/// which trades away generated code quality in favor of reducing
/// compile time.
extern bool EnableFastISel;
+
+ /// StrongPHIElim - This flag enables more aggressive PHI elimination
+ /// wth earlier copy coalescing.
+ extern bool StrongPHIElim;
} // End llvm namespace
#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetOptions.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/ADT/Statistic.h"
AU.addRequired<LiveVariables>();
AU.addPreservedID(MachineLoopInfoID);
AU.addPreservedID(MachineDominatorsID);
- AU.addPreservedID(PHIEliminationID);
- AU.addRequiredID(PHIEliminationID);
+
+ if (!StrongPHIElim) {
+ AU.addPreservedID(PHIEliminationID);
+ AU.addRequiredID(PHIEliminationID);
+ }
+
AU.addRequiredID(TwoAddressInstructionPassID);
MachineFunctionPass::getAnalysisUsage(AU);
}
#include "llvm/CodeGen/RegisterCoalescer.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/ADT/EquivalenceClasses.h"
#include "llvm/ADT/Statistic.h"
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<LiveIntervals>();
+ if (StrongPHIElim)
+ AU.addRequiredID(StrongPHIEliminationID);
// Make sure PassManager knows which analyses to make available
// to coalescing and which analyses coalescing invalidates.
AU.addRequiredTransitive<RegisterCoalescer>();
#include "llvm/CodeGen/RegisterCoalescer.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetOptions.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/ADT/SmallSet.h"
AU.addRequired<MachineLoopInfo>();
AU.addPreserved<MachineLoopInfo>();
AU.addPreservedID(MachineDominatorsID);
- AU.addPreservedID(PHIEliminationID);
+ if (StrongPHIElim)
+ AU.addPreservedID(StrongPHIEliminationID);
+ else
+ AU.addPreservedID(PHIEliminationID);
AU.addPreservedID(TwoAddressInstructionPassID);
MachineFunctionPass::getAnalysisUsage(AU);
}
#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetOptions.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
#include "llvm/ADT/BitVector.h"
AU.addPreserved<LiveVariables>();
AU.addPreservedID(MachineLoopInfoID);
AU.addPreservedID(MachineDominatorsID);
- AU.addPreservedID(PHIEliminationID);
+ if (StrongPHIElim)
+ AU.addPreservedID(StrongPHIEliminationID);
+ else
+ AU.addPreservedID(PHIEliminationID);
MachineFunctionPass::getAnalysisUsage(AU);
}
bool RealignStack;
bool VerboseAsm;
bool DisableJumpTables;
+ bool StrongPHIElim;
}
static cl::opt<bool, true> PrintCode("print-machineinstrs",
cl::location(DisableJumpTables),
cl::init(false));
+static cl::opt<bool, true>
+EnableStrongPHIElim(cl::Hidden, "strong-phi-elim",
+ cl::desc("Use strong PHI elimination."),
+ cl::location(StrongPHIElim),
+ cl::init(false));
+
//---------------------------------------------------------------------------
// TargetMachine Class
//