Subzero: Simplify the FakeKill instruction.

src/IceTargetLoweringX8632.cpp

 //===- subzero/src/IceTargetLoweringX8632.cpp - x86-32 lowering -----------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file implements the TargetLoweringX8632 class, which
@@ skipping 298 matching lines @@
   TypeToRegisterSet[IceType_v16i1] = VectorRegisters;
   TypeToRegisterSet[IceType_v16i8] = VectorRegisters;
   TypeToRegisterSet[IceType_v8i16] = VectorRegisters;
   TypeToRegisterSet[IceType_v4i32] = VectorRegisters;
   TypeToRegisterSet[IceType_v4f32] = VectorRegisters;
 }
 
 void TargetX8632::translateO2() {
   TimerMarker T(TimerStack::TT_O2, Func);
 
-  initFakeKilledScratchRegisters();
-
   if (!Ctx->getFlags().PhiEdgeSplit) {
     // Lower Phi instructions.
     Func->placePhiLoads();
     if (Func->hasError())
       return;
     Func->placePhiStores();
     if (Func->hasError())
       return;
     Func->deletePhis();
     if (Func->hasError())
@@ skipping 75 matching lines @@
 
   // Nop insertion
   if (shouldDoNopInsertion()) {
     Func->doNopInsertion();
   }
 }
 
 void TargetX8632::translateOm1() {
   TimerMarker T(TimerStack::TT_Om1, Func);
 
-  initFakeKilledScratchRegisters();
-
   Func->placePhiLoads();
   if (Func->hasError())
     return;
   Func->placePhiStores();
   if (Func->hasError())
     return;
   Func->deletePhis();
   if (Func->hasError())
     return;
   Func->dump("After Phi lowering");
@@ skipping 1459 matching lines @@
     Context.insert(InstFakeDef::create(Func, ReturnRegHi));
 
   // Add the appropriate offset to esp.  The call instruction takes care
   // of resetting the stack offset during emission.
   if (ParameterAreaSizeBytes) {
     Variable *esp = Func->getTarget()->getPhysicalRegister(RegX8632::Reg_esp);
     _add(esp, Ctx->getConstantInt32(IceType_i32, ParameterAreaSizeBytes));
   }
 
   // Insert a register-kill pseudo instruction.
-  assert(!FakeKilledScratchRegisters.empty());
-  Context.insert(
-      InstFakeKill::create(Func, FakeKilledScratchRegisters, NewCall));
+  Context.insert(InstFakeKill::create(Func, NewCall));
 
   // Generate a FakeUse to keep the call live if necessary.
   if (Instr->hasSideEffects() && ReturnReg) {
     Inst *FakeUse = InstFakeUse::create(Func, ReturnReg);
     Context.insert(FakeUse);
   }
 
   if (!Dest)
     return;
 
@@ skipping 2833 matching lines @@
   } else if (IsConstant || IsExternal)
     Str << "\t.zero\t" << Size << "\n";
   // Size is part of .comm.
 
   if (IsConstant || HasNonzeroInitializer || IsExternal)
     Str << "\t.size\t" << MangledName << ", " << Size << "\n";
   // Size is part of .comm.
 }
 
 } // end of namespace Ice