MIPS: Consistently use a separate Lithium instruction for flooring division.

src/mips/lithium-mips.cc

Index: src/mips/lithium-mips.cc
diff --git a/src/mips/lithium-mips.cc b/src/mips/lithium-mips.cc
index ccdbcdb5db37017d1bab9f593e62fa1182e8d940..36f1b9583a606671f78abc2532ee942b54a299e9 100644
--- a/src/mips/lithium-mips.cc
+++ b/src/mips/lithium-mips.cc
@@ -1290,7 +1290,7 @@ LInstruction* LChunkBuilder::DoDivByConstI(HDiv* instr) {
 }
 
 
-LInstruction* LChunkBuilder::DoDivI(HBinaryOperation* instr) {
+LInstruction* LChunkBuilder::DoDivI(HDiv* instr) {
   ASSERT(instr->representation().IsSmiOrInteger32());
   ASSERT(instr->left()->representation().Equals(instr->representation()));
   ASSERT(instr->right()->representation().Equals(instr->representation()));
@@ -1351,13 +1351,24 @@ LInstruction* LChunkBuilder::DoFlooringDivByConstI(HMathFloorOfDiv* instr) {
 }
 
 
+LInstruction* LChunkBuilder::DoFlooringDivI(HMathFloorOfDiv* instr) {
+  ASSERT(instr->representation().IsSmiOrInteger32());
+  ASSERT(instr->left()->representation().Equals(instr->representation()));
+  ASSERT(instr->right()->representation().Equals(instr->representation()));
+  LOperand* dividend = UseRegister(instr->left());
+  LOperand* divisor = UseRegister(instr->right());
+  LFlooringDivI* div = new(zone()) LFlooringDivI(dividend, divisor);
+  return AssignEnvironment(DefineAsRegister(div));
+}
+
+
 LInstruction* LChunkBuilder::DoMathFloorOfDiv(HMathFloorOfDiv* instr) {
   if (instr->RightIsPowerOf2()) {
     return DoFlooringDivByPowerOf2I(instr);
   } else if (instr->right()->IsConstant()) {
     return DoFlooringDivByConstI(instr);
   } else {
-    return DoDivI(instr);
+    return DoFlooringDivI(instr);
   }
 }