Remove floating point killer pass. This is now implemented in the

instruction selector by adding a new pseudo-instruction
FP_REG_KILL. This instruction implicitly defines all x86 fp registers
and is a terminator so that passes which add machine code at the end
of basic blocks (like phi elimination) do not add instructions between
it and the branch or return instruction.

llvm-svn: 10562

1 files changed, 0 insertions, 52 deletions

diff --git a/llvm/lib/Target/X86/FloatingPoint.cpp b/llvm/lib/Target/X86/FloatingPoint.cpp
index b8934769965..8673fd61cdb 100644
--- a/llvm/lib/Target/X86/FloatingPoint.cpp
+++ b/llvm/lib/Target/X86/FloatingPoint.cpp
@@ -603,55 +603,3 @@ void FPS::handleSpecialFP(MachineBasicBlock::iterator &I) {
   I = MBB->erase(I)-1;  // Remove the pseudo instruction
   delete MI;
 }
-
-namespace {
-  struct FPK : public MachineFunctionPass {
-    virtual const char *getPassName() const { return "X86 FP Killer"; }
-    virtual bool runOnMachineFunction(MachineFunction &MF);
-      virtual void getAnalysisUsage(AnalysisUsage &AU) const {
-          AU.addPreserved<LiveVariables>();
-          AU.addRequired<LiveVariables>();
-          AU.addPreservedID(PHIEliminationID);
-          AU.addRequiredID(PHIEliminationID);
-          MachineFunctionPass::getAnalysisUsage(AU);
-      }
-  };
-}
-
-FunctionPass *llvm::createX86FloatingPointKillerPass() { return new FPK(); }
-
-bool FPK::runOnMachineFunction(MachineFunction &MF) {
-  const TargetInstrInfo& tii = MF.getTarget().getInstrInfo();;
-  LiveVariables &LV = getAnalysis<LiveVariables>();
-
-  for (MachineFunction::iterator
-           mbbi = MF.begin(), mbbe = MF.end(); mbbi != mbbe; ++mbbi) {
-    MachineBasicBlock& mbb = *mbbi;
-    MachineBasicBlock::reverse_iterator mii = mbb.rbegin();
-    // rewind to the last non terminating instruction
-    while (mii != mbb.rend() && tii.isTerminatorInstr((*mii)->getOpcode()))
-      ++mii;
-
-    // add implicit def for all virtual floating point registers so that
-    // they are spilled at the end of each basic block, since our
-    // register stackifier doesn't handle them otherwise.
-    MachineInstr* instr = BuildMI(X86::IMPLICIT_DEF, 7)
-        .addReg(X86::FP6, MOTy::Def)
-        .addReg(X86::FP5, MOTy::Def)
-        .addReg(X86::FP4, MOTy::Def)
-        .addReg(X86::FP3, MOTy::Def)
-        .addReg(X86::FP2, MOTy::Def)
-        .addReg(X86::FP1, MOTy::Def)
-        .addReg(X86::FP0, MOTy::Def);
-        
-    mbb.insert(mii.base(), instr);
-
-    for (unsigned i = 0; i < instr->getNumOperands(); ++i) {
-      LV.HandlePhysRegDef(instr->getOperand(i).getAllocatedRegNum(), instr);
-
-      // force live variables to compute that these registers are dead
-      LV.HandlePhysRegDef(instr->getOperand(i).getAllocatedRegNum(), 0);
-    }
-  }
-  return true;
-}