CodeGen: do not attempt to invalidate virtual registers for zero-sized phis.

[oota-llvm.git] / include / llvm / CodeGen / FunctionLoweringInfo.h

diff --git a/include/llvm/CodeGen/FunctionLoweringInfo.h b/include/llvm/CodeGen/FunctionLoweringInfo.h
index e94c10569f3b8eb5a317a9dc04fcd126819ed464..06cd12f491292459bf8afb03b42014a0f31052c8 100644 (file)
--- a/include/llvm/CodeGen/FunctionLoweringInfo.h
+++ b/include/llvm/CodeGen/FunctionLoweringInfo.h
@@ -51,10 +51,10 @@ class Value;
 /// function that is used when lowering a region of the function.
 ///
 class FunctionLoweringInfo {
-  const TargetMachine &TM;
 public:
   const Function *Fn;
   MachineFunction *MF;
+  const TargetLowering *TLI;
   MachineRegisterInfo *RegInfo;
   BranchProbabilityInfo *BPI;
   /// CanLowerReturn - true iff the function's return value can be lowered to
@@ -88,6 +88,12 @@ public:
   /// RegFixups - Registers which need to be replaced after isel is done.
   DenseMap<unsigned, unsigned> RegFixups;
 
+  /// StatepointStackSlots - A list of temporary stack slots (frame indices) 
+  /// used to spill values at a statepoint.  We store them here to enable
+  /// reuse of the same stack slots across different statepoints in different
+  /// basic blocks.
+  SmallVector<unsigned, 50> StatepointStackSlots;
+
   /// MBB - The current block.
   MachineBasicBlock *MBB;
 
@@ -127,8 +133,6 @@ public:
   /// SelectionDAGISel::PrepareEHLandingPad().
   unsigned ExceptionPointerVirtReg, ExceptionSelectorVirtReg;
 
-  explicit FunctionLoweringInfo(const TargetMachine &TM) : TM(TM) {}
-
   /// set - Initialize this FunctionLoweringInfo with the given Function
   /// and its associated MachineFunction.
   ///
@@ -202,6 +206,9 @@ public:
       return;
 
     unsigned Reg = It->second;
+    if (Reg == 0)
+      return;
+
     LiveOutRegInfo.grow(Reg);
     LiveOutRegInfo[Reg].IsValid = false;
   }