MIPS: ARM: Fast path for integer inputs to EmitVFPTruncate

src/mips/lithium-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1031 matching lines @@
     return MarkAsCall(DefineFixedDouble(result, f4), instr);
   } else if (op == kMathPowHalf) {
     // Input cannot be the same as the result.
     // See lithium-codegen-mips.cc::DoMathPowHalf.
     LOperand* input = UseFixedDouble(instr->value(), f8);
     LOperand* temp = FixedTemp(f6);
     LUnaryMathOperation* result = new(zone()) LUnaryMathOperation(input, temp);
     return DefineFixedDouble(result, f4);
   } else {
     LOperand* input = UseRegisterAtStart(instr->value());
-    LOperand* temp = (op == kMathFloor) ? TempRegister() : NULL;
+
+    LOperand* temp = (op == kMathRound) ? FixedTemp(f6) :
+        (op == kMathFloor) ? TempRegister() : NULL;
     LUnaryMathOperation* result = new(zone()) LUnaryMathOperation(input, temp);
     switch (op) {
       case kMathAbs:
         return AssignEnvironment(AssignPointerMap(DefineAsRegister(result)));
       case kMathFloor:
         return AssignEnvironment(AssignPointerMap(DefineAsRegister(result)));
       case kMathSqrt:
         return DefineAsRegister(result);
       case kMathRound:
         return AssignEnvironment(DefineAsRegister(result));
@@ skipping 496 matching lines @@
     } else {
       ASSERT(to.IsInteger32());
       LOperand* value = UseRegisterAtStart(instr->value());
       LInstruction* res = NULL;
       if (instr->value()->type().IsSmi()) {
         res = DefineAsRegister(new(zone()) LSmiUntag(value, false));
       } else {
         LOperand* temp1 = TempRegister();
         LOperand* temp2 = instr->CanTruncateToInt32() ? TempRegister()
                                                       : NULL;
-        LOperand* temp3 = instr->CanTruncateToInt32() ? FixedTemp(f22)
-                                                      : NULL;
+        LOperand* temp3 = FixedTemp(f22);
         res = DefineSameAsFirst(new(zone()) LTaggedToI(value,
                                                        temp1,
                                                        temp2,
                                                        temp3));
         res = AssignEnvironment(res);
       }
       return res;
     }
   } else if (from.IsDouble()) {
     if (to.IsTagged()) {
@@ skipping 646 matching lines @@
 
 
 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
   LOperand* object = UseRegister(instr->object());
   LOperand* index = UseRegister(instr->index());
   return DefineAsRegister(new(zone()) LLoadFieldByIndex(object, index));
 }
 
 
 } }  // namespace v8::internal