Index: greenlet-0.3.1/platform/switch_ppc_unix.h
===================================================================
--- greenlet-0.3.1.orig/platform/switch_ppc_unix.h
+++ greenlet-0.3.1/platform/switch_ppc_unix.h
@@ -42,7 +42,7 @@
  * is meant to be compiled non-dynamically!
  */
 #define REGS_TO_SAVE "r13", "r14", "r15", "r16", "r17", "r18", "r19", "r20", \
-       "r21", "r22", "r23", "r24", "r25", "r26", "r27", "r28", "r29", \
+       "r21", "r22", "r23", "r24", "r25", "r26", "r27", "r28", "r29", "r31", \
        "cr2", "cr3", "cr4"
 static int
 slp_switch(void)
@@ -55,7 +55,6 @@ slp_switch(void)
         __asm__ volatile (
             "mr 11, %0\n"
             "add 1, 1, 11\n"
-            "add 30, 30, 11\n"
             : /* no outputs */
             : "g" (stsizediff)
             : "11"