ARM64: Optimize generated code for gaps

src/arm64/delayed-masm-arm64-inl.h

+// 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.
+
+#ifndef V8_ARM64_DELAYED_MASM_ARM64_INL_H_
+#define V8_ARM64_DELAYED_MASM_ARM64_INL_H_
+
+#include "src/arm64/delayed-masm-arm64.h"
+
+namespace v8 {
+namespace internal {
+
+#define __ ACCESS_MASM(masm_)
+
+
+void DelayedMasm::EndDelayedUse() {
+  EmitPending();
+
+  if (need_to_restore_root_) {
+    ASSERT(ScratchRegister().Is(root));
+    __ InitializeRootRegister();
+    need_to_restore_root_ = false;
+    ResetSavedValue();
+  }
+}
+
+
+void DelayedMasm::Mov(const Register& rd,
+                      const Operand& operand,
+                      DiscardMoveMode discard_mode) {
+  EmitPending();
+  __ Mov(rd, operand, discard_mode);
+  if (IsScratchRegister(rd)) {
+    if (operand.IsImmediate()) {
+      saved_value_ = operand.immediate();
+    } else {
+      ResetSavedValue();
+    }
+  }
+}
+
+
+void DelayedMasm::Fmov(FPRegister fd, FPRegister fn) {
+  EmitPending();
+  __ Fmov(fd, fn);
+}
+
+
+void DelayedMasm::Fmov(FPRegister fd, double imm) {
+  EmitPending();
+  __ Fmov(fd, imm);
+}
+
+
+void DelayedMasm::LoadObject(Register result, Handle<Object> object) {
+  EmitPending();
+  __ LoadObject(result, object);
+  if (IsScratchRegister(result)) {
+    ResetSavedValue();
+  }
+}
+
+
+#undef __
+
+} }  // namespace v8::internal
+
+#endif  // V8_ARM64_DELAYED_MASM_ARM64_INL_H_