Consistently use a separate Lithium instruction for flooring division.

src/arm64/lithium-codegen-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
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@@ skipping 2689 matching lines @@
     Register temp = ToRegister32(instr->temp());
     ASSERT(!AreAliased(dividend, result, temp));
     __ Sxtw(dividend.X(), dividend);
     __ Mov(temp, divisor);
     __ Smsubl(temp.X(), result, temp, dividend.X());
     DeoptimizeIfNotZero(temp, instr->environment());
   }
 }
 
 
+// TODO(svenpanne) Refactor this to avoid code duplication with DoFlooringDivI.
 void LCodeGen::DoDivI(LDivI* instr) {
   HBinaryOperation* hdiv = instr->hydrogen();
-  Register dividend = ToRegister32(instr->left());
-  Register divisor = ToRegister32(instr->right());
+  Register dividend = ToRegister32(instr->dividend());
+  Register divisor = ToRegister32(instr->divisor());
   Register result = ToRegister32(instr->result());
 
   // Issue the division first, and then check for any deopt cases whilst the
   // result is computed.
   __ Sdiv(result, dividend, divisor);
 
   if (hdiv->CheckFlag(HValue::kAllUsesTruncatingToInt32)) {
     ASSERT_EQ(NULL, instr->temp());
     return;
   }
@@ skipping 1205 matching lines @@
   __ B(&done);
   __ bind(&needs_adjustment);
   __ Add(temp, dividend, Operand(divisor > 0 ? 1 : -1));
   __ TruncatingDiv(result, temp, Abs(divisor));
   if (divisor < 0) __ Neg(result, result);
   __ Sub(result, result, Operand(1));
   __ bind(&done);
 }
 
 
+// TODO(svenpanne) Refactor this to avoid code duplication with DoDivI.
 void LCodeGen::DoFlooringDivI(LFlooringDivI* instr) {
   Register dividend = ToRegister32(instr->dividend());
   Register divisor = ToRegister32(instr->divisor());
   Register remainder = ToRegister32(instr->temp());
   Register result = ToRegister32(instr->result());
 
   // This can't cause an exception on ARM, so we can speculatively
   // execute it already now.
   __ Sdiv(result, dividend, divisor);
 
@@ skipping 1998 matching lines @@
   __ Ldr(result, FieldMemOperand(object, JSObject::kPropertiesOffset));
   // Index is equal to negated out of object property index plus 1.
   __ Sub(result, result, Operand::UntagSmiAndScale(index, kPointerSizeLog2));
   __ Ldr(result, FieldMemOperand(result,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ Bind(deferred->exit());
   __ Bind(&done);
 }
 
 } }  // namespace v8::internal