#ifndef NDEBUG
#include "llvm/ADT/SmallSet.h"
#endif
+#include "llvm/Analysis/BranchProbabilityInfo.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/CodeGen/ISDOpcodes.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
const Function *Fn;
MachineFunction *MF;
MachineRegisterInfo *RegInfo;
-
+ BranchProbabilityInfo *BPI;
/// CanLowerReturn - true iff the function's return value can be lowered to
/// registers.
bool CanLowerReturn;
#endif
struct LiveOutInfo {
- unsigned NumSignBits;
+ unsigned NumSignBits : 31;
+ bool IsValid : 1;
APInt KnownOne, KnownZero;
- LiveOutInfo() : NumSignBits(0), KnownOne(1, 0), KnownZero(1, 0) {}
+ LiveOutInfo() : NumSignBits(0), IsValid(true), KnownOne(1, 0),
+ KnownZero(1, 0) {}
};
+ /// VisitedBBs - The set of basic blocks visited thus far by instruction
+ /// selection.
+ DenseSet<const BasicBlock*> VisitedBBs;
+
/// PHINodesToUpdate - A list of phi instructions whose operand list will
/// be updated after processing the current basic block.
/// TODO: This isn't per-function state, it's per-basic-block state. But
unsigned CreateReg(EVT VT);
- unsigned CreateRegs(const Type *Ty);
+ unsigned CreateRegs(Type *Ty);
unsigned InitializeRegForValue(const Value *V) {
unsigned &R = ValueMap[V];
const LiveOutInfo *GetLiveOutRegInfo(unsigned Reg) {
if (!LiveOutRegInfo.inBounds(Reg))
return NULL;
- return &LiveOutRegInfo[Reg];
+
+ const LiveOutInfo *LOI = &LiveOutRegInfo[Reg];
+ if (!LOI->IsValid)
+ return NULL;
+
+ return LOI;
}
+ /// GetLiveOutRegInfo - Gets LiveOutInfo for a register, returning NULL if the
+ /// register is a PHI destination and the PHI's LiveOutInfo is not valid. If
+ /// the register's LiveOutInfo is for a smaller bit width, it is extended to
+ /// the larger bit width by zero extension. The bit width must be no smaller
+ /// than the LiveOutInfo's existing bit width.
+ const LiveOutInfo *GetLiveOutRegInfo(unsigned Reg, unsigned BitWidth);
+
/// AddLiveOutRegInfo - Adds LiveOutInfo for a register.
void AddLiveOutRegInfo(unsigned Reg, unsigned NumSignBits,
const APInt &KnownZero, const APInt &KnownOne) {
LOI.KnownZero = KnownZero;
}
+ /// ComputePHILiveOutRegInfo - Compute LiveOutInfo for a PHI's destination
+ /// register based on the LiveOutInfo of its operands.
+ void ComputePHILiveOutRegInfo(const PHINode*);
+
+ /// InvalidatePHILiveOutRegInfo - Invalidates a PHI's LiveOutInfo, to be
+ /// called when a block is visited before all of its predecessors.
+ void InvalidatePHILiveOutRegInfo(const PHINode *PN) {
+ // PHIs with no uses have no ValueMap entry.
+ DenseMap<const Value*, unsigned>::const_iterator It = ValueMap.find(PN);
+ if (It == ValueMap.end())
+ return;
+
+ unsigned Reg = It->second;
+ LiveOutRegInfo.grow(Reg);
+ LiveOutRegInfo[Reg].IsValid = false;
+ }
+
/// setByValArgumentFrameIndex - Record frame index for the byval
/// argument.
void setByValArgumentFrameIndex(const Argument *A, int FI);
void AddCatchInfo(const CallInst &I,
MachineModuleInfo *MMI, MachineBasicBlock *MBB);
-/// CopyCatchInfo - Copy catch information from DestBB to SrcBB.
-void CopyCatchInfo(const BasicBlock *SrcBB, const BasicBlock *DestBB,
+/// CopyCatchInfo - Copy catch information from SuccBB (or one of its
+/// successors) to LPad.
+void CopyCatchInfo(const BasicBlock *SuccBB, const BasicBlock *LPad,
MachineModuleInfo *MMI, FunctionLoweringInfo &FLI);
} // end namespace llvm