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

src/arm/code-stubs-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 813 matching lines @@
   // r3: Right value (sign, exponent, top of mantissa).
 
   // Assert that heap_number_result is callee-saved.
   // We currently always use r5 to pass it.
   ASSERT(heap_number_result.is(r5));
 
   // Push the current return address before the C call. Return will be
   // through pop(pc) below.
   __ push(lr);
   __ PrepareCallCFunction(0, 2, scratch);
-  if (FLAG_hardfloat) {
-    ASSERT(CpuFeatures::IsSupported(VFP3));
+  if (masm->use_eabi_hardfloat()) {
     CpuFeatures::Scope scope(VFP3);
     __ vmov(d0, r0, r1);
     __ vmov(d1, r2, r3);
   }
   // Call C routine that may not cause GC or other trouble.
   __ CallCFunction(ExternalReference::double_fp_operation(op, masm->isolate()),
                    0, 2);
   // Store answer in the overwritable heap number. Double returned in
   // registers r0 and r1 or in d0.
-  if (FLAG_hardfloat) {
+  if (masm->use_eabi_hardfloat()) {
     CpuFeatures::Scope scope(VFP3);
     __ vstr(d0,
             FieldMemOperand(heap_number_result, HeapNumber::kValueOffset));
   } else {
     __ Strd(r0, r1, FieldMemOperand(heap_number_result,
                                     HeapNumber::kValueOffset));
   }
   // Place heap_number_result in r0 and return to the pushed return address.
   __ mov(r0, Operand(heap_number_result));
   __ pop(pc);
@@ skipping 329 matching lines @@
     __ Ret(ne);
     // Now they are equal if and only if the lhs exponent is zero in its
     // low 31 bits.
     __ mov(r0, Operand(rhs_exponent, LSL, kSmiTagSize));
     __ Ret();
   } else {
     // Call a native function to do a comparison between two non-NaNs.
     // Call C routine that may not cause GC or other trouble.
     __ push(lr);
     __ PrepareCallCFunction(0, 2, r5);
-    if (FLAG_hardfloat) {
-      ASSERT(CpuFeatures::IsSupported(VFP3));
+    if (masm->use_eabi_hardfloat()) {
       CpuFeatures::Scope scope(VFP3);
       __ vmov(d0, r0, r1);
       __ vmov(d1, r2, r3);
     }
     __ CallCFunction(ExternalReference::compare_doubles(masm->isolate()),
                      0, 2);
     __ pop(pc);  // Return.
   }
 }
 
@@ skipping 1640 matching lines @@
   }
 }
 
 
 void TranscendentalCacheStub::GenerateCallCFunction(MacroAssembler* masm,
                                                     Register scratch) {
   Isolate* isolate = masm->isolate();
 
   __ push(lr);
   __ PrepareCallCFunction(0, 1, scratch);
-  if (FLAG_hardfloat) {
+  if (masm->use_eabi_hardfloat()) {
     __ vmov(d0, d2);
   } else {
     __ vmov(r0, r1, d2);
   }
   switch (type_) {
     case TranscendentalCache::SIN:
       __ CallCFunction(ExternalReference::math_sin_double_function(isolate),
           0, 1);
       break;
     case TranscendentalCache::COS:
@@ skipping 2936 matching lines @@
   __ str(pc, MemOperand(sp, 0));
   __ Jump(target);  // Call the C++ function.
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM