Shorter TryAllocate instruction sequence on ARM/ARM64/MIPS.

runtime/vm/intrinsifier_arm64.cc

 // Copyright (c) 2014, 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_ARM64.
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/intrinsifier.h"
 
 #include "vm/assembler.h"
@@ skipping 409 matching lines @@
                                    R1,  // Array.
                                    R0);  // Index.
 
   __ fldrd(V0, element_address);
 
   const Class& double_class = Class::Handle(
       Isolate::Current()->object_store()->double_class());
   __ TryAllocate(double_class,
                  &fall_through,
                  R0,  // Result register.
+                 R1,  // Temp register.
                  kNoPP);
   __ StoreDFieldToOffset(V0, R0, Double::value_offset(), kNoPP);
   __ ret();
   __ Bind(&fall_through);
 }
 
 
 void Intrinsifier::Float64Array_setIndexed(Assembler* assembler) {
   Label fall_through;
   __ ldr(R0, Address(SP, + 1 * kWordSize));  // Index.
@@ skipping 627 matching lines @@
   __ LoadDFieldFromOffset(V0, R0, Double::value_offset(), kNoPP);
   switch (kind) {
     case Token::kADD: __ faddd(V0, V0, V1); break;
     case Token::kSUB: __ fsubd(V0, V0, V1); break;
     case Token::kMUL: __ fmuld(V0, V0, V1); break;
     case Token::kDIV: __ fdivd(V0, V0, V1); break;
     default: UNREACHABLE();
   }
   const Class& double_class = Class::Handle(
       Isolate::Current()->object_store()->double_class());
-  __ TryAllocate(double_class, &fall_through, R0, kNoPP);
+  __ TryAllocate(double_class, &fall_through, R0, R1, kNoPP);
   __ StoreDFieldToOffset(V0, R0, Double::value_offset(), kNoPP);
   __ ret();
   __ Bind(&fall_through);
 }
 
 
 void Intrinsifier::Double_add(Assembler* assembler) {
   DoubleArithmeticOperations(assembler, Token::kADD);
 }
 
@@ skipping 21 matching lines @@
   __ tsti(R0, kSmiTagMask);
   __ b(&fall_through, NE);
   // Is Smi.
   __ SmiUntag(R0);
   __ scvtfd(V1, R0);
   __ ldr(R0, Address(SP, 1 * kWordSize));
   __ LoadDFieldFromOffset(V0, R0, Double::value_offset(), kNoPP);
   __ fmuld(V0, V0, V1);
   const Class& double_class = Class::Handle(
       Isolate::Current()->object_store()->double_class());
-  __ TryAllocate(double_class, &fall_through, R0, kNoPP);
+  __ TryAllocate(double_class, &fall_through, R0, R1, kNoPP);
   __ StoreDFieldToOffset(V0, R0, Double::value_offset(), kNoPP);
   __ ret();
   __ Bind(&fall_through);
 }
 
 
 void Intrinsifier::Double_fromInteger(Assembler* assembler) {
   Label fall_through;
 
   __ ldr(R0, Address(SP, 0 * kWordSize));
   __ tsti(R0, kSmiTagMask);
   __ b(&fall_through, NE);
   // Is Smi.
   __ SmiUntag(R0);
   __ scvtfd(V0, R0);
   const Class& double_class = Class::Handle(
       Isolate::Current()->object_store()->double_class());
-  __ TryAllocate(double_class, &fall_through, R0, kNoPP);
+  __ TryAllocate(double_class, &fall_through, R0, R1, kNoPP);
   __ StoreDFieldToOffset(V0, R0, Double::value_offset(), kNoPP);
   __ ret();
   __ Bind(&fall_through);
 }
 
 
 void Intrinsifier::Double_getIsNaN(Assembler* assembler) {
   Label is_true;
   __ ldr(R0, Address(SP, 0 * kWordSize));
   __ LoadDFieldFromOffset(V0, R0, Double::value_offset(), kNoPP);
@@ skipping 59 matching lines @@
 
 void Intrinsifier::Math_sqrt(Assembler* assembler) {
   Label fall_through, is_smi, double_op;
   TestLastArgumentIsDouble(assembler, &is_smi, &fall_through);
   // Argument is double and is in R0.
   __ LoadDFieldFromOffset(V1, R0, Double::value_offset(), kNoPP);
   __ Bind(&double_op);
   __ fsqrtd(V0, V1);
   const Class& double_class = Class::Handle(
       Isolate::Current()->object_store()->double_class());
-  __ TryAllocate(double_class, &fall_through, R0, kNoPP);
+  __ TryAllocate(double_class, &fall_through, R0, R1, kNoPP);
   __ StoreDFieldToOffset(V0, R0, Double::value_offset(), kNoPP);
   __ ret();
   __ Bind(&is_smi);
   __ SmiUntag(R0);
   __ scvtfd(V1, R0);
   __ b(&double_op);
   __ Bind(&fall_through);
 }
 
 
@@ skipping 438 matching lines @@
   Isolate* isolate = Isolate::Current();
   __ LoadImmediate(R1, reinterpret_cast<uword>(isolate), kNoPP);
   // Set return value to Isolate::current_tag_.
   __ ldr(R0, Address(R1, Isolate::current_tag_offset()));
   __ ret();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64