix = MDI(30, XO5=3, Rc=1)
+    _rldic   = MDI(30, XO5=2, Rc=0)
+    _rldicx  = MDI(30, XO5=2, Rc=1)
+    _rldicl  = MDI(30, XO5=0, Rc=0)
+    _rldiclx = MDI(30, XO5=0, Rc=1)
+    _rldicr  = MDI(30, XO5=1, Rc=0)
+    _rldicrx = MDI(30, XO5=1, Rc=1)
+    _rldimi  = MDI(30, XO5=3, Rc=0)
+    _rldimix = MDI(30, XO5=3, Rc=1)
 
     rlwimi  = MI(20, Rc=0)
     rlwimix = MI(20, Rc=1)
@@ -857,6 +857,30 @@
 
     mtcr = BA.mtcrf(CRM=0xFF)
 
+    def rldic(rA, rS, shift, MB):
+        self._rldic(rA, rS, shift & 31, MB, (shift & 32) >> 5)
+
+    def rldixc(rA, rS, shift, MB):
+        self._rldicx(rA, rS, shift & 31, MB, (shift & 32) >> 5)
+
+    def rldicl(rA, rS, shift, MB):
+        self._rldicl(rA, rS, shift & 31, MB, (shift & 32) >> 5)
+
+    def rldiclx(rA, rS, shift, MB):
+        self._rldiclx(rA, rS, shift & 31, MB, (shift & 32) >> 5)
+
+    def rldicr(rA, rS, shift, ME):
+        self._rldicr(rA, rS, shift & 31, ME, (shift & 32) >> 5)
+
+    def rldicrx(rA, rS, shift, ME):
+        self._rldicrx(rA, rS, shift & 31, ME, (shift & 32) >> 5)
+
+    def rldimi(rA, rS, shift, MB):
+        self._rldicr(rA, rS, shift & 31, MB, (shift & 32) >> 5)
+
+    def rldimix(rA, rS, shift, MB):
+        self._rldicrx(rA, rS, shift & 31, MB, (shift & 32) >> 5)
+
     def emit(self, insn):
         bytes = struct.pack("i", insn)
         for byte in bytes:
diff -r b7440ef162a5 pypy/jit/backend/ppc/ppcgen/ppc_field.py
--- a/pypy/jit/backend/ppc/ppcgen/ppc_field.py	Thu Aug 11 11:18:01 2011 +0200
+++ b/pypy/jit/backend/ppc/ppcgen/ppc_field.py	Thu Aug 11 15:28:16 2011 -0400
@@ -77,17 +77,27 @@
 
 class spr(Field):
     def encode(self, value):
-        value = (value&31) << 5 | (value >> 5 & 31)
+        value = (value & 31) << 5 | (value >> 5 & 31)
         return super(spr, self).encode(value)
     def decode(self, inst):
         value = super(spr, self).decode(inst)
-        return (value&31) << 5 | (value >> 5 & 31)
+        return (value & 31) << 5 | (value >> 5 & 31)
+
+class mbe(Field):
+    def encode(self, value):
+        value = (value & 31) << 1 | (value & 32) >> 5
+        return super(spr, self).encode(value)
+    def decode(self, inst):
+        value = super(mbe, self).decode(inst)
+        return (value & 1) << 5 | (value >> 1 & 31)
 
 # other special fields?
 
 ppc_fields = {
     "LI":  IField("LI", *fields["LI"]),
     "BD":  IField("BD", *fields["BD"]),
+    "ds":  IField("ds", *fields["ds"]),
+    "mbe": mbe("mbe", *fields["mbe"]),
     "spr": spr("spr",   *fields["spr"]),
 }