diff -r d43eb1203aec -r 579c565548dc src/arch/power/registers.hh
--- a/src/arch/power/registers.hh	Thu Jun 07 17:03:45 2012 -0500
+++ b/src/arch/power/registers.hh	Fri Jun 08 10:55:47 2012 +0100
@@ -38,7 +38,10 @@
 
 using PowerISAInst::MaxInstSrcRegs;
 using PowerISAInst::MaxInstDestRegs;
-using PowerISAInst::MaxMiscDestRegs;
+
+// Power writes a misc register outside of the isa parser, so it can't
+// be detected by it. Manually add it here.
+const int MaxMiscDestRegs = PowerISAInst::MaxMiscDestRegs + 1;
 
 typedef uint8_t RegIndex;