Revert "mod does not rely on a fixed register anymore, the arguments are passed via the stack."

src/ia32/lithium-ia32.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 791 matching lines @@
       DefineSameAsFirst(new(zone()) LShiftI(op, left, right, does_deopt));
   return does_deopt ? AssignEnvironment(result) : result;
 }
 
 
 LInstruction* LChunkBuilder::DoArithmeticD(Token::Value op,
                                            HArithmeticBinaryOperation* instr) {
   ASSERT(instr->representation().IsDouble());
   ASSERT(instr->left()->representation().IsDouble());
   ASSERT(instr->right()->representation().IsDouble());
+  ASSERT(op != Token::MOD);
   LOperand* left = UseRegisterAtStart(instr->BetterLeftOperand());
   LOperand* right = UseRegisterAtStart(instr->BetterRightOperand());
   LArithmeticD* result = new(zone()) LArithmeticD(op, left, right);
-  // We call a C function for double modulo. It can't trigger a GC.
-  if (op == Token::MOD) return MarkAsCall(DefineAsRegister(result), instr);
   return DefineSameAsFirst(result);
 }
 
 
 LInstruction* LChunkBuilder::DoArithmeticT(Token::Value op,
                                            HArithmeticBinaryOperation* instr) {
   ASSERT(op == Token::ADD ||
          op == Token::DIV ||
          op == Token::MOD ||
          op == Token::MUL ||
@@ skipping 730 matching lines @@
               (left->CanBeNegative() &&
                instr->CanBeZero() &&
                instr->CheckFlag(HValue::kBailoutOnMinusZero)))
           ? AssignEnvironment(result)
           : result;
     }
   } else if (instr->representation().IsSmiOrTagged()) {
     return DoArithmeticT(Token::MOD, instr);
   } else {
     ASSERT(instr->representation().IsDouble());
-    return DoArithmeticD(Token::MOD, instr);
+    // We call a C function for double modulo. It can't trigger a GC. We need
+    // to use fixed result register for the call.
+    // TODO(fschneider): Allow any register as input registers.
+    LArithmeticD* mod = new(zone()) LArithmeticD(Token::MOD,
+                                                 UseFixedDouble(left, xmm2),
+                                                 UseFixedDouble(right, xmm1));
+    return MarkAsCall(DefineFixedDouble(mod, xmm1), instr);
   }
 }
 
 
 LInstruction* LChunkBuilder::DoMul(HMul* instr) {
   if (instr->representation().IsSmiOrInteger32()) {
     ASSERT(instr->left()->representation().Equals(instr->representation()));
     ASSERT(instr->right()->representation().Equals(instr->representation()));
     LOperand* left = UseRegisterAtStart(instr->BetterLeftOperand());
     LOperand* right = UseOrConstant(instr->BetterRightOperand());
@@ skipping 1166 matching lines @@
 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
   LOperand* object = UseRegister(instr->object());
   LOperand* index = UseTempRegister(instr->index());
   return DefineSameAsFirst(new(zone()) LLoadFieldByIndex(object, index));
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32