ARM: Implement DoInteger32ToDouble stub.

src/arm/lithium-codegen-arm.cc

 // Copyright 2011 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 2282 matching lines @@
 
 void LCodeGen::DoMathAbs(LUnaryMathOperation* instr) {
   Abort("DoMathAbs unimplemented.");
 }
 
 
 void LCodeGen::DoMathFloor(LUnaryMathOperation* instr) {
   DoubleRegister input = ToDoubleRegister(instr->input());
   Register result = ToRegister(instr->result());
   Register prev_fpscr = ToRegister(instr->temp());
-  SwVfpRegister single_scratch = single_scratch0();
+  SwVfpRegister single_scratch = double_scratch0().low();
   Register scratch = scratch0();
 
   // Set custom FPCSR:
   //  - Set rounding mode to "Round towards Minus Infinity".
   //  - Clear vfp cumulative exception flags.
   //  - Make sure Flush-to-zero mode control bit is unset.
   __ vmrs(prev_fpscr);
   __ bic(scratch, prev_fpscr,
       Operand(kVFPExceptionMask | kVFPRoundingModeMask | kVFPFlushToZeroMask));
   __ orr(scratch, scratch, Operand(kVFPRoundToMinusInfinityBits));
@@ skipping 187 matching lines @@
   ASSERT(ToRegister(instr->object()).is(r2));
   ASSERT(ToRegister(instr->key()).is(r1));
   ASSERT(ToRegister(instr->value()).is(r0));
 
   Handle<Code> ic(Builtins::builtin(Builtins::KeyedStoreIC_Initialize));
   CallCode(ic, RelocInfo::CODE_TARGET, instr);
 }
 
 
 void LCodeGen::DoInteger32ToDouble(LInteger32ToDouble* instr) {
-  Abort("DoInteger32ToDouble unimplemented.");
+  LOperand* input = instr->input();
+  ASSERT(input->IsRegister() || input->IsStackSlot());
+  LOperand* output = instr->result();
+  ASSERT(output->IsDoubleRegister());
+  SwVfpRegister single_scratch = double_scratch0().low();
+  if (input->IsStackSlot()) {
+    Register scratch = scratch0();
+    __ ldr(scratch, ToMemOperand(input));
+    __ vmov(single_scratch, scratch);
+  } else {
+    __ vmov(single_scratch, ToRegister(input));
+  }
+  __ vcvt_f64_s32(ToDoubleRegister(output), single_scratch);
 }
 
 
 void LCodeGen::DoNumberTagI(LNumberTagI* instr) {
   class DeferredNumberTagI: public LDeferredCode {
    public:
     DeferredNumberTagI(LCodeGen* codegen, LNumberTagI* instr)
         : LDeferredCode(codegen), instr_(instr) { }
     virtual void Generate() { codegen()->DoDeferredNumberTagI(instr_); }
    private:
@@ skipping 657 matching lines @@
 
 
 void LCodeGen::DoOsrEntry(LOsrEntry* instr) {
   Abort("DoOsrEntry unimplemented.");
 }
 
 
 #undef __
 
 } }  // namespace v8::internal