X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FCodeGen%2FRegisterClassInfo.h;h=2c1407096cd7f43f392272439413d2be14ad2d09;hb=80cc2598f89d09a6df2b84a5f8cea813b280b17b;hp=d21fd67efe8b0271c400397ee0a9ea8409ebc129;hpb=a347f85dbeee37a7f2bb68df1a7d4cdfbb7b576d;p=oota-llvm.git

diff --git a/lib/CodeGen/RegisterClassInfo.h b/lib/CodeGen/RegisterClassInfo.h
index d21fd67efe8..2c1407096cd 100644
--- a/lib/CodeGen/RegisterClassInfo.h
+++ b/lib/CodeGen/RegisterClassInfo.h
@@ -28,11 +28,12 @@ class RegisterClassInfo {
   struct RCInfo {
     unsigned Tag;
     unsigned NumRegs;
+    bool ProperSubClass;
     OwningArrayPtr<unsigned> Order;
 
-    RCInfo() : Tag(0), NumRegs(0) {}
+    RCInfo() : Tag(0), NumRegs(0), ProperSubClass(false) {}
     operator ArrayRef<unsigned>() const {
-      return ArrayRef<unsigned>(Order.get(), NumRegs);
+      return makeArrayRef(Order.get(), NumRegs);
     }
   };
 
@@ -87,6 +88,16 @@ public:
     return get(RC);
   }
 
+  /// isProperSubClass - Returns true if RC has a legal super-class with more
+  /// allocatable registers.
+  ///
+  /// Register classes like GR32_NOSP are not proper sub-classes because %esp
+  /// is not allocatable.  Similarly, tGPR is not a proper sub-class in Thumb
+  /// mode because the GPR super-class is not legal.
+  bool isProperSubClass(const TargetRegisterClass *RC) const {
+    return get(RC).ProperSubClass;
+  }
+
   /// getLastCalleeSavedAlias - Returns the last callee saved register that
   /// overlaps PhysReg, or 0 if Reg doesn't overlap a CSR.
   unsigned getLastCalleeSavedAlias(unsigned PhysReg) const {