Don't try to form FGETSIGN after legalization; it is possible in some cases, but...

[oota-llvm.git] / lib / CodeGen / RegAllocGreedy.cpp

diff --git a/lib/CodeGen/RegAllocGreedy.cpp b/lib/CodeGen/RegAllocGreedy.cpp
index 08767a0d0524321b9cbeb1a53545cddefa44b8a6..366c94e2f47d0432f6bb166a4b8f275ce66cc527 100644 (file)
--- a/lib/CodeGen/RegAllocGreedy.cpp
+++ b/lib/CodeGen/RegAllocGreedy.cpp
@@ -248,7 +248,6 @@ public:
   static char ID;
 
 private:
-  void LRE_WillEraseInstruction(MachineInstr*);
   bool LRE_CanEraseVirtReg(unsigned);
   void LRE_WillShrinkVirtReg(unsigned);
   void LRE_DidCloneVirtReg(unsigned, unsigned);
@@ -350,11 +349,6 @@ void RAGreedy::getAnalysisUsage(AnalysisUsage &AU) const {
 //                     LiveRangeEdit delegate methods
 //===----------------------------------------------------------------------===//
 
-void RAGreedy::LRE_WillEraseInstruction(MachineInstr *MI) {
-  // LRE itself will remove from SlotIndexes and parent basic block.
-  VRM->RemoveMachineInstrFromMaps(MI);
-}
-
 bool RAGreedy::LRE_CanEraseVirtReg(unsigned VirtReg) {
   if (unsigned PhysReg = VRM->getPhys(VirtReg)) {
     unassign(LIS->getInterval(VirtReg), PhysReg);
@@ -377,6 +371,10 @@ void RAGreedy::LRE_WillShrinkVirtReg(unsigned VirtReg) {
 }
 
 void RAGreedy::LRE_DidCloneVirtReg(unsigned New, unsigned Old) {
+  // Cloning a register we haven't even heard about yet?  Just ignore it.
+  if (!ExtraRegInfo.inBounds(Old))
+    return;
+
   // LRE may clone a virtual register because dead code elimination causes it to
   // be split into connected components. The new components are much smaller
   // than the original, so they should get a new chance at being assigned.
@@ -1114,6 +1112,8 @@ unsigned RAGreedy::tryRegionSplit(LiveInterval &VirtReg, AllocationOrder &Order,
       }
       --NumCands;
       GlobalCand[Worst] = GlobalCand[NumCands];
+      if (BestCand == NumCands)
+        BestCand = Worst;
     }
 
     if (GlobalCand.size() <= NumCands)