Use integer division in a certain case.

src/x64/lithium-codegen-x64.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 994 matching lines @@
     __ cmpl(right_reg, Immediate(-1));
     DeoptimizeIf(zero, instr->environment());
     __ bind(&left_not_min_int);
   }
 
   // Sign extend to rdx.
   __ cdq();
   __ idivl(right_reg);
 
   // Deoptimize if remainder is not 0.
-  __ testl(rdx, rdx);
-  DeoptimizeIf(not_zero, instr->environment());
+  if (!instr->hydrogen()->CheckFlag(HValue::kWillTruncateToInt32)) {
+    __ testl(rdx, rdx);
+    DeoptimizeIf(not_zero, instr->environment());
+  }
 }
 
 
 void LCodeGen::DoMulI(LMulI* instr) {
   Register left = ToRegister(instr->InputAt(0));
   LOperand* right = instr->InputAt(1);
 
   if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
     __ movl(kScratchRegister, left);
   }
@@ skipping 4044 matching lines @@
                                FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64