Add MCRegisterInfo::RegListIterator.

Also add subclasses MCSubRegIterator, MCSuperRegIterator, and
MCRegAliasIterator.

These iterators provide an abstract interface to the MCRegisterInfo
register lists so the internal representation can be changed without
changing all clients.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157695 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 4 deletions

diff --git a/include/llvm/Target/TargetRegisterInfo.h b/include/llvm/Target/TargetRegisterInfo.h
index 949fce8461..b792889db8 100644
--- a/include/llvm/Target/TargetRegisterInfo.h
+++ b/include/llvm/Target/TargetRegisterInfo.h
@@ -357,10 +357,10 @@ public:
 
   /// isSuperRegister - Returns true if regB is a super-register of regA.
   ///
-  bool isSuperRegister(unsigned regA, unsigned regB) const {
-    for (const uint16_t *regList = getSuperRegisters(regA); *regList;++regList){
-      if (*regList == regB) return true;
-    }
+  bool isSuperRegister(unsigned RegA, unsigned RegB) const {
+    for (MCSuperRegIterator I(RegA, this); I.isValid(); ++I)
+      if (*I == RegB)
+        return true;
     return false;
   }