MIPS: Support for DoubleToIStub (truncating).

src/mips/lithium-codegen-mips.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 4835 matching lines @@
   __ cvt_d_w(result_reg, result_reg);
   __ bind(&done);
 }
 
 
 void LCodeGen::DoDeferredTaggedToI(LTaggedToI* instr) {
   Register input_reg = ToRegister(instr->value());
   Register scratch1 = scratch0();
   Register scratch2 = ToRegister(instr->temp());
   DoubleRegister double_scratch = double_scratch0();
-  DoubleRegister double_scratch2 = ToDoubleRegister(instr->temp3());
+  DoubleRegister double_scratch2 = ToDoubleRegister(instr->temp2());
 
   ASSERT(!scratch1.is(input_reg) && !scratch1.is(scratch2));
   ASSERT(!scratch2.is(input_reg) && !scratch2.is(scratch1));
 
   Label done;
 
   // The input is a tagged HeapObject.
   // Heap number map check.
   __ lw(scratch1, FieldMemOperand(input_reg, HeapObject::kMapOffset));
   __ LoadRoot(at, Heap::kHeapNumberMapRootIndex);
   // This 'at' value and scratch1 map value are used for tests in both clauses
   // of the if.
 
   if (instr->truncating()) {
-    Register scratch3 = ToRegister(instr->temp2());
-    FPURegister single_scratch = double_scratch.low();
-    ASSERT(!scratch3.is(input_reg) &&
-           !scratch3.is(scratch1) &&
-           !scratch3.is(scratch2));
     // Performs a truncating conversion of a floating point number as used by
     // the JS bitwise operations.
     Label heap_number;
     __ Branch(&heap_number, eq, scratch1, Operand(at));  // HeapNumber map?
     // Check for undefined. Undefined is converted to zero for truncating
     // conversions.
     __ LoadRoot(at, Heap::kUndefinedValueRootIndex);
     DeoptimizeIf(ne, instr->environment(), input_reg, Operand(at));
     ASSERT(ToRegister(instr->result()).is(input_reg));
     __ mov(input_reg, zero_reg);
     __ Branch(&done);
 
     __ bind(&heap_number);
-    __ ldc1(double_scratch2,
-            FieldMemOperand(input_reg, HeapNumber::kValueOffset));
-    __ EmitECMATruncate(input_reg,
-                        double_scratch2,
-                        single_scratch,
-                        scratch1,
-                        scratch2,
-                        scratch3);
+    __ mov(scratch2, input_reg);
+    __ TruncateHeapNumberToI(input_reg, scratch2);
   } else {
     // Deoptimize if we don't have a heap number.
     DeoptimizeIf(ne, instr->environment(), scratch1, Operand(at));
 
     // Load the double value.
     __ ldc1(double_scratch,
             FieldMemOperand(input_reg, HeapNumber::kValueOffset));
 
     Register except_flag = scratch2;
     __ EmitFPUTruncate(kRoundToZero,
@@ skipping 66 matching lines @@
                    instr->hydrogen()->can_convert_undefined_to_nan(),
                    instr->hydrogen()->deoptimize_on_minus_zero(),
                    instr->environment(),
                    mode);
 }
 
 
 void LCodeGen::DoDoubleToI(LDoubleToI* instr) {
   Register result_reg = ToRegister(instr->result());
   Register scratch1 = scratch0();
-  Register scratch2 = ToRegister(instr->temp());
   DoubleRegister double_input = ToDoubleRegister(instr->value());
 
   if (instr->truncating()) {
-    Register scratch3 = ToRegister(instr->temp2());
-    FPURegister single_scratch = double_scratch0().low();
-    __ EmitECMATruncate(result_reg,
-                        double_input,
-                        single_scratch,
-                        scratch1,
-                        scratch2,
-                        scratch3);
+    __ TruncateDoubleToI(result_reg, double_input);
   } else {
-    Register except_flag = scratch2;
+    Register except_flag = LCodeGen::scratch1();
 
     __ EmitFPUTruncate(kRoundToMinusInf,
                        result_reg,
                        double_input,
                        scratch1,
                        double_scratch0(),
                        except_flag,
                        kCheckForInexactConversion);
 
     // Deopt if the operation did not succeed (except_flag != 0).
     DeoptimizeIf(ne, instr->environment(), except_flag, Operand(zero_reg));
 
     if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
       Label done;
       __ Branch(&done, ne, result_reg, Operand(zero_reg));
       __ mfc1(scratch1, double_input.high());
       __ And(scratch1, scratch1, Operand(HeapNumber::kSignMask));
       DeoptimizeIf(ne, instr->environment(), scratch1, Operand(zero_reg));
       __ bind(&done);
     }
   }
 }
 
 
 void LCodeGen::DoDoubleToSmi(LDoubleToSmi* instr) {
   Register result_reg = ToRegister(instr->result());
-  Register scratch1 = scratch0();
-  Register scratch2 = ToRegister(instr->temp());
+  Register scratch1 = LCodeGen::scratch0();
   DoubleRegister double_input = ToDoubleRegister(instr->value());
 
   if (instr->truncating()) {
-    Register scratch3 = ToRegister(instr->temp2());
-    FPURegister single_scratch = double_scratch0().low();
-    __ EmitECMATruncate(result_reg,
-                        double_input,
-                        single_scratch,
-                        scratch1,
-                        scratch2,
-                        scratch3);
+    __ TruncateDoubleToI(result_reg, double_input);
   } else {
-    Register except_flag = scratch2;
+    Register except_flag = LCodeGen::scratch1();
 
     __ EmitFPUTruncate(kRoundToMinusInf,
                        result_reg,
                        double_input,
                        scratch1,
                        double_scratch0(),
                        except_flag,
                        kCheckForInexactConversion);
 
     // Deopt if the operation did not succeed (except_flag != 0).
@@ skipping 754 matching lines @@
   __ Subu(scratch, result, scratch);
   __ lw(result, FieldMemOperand(scratch,
                                 FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal