MIPS: Tweaked FlooringDiv back to TruncatingDiv again.

src/mips/lithium-codegen-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.7
 // 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 1093 matching lines @@
   Register dividend = ToRegister(instr->dividend());
   int32_t divisor = instr->divisor();
   Register result = ToRegister(instr->result());
   ASSERT(!dividend.is(result));
 
   if (divisor == 0) {
     DeoptimizeIf(al, instr->environment());
     return;
   }
 
-  __ FlooringDiv(result, dividend, Abs(divisor));
-  __ srl(at, dividend, 31);
-  __ Addu(result, result, at);
+  __ TruncatingDiv(result, dividend, Abs(divisor));
   __ Mul(result, result, Operand(Abs(divisor)));
   __ Subu(result, dividend, Operand(result));
 
   // Check for negative zero.
   HMod* hmod = instr->hydrogen();
   if (hmod->CheckFlag(HValue::kBailoutOnMinusZero)) {
     Label remainder_not_zero;
     __ Branch(&remainder_not_zero, ne, result, Operand(zero_reg));
     DeoptimizeIf(lt, instr->environment(), dividend, Operand(zero_reg));
     __ bind(&remainder_not_zero);
@@ skipping 96 matching lines @@
     DeoptimizeIf(al, instr->environment());
     return;
   }
 
   // Check for (0 / -x) that will produce negative zero.
   HDiv* hdiv = instr->hydrogen();
   if (hdiv->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0) {
     DeoptimizeIf(eq, instr->environment(), dividend, Operand(zero_reg));
   }
 
-  __ FlooringDiv(result, dividend, Abs(divisor));
-  __ srl(at, dividend, 31);
-  __ Addu(result, result, Operand(at));
+  __ TruncatingDiv(result, dividend, Abs(divisor));
   if (divisor < 0) __ Subu(result, zero_reg, result);
 
   if (!hdiv->CheckFlag(HInstruction::kAllUsesTruncatingToInt32)) {
     __ Mul(scratch0(), result, Operand(divisor));
     __ Subu(scratch0(), scratch0(), dividend);
     DeoptimizeIf(ne, instr->environment(), scratch0(), Operand(zero_reg));
   }
 }
 
 
@@ skipping 118 matching lines @@
     DeoptimizeIf(al, instr->environment());
     return;
   }
 
   // Check for (0 / -x) that will produce negative zero.
   HMathFloorOfDiv* hdiv = instr->hydrogen();
   if (hdiv->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0) {
     DeoptimizeIf(eq, instr->environment(), dividend, Operand(zero_reg));
   }
 
-  __ FlooringDiv(result, dividend, divisor);
+  // TODO(svenpanne) Add correction terms.
+  __ TruncatingDiv(result, dividend, divisor);
 }
 
 
 void LCodeGen::DoMulI(LMulI* instr) {
   Register scratch = scratch0();
   Register result = ToRegister(instr->result());
   // Note that result may alias left.
   Register left = ToRegister(instr->left());
   LOperand* right_op = instr->right();
 
@@ skipping 4408 matching lines @@
   __ Subu(scratch, result, scratch);
   __ lw(result, FieldMemOperand(scratch,
                                 FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal