Subzero. x8664. Resurrects the Target.

src/IceRegAlloc.cpp

 //===- subzero/src/IceRegAlloc.cpp - Linear-scan implementation -----------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 820 matching lines @@
 
   // Allocate memory once outside the loop.
   IterationState Iter;
   Iter.Weights.reserve(NumRegisters);
   Iter.PrecoloredUnhandledMask.reserve(NumRegisters);
 
   while (!Unhandled.empty()) {
     Iter.Cur = Unhandled.back();
     Unhandled.pop_back();
     dumpLiveRangeTrace("\nConsidering  ", Iter.Cur);
+    assert(Target->getRegistersForVariable(Iter.Cur).any());
     Iter.RegMask = RegMaskFull & Target->getRegistersForVariable(Iter.Cur);
     KillsRange.trim(Iter.Cur->getLiveRange().getStart());
 
     // Check for pre-colored ranges. If Cur is pre-colored, it definitely gets
     // that register. Previously processed live ranges would have avoided that
     // register due to it being pre-colored. Future processed live ranges won't
     // evict that register because the live range has infinite weight.
     if (Iter.Cur->hasReg()) {
       allocatePrecoloredRegister(Iter.Cur);
       continue;
@@ skipping 126 matching lines @@
     Str << "\n";
   }
   Str << "++++++ Inactive:\n";
   for (const Variable *Item : Inactive) {
     dumpLiveRange(Item, Func);
     Str << "\n";
   }
 }
 
 } // end of namespace Ice