[turbofan] Add proper conversion operators for int32<->int64.

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 256 matching lines @@
       break;
     case kArm64Sar32:
       ASSEMBLE_SHIFT(Asr, 32);
       break;
     case kArm64Ror:
       ASSEMBLE_SHIFT(Ror, 64);
       break;
     case kArm64Ror32:
       ASSEMBLE_SHIFT(Ror, 32);
       break;
+    case kArm64Mov32:
+      __ Mov(i.OutputRegister32(), i.InputRegister32(0));
+      break;
+    case kArm64Sxtw:
+      __ Sxtw(i.OutputRegister(), i.InputRegister32(0));
+      break;
     case kArm64CallCodeObject: {
       if (instr->InputAt(0)->IsImmediate()) {
         Handle<Code> code = Handle<Code>::cast(i.InputHeapObject(0));
         __ Call(code, RelocInfo::CODE_TARGET);
         RecordSafepoint(instr->pointer_map(), Safepoint::kSimple, 0,
                         Safepoint::kNoLazyDeopt);
       } else {
         Register reg = i.InputRegister(0);
         int entry = Code::kHeaderSize - kHeapObjectTag;
         __ Ldr(reg, MemOperand(reg, entry));
@@ skipping 89 matching lines @@
       // TODO(dcarney): implement directly. See note in lithium-codegen-arm64.cc
       FrameScope scope(masm(), StackFrame::MANUAL);
       DCHECK(d0.is(i.InputDoubleRegister(0)));
       DCHECK(d1.is(i.InputDoubleRegister(1)));
       DCHECK(d0.is(i.OutputDoubleRegister()));
       // TODO(dcarney): make sure this saves all relevant registers.
       __ CallCFunction(ExternalReference::mod_two_doubles_operation(isolate()),
                        0, 2);
       break;
     }
-    case kArm64Int32ToInt64:
-      __ Sxtw(i.OutputRegister(), i.InputRegister(0));
-      break;
-    case kArm64Int64ToInt32:
-      if (!i.OutputRegister().is(i.InputRegister(0))) {
-        __ Mov(i.OutputRegister(), i.InputRegister(0));
-      }
-      break;
     case kArm64Float64ToInt32:
       __ Fcvtzs(i.OutputRegister32(), i.InputDoubleRegister(0));
       break;
     case kArm64Float64ToUint32:
       __ Fcvtzu(i.OutputRegister32(), i.InputDoubleRegister(0));
       break;
     case kArm64Int32ToFloat64:
       __ Scvtf(i.OutputDoubleRegister(), i.InputRegister32(0));
       break;
     case kArm64Uint32ToFloat64:
@@ skipping 430 matching lines @@
 }
 
 
 void CodeGenerator::AddNopForSmiCodeInlining() { __ movz(xzr, 0); }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8