[Turbofan] Register-register swap for x64 can use movapd instruction.

src/compiler/x64/code-generator-x64.cc

 // Copyright 2013 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/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 2426 matching lines @@
       __ Movups(src, kScratchDoubleReg);
       __ Xorps(kScratchDoubleReg, dst);  // scratch contains src.
       __ Movups(dst, kScratchDoubleReg);
       __ Xorps(kScratchDoubleReg, src);  // scratch contains dst.
       __ Movups(src, kScratchDoubleReg);
     }
   } else if (source->IsFPRegister() && destination->IsFPRegister()) {
     // XMM register-register swap.
     XMMRegister src = g.ToDoubleRegister(source);
     XMMRegister dst = g.ToDoubleRegister(destination);
-    MachineRepresentation rep = LocationOperand::cast(source)->representation();
-    if (rep != MachineRepresentation::kSimd128) {
-      __ Movapd(kScratchDoubleReg, src);
-      __ Movapd(src, dst);
-      __ Movapd(dst, kScratchDoubleReg);
-    } else {
-      __ Movups(kScratchDoubleReg, src);
-      __ Movups(src, dst);
-      __ Movups(dst, kScratchDoubleReg);
-    }
+    __ Movapd(kScratchDoubleReg, src);
+    __ Movapd(src, dst);
+    __ Movapd(dst, kScratchDoubleReg);
   } else if (source->IsFPRegister() && destination->IsFPStackSlot()) {
     // XMM register-memory swap.
     XMMRegister src = g.ToDoubleRegister(source);
     Operand dst = g.ToOperand(destination);
     MachineRepresentation rep = LocationOperand::cast(source)->representation();
     if (rep != MachineRepresentation::kSimd128) {
       __ Movsd(kScratchDoubleReg, src);
       __ Movsd(src, dst);
       __ Movsd(dst, kScratchDoubleReg);
     } else {
@@ skipping 28 matching lines @@
     int padding_size = last_lazy_deopt_pc_ + space_needed - current_pc;
     __ Nop(padding_size);
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8