For arm, chooses hard vs. soft fp ABI based on compiler.

runtime/vm/simulator_arm.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include <math.h>  // for isnan.
 #include <setjmp.h>
 #include <stdlib.h>
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_ARM)
@@ skipping 1440 matching lines @@
           SimulatorLeafRuntimeCall target =
               reinterpret_cast<SimulatorLeafRuntimeCall>(external);
           r0 = target(r0, r1, r2, r3);
           set_register(R0, r0);  // Set returned result from function.
           set_register(R1, icount_);  // Zap unused result register.
         } else if (redirection->call_kind() == kLeafFloatRuntimeCall) {
           ASSERT((0 <= redirection->argument_count()) &&
                  (redirection->argument_count() <= 2));
           SimulatorLeafFloatRuntimeCall target =
               reinterpret_cast<SimulatorLeafFloatRuntimeCall>(external);
-#if defined(ARM_FLOAT_ABI_HARD)
-          // If we're doing "hardfp", the double arguments are already in the
-          // floating point registers.
-          double d0 = get_dregister(D0);
-          double d1 = get_dregister(D1);
-          d0 = target(d0, d1);
-          set_dregister(D0, d0);
-#else
-          // If we're not doing "hardfp", we must be doing "soft" or "softfp",
-          // So take the double arguments from the integer registers.
-          uint32_t r0 = get_register(R0);
-          int32_t r1 = get_register(R1);
-          uint32_t r2 = get_register(R2);
-          int32_t r3 = get_register(R3);
-          int64_t a0 = Utils::LowHighTo64Bits(r0, r1);
-          int64_t a1 = Utils::LowHighTo64Bits(r2, r3);
-          double d0 = bit_cast<double, int64_t>(a0);
-          double d1 = bit_cast<double, int64_t>(a1);
-          d0 = target(d0, d1);
-          a0 = bit_cast<int64_t, double>(d0);
-          r0 = Utils::Low32Bits(a0);
-          r1 = Utils::High32Bits(a0);
-          set_register(R0, r0);
-          set_register(R1, r1);
-#endif
+          if (TargetCPUFeatures::hardfp_supported()) {
+            // If we're doing "hardfp", the double arguments are already in the
+            // floating point registers.
+            double d0 = get_dregister(D0);
+            double d1 = get_dregister(D1);
+            d0 = target(d0, d1);
+            set_dregister(D0, d0);
+          } else {
+            // If we're not doing "hardfp", we must be doing "soft" or "softfp",
+            // So take the double arguments from the integer registers.
+            uint32_t r0 = get_register(R0);
+            int32_t r1 = get_register(R1);
+            uint32_t r2 = get_register(R2);
+            int32_t r3 = get_register(R3);
+            int64_t a0 = Utils::LowHighTo64Bits(r0, r1);
+            int64_t a1 = Utils::LowHighTo64Bits(r2, r3);
+            double d0 = bit_cast<double, int64_t>(a0);
+            double d1 = bit_cast<double, int64_t>(a1);
+            d0 = target(d0, d1);
+            a0 = bit_cast<int64_t, double>(d0);
+            r0 = Utils::Low32Bits(a0);
+            r1 = Utils::High32Bits(a0);
+            set_register(R0, r0);
+            set_register(R1, r1);
+          }
         } else if (redirection->call_kind() == kBootstrapNativeCall) {
           NativeArguments* arguments;
           arguments = reinterpret_cast<NativeArguments*>(get_register(R0));
           SimulatorBootstrapNativeCall target =
               reinterpret_cast<SimulatorBootstrapNativeCall>(external);
           target(arguments);
           set_register(R0, icount_);  // Zap result register from void function.
         } else {
           ASSERT(redirection->call_kind() == kNativeCall);
           NativeArguments* arguments;
@@ skipping 2223 matching lines @@
   set_register(kExceptionObjectReg, bit_cast<int32_t>(raw_exception));
   set_register(kStackTraceObjectReg, bit_cast<int32_t>(raw_stacktrace));
   buf->Longjmp();
 }
 
 }  // namespace dart
 
 #endif  // !defined(HOST_ARCH_ARM)
 
 #endif  // defined TARGET_ARCH_ARM