Add TargetRegisterInfo::hasRegUnit().

This trivial helper function tests if a register contains a register
unit. It is similar to regsOverlap(), but with asymmetric arguments.

llvm-svn: 161180

1 files changed, 8 insertions, 0 deletions

diff --git a/llvm/include/llvm/Target/TargetRegisterInfo.h b/llvm/include/llvm/Target/TargetRegisterInfo.h
index a70b8f6cbdb..df4d900e4c8 100644
--- a/llvm/include/llvm/Target/TargetRegisterInfo.h
+++ b/llvm/include/llvm/Target/TargetRegisterInfo.h
@@ -349,6 +349,14 @@ public:
     return false;
   }
 
+  /// hasRegUnit - Returns true if Reg contains RegUnit.
+  bool hasRegUnit(unsigned Reg, unsigned RegUnit) const {
+    for (MCRegUnitIterator Units(Reg, this); Units.isValid(); ++Units)
+      if (*Units == RegUnit)
+        return true;
+    return false;
+  }
+
   /// isSubRegister - Returns true if regB is a sub-register of regA.
   ///
   bool isSubRegister(unsigned regA, unsigned regB) const {