Use integer division in a certain case.

src/ia32/lithium-codegen-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 1001 matching lines @@
     __ cmp(right_reg, -1);
     DeoptimizeIf(zero, instr->environment());
     __ bind(&left_not_min_int);
   }
 
   // Sign extend to edx.
   __ cdq();
   __ idiv(right_reg);
 
   // Deoptimize if remainder is not 0.
-  __ test(edx, Operand(edx));
-  DeoptimizeIf(not_zero, instr->environment());
+  if (!instr->hydrogen()->CheckFlag(HValue::kWillTruncateToInt32)) {
+    __ test(edx, Operand(edx));
+    DeoptimizeIf(not_zero, instr->environment());
+  }
 }
 
 
 void LCodeGen::DoMathFloorOfDiv(LMathFloorOfDiv* instr) {
   ASSERT(instr->InputAt(1)->IsConstantOperand());
 
   Register dividend = ToRegister(instr->InputAt(0));
   int32_t divisor = ToInteger32(LConstantOperand::cast(instr->InputAt(1)));
   Register result = ToRegister(instr->result());
 
@@ skipping 4316 matching lines @@
                               FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32