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 9636b51e303de9b024ce96ce5ff14e0357b03ab0..06cd12f491292459bf8afb03b42014a0f31052c8 100644 (file)
--- a/include/llvm/CodeGen/FunctionLoweringInfo.h
+++ b/include/llvm/CodeGen/FunctionLoweringInfo.h
@@ -21,6 +21,7 @@
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/CodeGen/MachineBasicBlock.h"
+#include "llvm/CodeGen/ISDOpcodes.h"
 #include "llvm/IR/InlineAsm.h"
 #include "llvm/IR/Instructions.h"
 #include "llvm/Target/TargetRegisterInfo.h"
@@ -50,10 +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
@@ -87,6 +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;
 
@@ -106,6 +113,10 @@ public:
                     KnownZero(1, 0) {}
   };
 
+  /// Record the preferred extend type (ISD::SIGN_EXTEND or ISD::ZERO_EXTEND)
+  /// for a value.
+  DenseMap<const Value *, ISD::NodeType> PreferredExtendType;
+
   /// VisitedBBs - The set of basic blocks visited thus far by instruction
   /// selection.
   SmallPtrSet<const BasicBlock*, 4> VisitedBBs;
@@ -115,14 +126,13 @@ public:
   /// TODO: This isn't per-function state, it's per-basic-block state. But
   /// there's no other convenient place for it to live right now.
   std::vector<std::pair<MachineInstr*, unsigned> > PHINodesToUpdate;
+  unsigned OrigNumPHINodesToUpdate;
 
   /// If the current MBB is a landing pad, the exception pointer and exception
   /// selector registers are copied into these virtual registers by
   /// SelectionDAGISel::PrepareEHLandingPad().
   unsigned ExceptionPointerVirtReg, ExceptionSelectorVirtReg;
 
-  explicit FunctionLoweringInfo(const TargetMachine &TM) : TM(TM) {}
-
   /// set - Initialize this FunctionLoweringInfo with the given Function
   /// and its associated MachineFunction.
   ///
@@ -196,6 +206,9 @@ public:
       return;
 
     unsigned Reg = It->second;
+    if (Reg == 0)
+      return;
+
     LiveOutRegInfo.grow(Reg);
     LiveOutRegInfo[Reg].IsValid = false;
   }