ARM: Make use of d16-d31 when available.

src/arm/code-stubs-arm.cc

Index: src/arm/code-stubs-arm.cc
diff --git a/src/arm/code-stubs-arm.cc b/src/arm/code-stubs-arm.cc
index 9484f85f97e38ff87de543ec4c25dee3b9d6984e..fad4b6a5f070cfd68ff360150b6883ce1d767e2c 100644
--- a/src/arm/code-stubs-arm.cc
+++ b/src/arm/code-stubs-arm.cc
@@ -2036,8 +2036,8 @@ void StoreBufferOverflowStub::Generate(MacroAssembler* masm) {
   __ stm(db_w, sp, kCallerSaved | lr.bit());
   if (save_doubles_ == kSaveFPRegs) {
     CpuFeatures::Scope scope(VFP2);
-    __ sub(sp, sp, Operand(kDoubleSize * DwVfpRegister::kNumRegisters));
-    for (int i = 0; i < DwVfpRegister::kNumRegisters; i++) {
+    __ sub(sp, sp, Operand(kDoubleSize * DwVfpRegister::NumAvailableRegisters()));
+    for (int i = 0; i < DwVfpRegister::NumAvailableRegisters(); i++) {
       DwVfpRegister reg = DwVfpRegister::from_code(i);
       __ vstr(reg, MemOperand(sp, i * kDoubleSize));
     }
@@ -2054,11 +2054,12 @@ void StoreBufferOverflowStub::Generate(MacroAssembler* masm) {
       argument_count);
   if (save_doubles_ == kSaveFPRegs) {
     CpuFeatures::Scope scope(VFP2);
-    for (int i = 0; i < DwVfpRegister::kNumRegisters; i++) {
+    for (int i = 0; i < DwVfpRegister::NumAvailableRegisters(); i++) {
       DwVfpRegister reg = DwVfpRegister::from_code(i);
       __ vldr(reg, MemOperand(sp, i * kDoubleSize));
     }
-    __ add(sp, sp, Operand(kDoubleSize * DwVfpRegister::kNumRegisters));
+    __ add(sp, sp, Operand(kDoubleSize *
+                           DwVfpRegister::NumAvailableRegisters()));
   }
   __ ldm(ia_w, sp, kCallerSaved | pc.bit());  // Also pop pc to get Ret(0).
 }
@@ -3644,7 +3645,7 @@ void MathPowStub::Generate(MacroAssembler* masm) {
       __ b(eq, &done);
 
       // Add +0 to convert -0 to +0.
-      __ vadd(double_scratch, double_base, kDoubleRegZero);
+      __ vadd(double_scratch, double_base, DwVfpRegister::ZeroReg());
       __ vsqrt(double_result, double_scratch);
       __ jmp(&done);
 
@@ -3657,11 +3658,11 @@ void MathPowStub::Generate(MacroAssembler* masm) {
       // Math.pow(-Infinity, -0.5) == 0 (ECMA spec, 15.8.2.13).
       __ vmov(double_scratch, -V8_INFINITY, scratch);
       __ VFPCompareAndSetFlags(double_base, double_scratch);
-      __ vmov(double_result, kDoubleRegZero, eq);
+      __ vmov(double_result, DwVfpRegister::ZeroReg(), eq);
       __ b(eq, &done);
 
       // Add +0 to convert -0 to +0.
-      __ vadd(double_scratch, double_base, kDoubleRegZero);
+      __ vadd(double_scratch, double_base, DwVfpRegister::ZeroReg());
       __ vmov(double_result, 1.0, scratch);
       __ vsqrt(double_scratch, double_scratch);
       __ vdiv(double_result, double_result, double_scratch);
@@ -4022,9 +4023,10 @@ void JSEntryStub::GenerateBody(MacroAssembler* masm, bool is_construct) {
   if (CpuFeatures::IsSupported(VFP2)) {
     CpuFeatures::Scope scope(VFP2);
     // Save callee-saved vfp registers.
-    __ vstm(db_w, sp, kFirstCalleeSavedDoubleReg, kLastCalleeSavedDoubleReg);
+    __ Vstm(db_w, sp, DwVfpRegister::FirstCalleeSavedReg(),
+            DwVfpRegister::LastCalleeSavedReg());
     // Set up the reserved register for 0.0.
-    __ vmov(kDoubleRegZero, 0.0);
+    __ vmov(DwVfpRegister::ZeroReg(), 0.0);
   }
 
   // Get address of argv, see stm above.
@@ -4036,7 +4038,7 @@ void JSEntryStub::GenerateBody(MacroAssembler* masm, bool is_construct) {
   // Set up argv in r4.
   int offset_to_argv = (kNumCalleeSaved + 1) * kPointerSize;
   if (CpuFeatures::IsSupported(VFP2)) {
-    offset_to_argv += kNumDoubleCalleeSaved * kDoubleSize;
+    offset_to_argv += DwVfpRegister::NumCalleeSaved() * kDoubleSize;
   }
   __ ldr(r4, MemOperand(sp, offset_to_argv));
 
@@ -4176,7 +4178,8 @@ void JSEntryStub::GenerateBody(MacroAssembler* masm, bool is_construct) {
   if (CpuFeatures::IsSupported(VFP2)) {
     CpuFeatures::Scope scope(VFP2);
     // Restore callee-saved vfp registers.
-    __ vldm(ia_w, sp, kFirstCalleeSavedDoubleReg, kLastCalleeSavedDoubleReg);
+    __ Vldm(ia_w, sp, DwVfpRegister::FirstCalleeSavedReg(),
+            DwVfpRegister::LastCalleeSavedReg());
   }
 
   __ ldm(ia_w, sp, kCalleeSaved | pc.bit());