Subzero: Improve performance of liveness analysis and live range construction.

src/IceTargetLoweringX8632.h

 //===- subzero/src/IceTargetLoweringX8632.h - x86-32 lowering ---*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares the TargetLoweringX8632 class, which
@@ skipping 229 matching lines @@
   void _cmpps(Variable *Dest, Operand *Src0, CondX86::CmppsCond Condition) {
     Context.insert(InstX8632Cmpps::create(Func, Dest, Src0, Condition));
   }
   void _cmpxchg(Operand *DestOrAddr, Variable *Eax, Variable *Desired,
                 bool Locked) {
     Context.insert(
         InstX8632Cmpxchg::create(Func, DestOrAddr, Eax, Desired, Locked));
     // Mark eax as possibly modified by cmpxchg.
     Context.insert(
         InstFakeDef::create(Func, Eax, llvm::dyn_cast<Variable>(DestOrAddr)));
+    _set_dest_nonkillable();
   }
   void _cmpxchg8b(OperandX8632Mem *Addr, Variable *Edx, Variable *Eax,
                   Variable *Ecx, Variable *Ebx, bool Locked) {
     Context.insert(
         InstX8632Cmpxchg8b::create(Func, Addr, Edx, Eax, Ecx, Ebx, Locked));
     // Mark edx, and eax as possibly modified by cmpxchg8b.
     Context.insert(InstFakeDef::create(Func, Edx));
+    _set_dest_nonkillable();
     Context.insert(InstFakeDef::create(Func, Eax));
+    _set_dest_nonkillable();
   }
   void _cvt(Variable *Dest, Operand *Src0, InstX8632Cvt::CvtVariant Variant) {
     Context.insert(InstX8632Cvt::create(Func, Dest, Src0, Variant));
   }
   void _div(Variable *Dest, Operand *Src0, Operand *Src1) {
     Context.insert(InstX8632Div::create(Func, Dest, Src0, Src1));
   }
   void _divps(Variable *Dest, Operand *Src0) {
     Context.insert(InstX8632Divps::create(Func, Dest, Src0));
   }
@@ skipping 19 matching lines @@
   void _mfence() { Context.insert(InstX8632Mfence::create(Func)); }
   // If Dest=NULL is passed in, then a new variable is created, marked
   // as infinite register allocation weight, and returned through the
   // in/out Dest argument.
   void _mov(Variable *&Dest, Operand *Src0,
             int32_t RegNum = Variable::NoRegister) {
     if (Dest == NULL)
       Dest = makeReg(Src0->getType(), RegNum);
     Context.insert(InstX8632Mov::create(Func, Dest, Src0));
   }
+  void _mov_nonkillable(Variable *Dest, Operand *Src0) {
+    Inst *NewInst = InstX8632Mov::create(Func, Dest, Src0);
+    NewInst->setDestNonKillable();
+    Context.insert(NewInst);
+  }
   void _movd(Variable *Dest, Operand *Src0) {
     Context.insert(InstX8632Movd::create(Func, Dest, Src0));
   }
   void _movp(Variable *Dest, Operand *Src0) {
     Context.insert(InstX8632Movp::create(Func, Dest, Src0));
   }
   void _movq(Variable *Dest, Operand *Src0) {
     Context.insert(InstX8632Movq::create(Func, Dest, Src0));
   }
   void _movss(Variable *Dest, Variable *Src0) {
@@ skipping 131 matching lines @@
   void _ucomiss(Operand *Src0, Operand *Src1) {
     Context.insert(InstX8632Ucomiss::create(Func, Src0, Src1));
   }
   void _ud2() { Context.insert(InstX8632UD2::create(Func)); }
   void _xadd(Operand *Dest, Variable *Src, bool Locked) {
     Context.insert(InstX8632Xadd::create(Func, Dest, Src, Locked));
     // The xadd exchanges Dest and Src (modifying Src).
     // Model that update with a FakeDef.
     Context.insert(
         InstFakeDef::create(Func, Src, llvm::dyn_cast<Variable>(Dest)));
+    _set_dest_nonkillable();
   }
   void _xchg(Operand *Dest, Variable *Src) {
     Context.insert(InstX8632Xchg::create(Func, Dest, Src));
     // The xchg modifies Dest and Src -- model that update with a FakeDef.
     Context.insert(
         InstFakeDef::create(Func, Src, llvm::dyn_cast<Variable>(Dest)));
+    _set_dest_nonkillable();
   }
   void _xor(Variable *Dest, Operand *Src0) {
     Context.insert(InstX8632Xor::create(Func, Dest, Src0));
   }
+  void _set_dest_nonkillable() {
+    Context.getLastInserted()->setDestNonKillable();
+  }
 
   const X86InstructionSet InstructionSet;
   bool IsEbpBasedFrame;
   bool NeedsStackAlignment;
   size_t FrameSizeLocals;
   size_t SpillAreaSizeBytes;
   llvm::SmallBitVector TypeToRegisterSet[IceType_NUM];
   llvm::SmallBitVector ScratchRegs;
   llvm::SmallBitVector RegsUsed;
   SizeT NextLabelNumber;
@@ skipping 26 matching lines @@
 };
 
 template <> void ConstantInteger32::emit(GlobalContext *Ctx) const;
 template <> void ConstantInteger64::emit(GlobalContext *Ctx) const;
 template <> void ConstantFloat::emit(GlobalContext *Ctx) const;
 template <> void ConstantDouble::emit(GlobalContext *Ctx) const;
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGX8632_H