Don't crash on invalid instructions when disassembling MBlaze code.

This fixes http://llvm.org/bugs/show_bug.cgi?id=9653


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129303 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 20 insertions, 0 deletions

diff --git a/lib/Target/MBlaze/MBlazeRegisterInfo.cpp b/lib/Target/MBlaze/MBlazeRegisterInfo.cpp
index fa9140d792..ed8511df5e 100644
--- a/lib/Target/MBlaze/MBlazeRegisterInfo.cpp
+++ b/lib/Target/MBlaze/MBlazeRegisterInfo.cpp
@@ -181,6 +181,26 @@ unsigned MBlazeRegisterInfo::getSpecialRegisterFromNumbering(unsigned Reg) {
   return 0; // Not reached
 }
 
+bool MBlazeRegisterInfo::isRegister(unsigned Reg) {
+  return Reg <= 31;
+}
+
+bool MBlazeRegisterInfo::isSpecialRegister(unsigned Reg) {
+  switch (Reg) {
+    case 0x0000 : case 0x0001 : case 0x0003 : case 0x0005 : 
+    case 0x0007 : case 0x000B : case 0x000D : case 0x1000 : 
+    case 0x1001 : case 0x1002 : case 0x1003 : case 0x1004 : 
+    case 0x2000 : case 0x2001 : case 0x2002 : case 0x2003 : 
+    case 0x2004 : case 0x2005 : case 0x2006 : case 0x2007 : 
+    case 0x2008 : case 0x2009 : case 0x200A : case 0x200B : 
+      return true;
+
+    default:
+      return false;
+  }
+  return false; // Not reached
+}
+
 unsigned MBlazeRegisterInfo::getPICCallReg() {
   return MBlaze::R20;
 }