Adds support for ARM softfp calling convention.

runtime/vm/intermediate_language_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 "vm/globals.h"  // Needed here to get TARGET_ARCH_ARM.
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/dart_entry.h"
@@ skipping 3752 matching lines @@
 
 LocationSummary* MathUnaryInstr::MakeLocationSummary() const {
   if ((kind() == MethodRecognizer::kMathSin) ||
       (kind() == MethodRecognizer::kMathCos)) {
     const intptr_t kNumInputs = 1;
     const intptr_t kNumTemps = 0;
     LocationSummary* summary =
         new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kCall);
     summary->set_in(0, Location::FpuRegisterLocation(Q0));
     summary->set_out(Location::FpuRegisterLocation(Q0));
+#if !defined(ARM_FLOAT_ABI_HARD)
+    summary->AddTemp(Location::RegisterLocation(R0));
+    summary->AddTemp(Location::RegisterLocation(R1));
+    summary->AddTemp(Location::RegisterLocation(R2));
+    summary->AddTemp(Location::RegisterLocation(R3));
+#endif
     return summary;
   }
+  // Sqrt.
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_out(Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void MathUnaryInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   if (kind() == MethodRecognizer::kMathSqrt) {
     DRegister val = EvenDRegisterOf(locs()->in(0).fpu_reg());
     DRegister result = EvenDRegisterOf(locs()->out().fpu_reg());
     __ vsqrtd(result, val);
   } else {
+#if defined(ARM_FLOAT_ABI_HARD)
     __ CallRuntime(TargetFunction(), InputCount());
+#else
+    // If we aren't doing "hardfp", then we have to move the double arguments
+    // to the integer registers, and take the results from the integer
+    // registers.
+    __ vmovrrd(R0, R1, D0);
+    __ vmovrrd(R2, R3, D1);
+    __ CallRuntime(TargetFunction(), InputCount());
+    __ vmovdrr(D0, R0, R1);
+    __ vmovdrr(D1, R2, R3);
+#endif
   }
 }
 
 
 LocationSummary* MathMinMaxInstr::MakeLocationSummary() const {
   if (result_cid() == kDoubleCid) {
     const intptr_t kNumInputs = 2;
     const intptr_t kNumTemps = 1;
     LocationSummary* summary =
         new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
@@ skipping 270 matching lines @@
   LocationSummary* result =
       new LocationSummary(InputCount(), kNumTemps, LocationSummary::kCall);
   result->set_in(0, Location::FpuRegisterLocation(Q0));
   if (InputCount() == 2) {
     result->set_in(1, Location::FpuRegisterLocation(Q1));
   }
   if (recognized_kind() == MethodRecognizer::kMathDoublePow) {
     result->AddTemp(Location::RegisterLocation(R2));
     result->AddTemp(Location::FpuRegisterLocation(Q2));
   }
+#if !defined(ARM_FLOAT_ABI_HARD)
+  result->AddTemp(Location::RegisterLocation(R0));
+  result->AddTemp(Location::RegisterLocation(R1));
+  // Check if R2 is already added.
+  if (recognized_kind() != MethodRecognizer::kMathDoublePow) {
+    result->AddTemp(Location::RegisterLocation(R2));
+  }
+  result->AddTemp(Location::RegisterLocation(R3));
+#endif
   result->set_out(Location::FpuRegisterLocation(Q0));
   return result;
 }
 
 
 void InvokeMathCFunctionInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   // For pow-function return NaN if exponent is NaN.
   Label do_call, skip_call;
   if (recognized_kind() == MethodRecognizer::kMathDoublePow) {
     // Pseudo code:
@@ skipping 22 matching lines @@
 
     __ Bind(&check_base_is_one);
     __ vcmpd(saved_base, result);
     __ vmstat();
     __ vmovd(result, saved_base, VS);  // base is NaN, return NaN.
     __ b(&skip_call, VS);
     __ b(&skip_call, EQ);  // base and result are 1.0.
     __ vmovd(base, saved_base);  // Restore base.
   }
   __ Bind(&do_call);
-  // We currently use 'hardfp' ('gnueabihf') rather than 'softfp'
-  // ('gnueabi') float ABI for leaf runtime calls, i.e. double values
-  // are passed and returned in vfp registers rather than in integer
-  // register pairs.
   if (InputCount() == 2) {
     // Args must be in D0 and D1, so move arg from Q1(== D3:D2) to D1.
     __ vmovd(D1, D2);
   }
+#if defined(ARM_FLOAT_ABI_HARD)
   __ CallRuntime(TargetFunction(), InputCount());
+#else
+  // If the ABI is not "hardfp", then we have to move the double arguments
+  // to the integer registers, and take the results from the integer
+  // registers.
+  __ vmovrrd(R0, R1, D0);
+  __ vmovrrd(R2, R3, D1);
+  __ CallRuntime(TargetFunction(), InputCount());
+  __ vmovdrr(D0, R0, R1);
+  __ vmovdrr(D1, R2, R3);
+#endif
   __ Bind(&skip_call);
 }
 
 
 LocationSummary* PolymorphicInstanceCallInstr::MakeLocationSummary() const {
   return MakeCallSummary();
 }
 
 
 void PolymorphicInstanceCallInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
@@ skipping 508 matching lines @@
   compiler->GenerateCall(token_pos(),
                          &label,
                          PcDescriptors::kOther,
                          locs());
   __ Drop(2);  // Discard type arguments and receiver.
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM