ARM: Support hardfloat in SCons build and make it a build time setting

src/arm/macro-assembler-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 854 matching lines @@
 
   // Tear down the exit frame, pop the arguments, and return.
   mov(sp, Operand(fp));
   ldm(ia_w, sp, fp.bit() | lr.bit());
   if (argument_count.is_valid()) {
     add(sp, sp, Operand(argument_count, LSL, kPointerSizeLog2));
   }
 }
 
 void MacroAssembler::GetCFunctionDoubleResult(const DoubleRegister dst) {
-  if (FLAG_hardfloat) {
+  if (use_eabi_hardfloat()) {
     Move(dst, d0);
   } else {
     vmov(dst, r0, r1);
   }
 }
 
 
 void MacroAssembler::InvokePrologue(const ParameterCount& expected,
                                     const ParameterCount& actual,
                                     Handle<Code> code_constant,
@@ skipping 1942 matching lines @@
   cmp(scratch, Operand(kFlatAsciiStringTag));
   b(ne, failure);
 }
 
 static const int kRegisterPassedArguments = 4;
 
 
 int MacroAssembler::CalculateStackPassedWords(int num_reg_arguments,
                                               int num_double_arguments) {
   int stack_passed_words = 0;
-  if (FLAG_hardfloat) {
+  if (use_eabi_hardfloat()) {
     // In the hard floating point calling convention, we can use
     // all double registers to pass doubles.
     if (num_double_arguments > DoubleRegister::kNumRegisters) {
       stack_passed_words +=
           2 * (num_double_arguments - DoubleRegister::kNumRegisters);
     }
   } else {
     // In the soft floating point calling convention, every double
     // argument is passed using two registers.
     num_reg_arguments += 2 * num_double_arguments;
@@ skipping 26 matching lines @@
 }
 
 
 void MacroAssembler::PrepareCallCFunction(int num_reg_arguments,
                                           Register scratch) {
   PrepareCallCFunction(num_reg_arguments, 0, scratch);
 }
 
 
 void MacroAssembler::SetCallCDoubleArguments(DoubleRegister dreg) {
-  if (FLAG_hardfloat) {
+  if (use_eabi_hardfloat()) {
     Move(d0, dreg);
   } else {
     vmov(r0, r1, dreg);
   }
 }
 
 
 void MacroAssembler::SetCallCDoubleArguments(DoubleRegister dreg1,
                                              DoubleRegister dreg2) {
-  if (FLAG_hardfloat) {
+  if (use_eabi_hardfloat()) {
     if (dreg2.is(d0)) {
       ASSERT(!dreg1.is(d1));
       Move(d1, dreg2);
       Move(d0, dreg1);
     } else {
       Move(d0, dreg1);
       Move(d1, dreg2);
     }
   } else {
     vmov(r0, r1, dreg1);
     vmov(r2, r3, dreg2);
   }
 }
 
 
 void MacroAssembler::SetCallCDoubleArguments(DoubleRegister dreg,
                                              Register reg) {
-  if (FLAG_hardfloat) {
+  if (use_eabi_hardfloat()) {
     Move(d0, dreg);
     Move(r0, reg);
   } else {
     Move(r2, reg);
     vmov(r0, r1, dreg);
   }
 }
 
 
 void MacroAssembler::CallCFunction(ExternalReference function,
@@ skipping 130 matching lines @@
 void CodePatcher::EmitCondition(Condition cond) {
   Instr instr = Assembler::instr_at(masm_.pc_);
   instr = (instr & ~kCondMask) | cond;
   masm_.emit(instr);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM