X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FCodeGen%2FRegisterClassInfo.cpp;h=786d279c2b8c29e0a09a011d49b72fe7fa74a783;hb=80cc2598f89d09a6df2b84a5f8cea813b280b17b;hp=75b0c90be8fc244c8dc15c7b37580c9ccda9a6cd;hpb=7c48913af62ced0da03ba58755cf5f53ad587ba8;p=oota-llvm.git

diff --git a/lib/CodeGen/RegisterClassInfo.cpp b/lib/CodeGen/RegisterClassInfo.cpp
index 75b0c90be8f..786d279c2b8 100644
--- a/lib/CodeGen/RegisterClassInfo.cpp
+++ b/lib/CodeGen/RegisterClassInfo.cpp
@@ -81,11 +81,9 @@ void RegisterClassInfo::compute(const TargetRegisterClass *RC) const {
 
   // FIXME: Once targets reserve registers instead of removing them from the
   // allocation order, we can simply use begin/end here.
-  TargetRegisterClass::iterator AOB = RC->allocation_order_begin(*MF);
-  TargetRegisterClass::iterator AOE = RC->allocation_order_end(*MF);
-
-  for (TargetRegisterClass::iterator I = AOB; I != AOE; ++I) {
-    unsigned PhysReg = *I;
+  ArrayRef<unsigned> RawOrder = RC->getRawAllocationOrder(*MF);
+  for (unsigned i = 0; i != RawOrder.size(); ++i) {
+    unsigned PhysReg = RawOrder[i];
     // Remove reserved registers from the allocation order.
     if (Reserved.test(PhysReg))
       continue;
@@ -101,11 +99,16 @@ void RegisterClassInfo::compute(const TargetRegisterClass *RC) const {
   // CSR aliases go after the volatile registers, preserve the target's order.
   std::copy(CSRAlias.begin(), CSRAlias.end(), &RCI.Order[N]);
 
+  // Check if RC is a proper sub-class.
+  if (const TargetRegisterClass *Super = TRI->getLargestLegalSuperClass(RC))
+    if (Super != RC && getNumAllocatableRegs(Super) > RCI.NumRegs)
+      RCI.ProperSubClass = true;
+
   DEBUG({
     dbgs() << "AllocationOrder(" << RC->getName() << ") = [";
-    for (unsigned I = 0; I != N; ++I)
+    for (unsigned I = 0; I != RCI.NumRegs; ++I)
       dbgs() << ' ' << PrintReg(RCI.Order[I], TRI);
-    dbgs() << " ]\n";
+    dbgs() << (RCI.ProperSubClass ? " ] (sub-class)\n" : " ]\n");
   });
 
   // RCI is now up-to-date.