[turbofan] Support for %_DoubleHi, %_DoubleLo and %_ConstructDouble.

src/compiler/arm64/code-generator-arm64.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/code-generator.h"
 
 #include "src/arm64/macro-assembler-arm64.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 675 matching lines @@
       break;
     case kArm64Float64ToUint32:
       __ Fcvtzu(i.OutputRegister32(), i.InputDoubleRegister(0));
       break;
     case kArm64Int32ToFloat64:
       __ Scvtf(i.OutputDoubleRegister(), i.InputRegister32(0));
       break;
     case kArm64Uint32ToFloat64:
       __ Ucvtf(i.OutputDoubleRegister(), i.InputRegister32(0));
       break;
+    case kArm64Float64ExtractLowWord32:
+      __ Fmov(i.OutputRegister32(), i.InputFloat32Register(0));
+      break;
+    case kArm64Float64ExtractHighWord32:
+      __ Fmov(i.OutputRegister(), i.InputFloat64Register(0));
+      __ Lsr(i.OutputRegister(), i.OutputRegister(), 32);
+      break;
+    case kArm64Float64InsertLowWord32: {
+      UseScratchRegisterScope scope(masm());
+      Register tmp = scope.AcquireX();
+      __ Fmov(tmp, i.InputFloat64Register(0));
+      __ Bfi(tmp, i.InputRegister(1), 0, 32);
+      __ Fmov(i.OutputFloat64Register(), tmp);
+      break;
+    }
+    case kArm64Float64InsertHighWord32: {
+      UseScratchRegisterScope scope(masm());
+      Register tmp = scope.AcquireX();
+      __ Fmov(tmp.W(), i.InputFloat32Register(0));
+      __ Bfi(tmp, i.InputRegister(1), 32, 32);
+      __ Fmov(i.OutputFloat64Register(), tmp);
+      break;
+    }
     case kArm64Ldrb:
       __ Ldrb(i.OutputRegister(), i.MemoryOperand());
       break;
     case kArm64Ldrsb:
       __ Ldrsb(i.OutputRegister(), i.MemoryOperand());
       break;
     case kArm64Strb:
       __ Strb(i.InputRegister(2), i.MemoryOperand());
       break;
     case kArm64Ldrh:
@@ skipping 456 matching lines @@
     }
   }
   MarkLazyDeoptSite();
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8