ARM64: optimize call immediate

src/arm64/assembler-arm64.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 800 matching lines @@
       Address constant_pool_entry, Code* code, Address target);
 
   // All addresses in the constant pool are the same size as pointers.
   static const int kSpecialTargetSize = kPointerSize;
 
   // The sizes of the call sequences emitted by MacroAssembler::Call.
   // Wherever possible, use MacroAssembler::CallSize instead of these constants,
   // as it will choose the correct value for a given relocation mode.
   //
   // Without relocation:
-  //  movz  ip0, #(target & 0x000000000000ffff)
-  //  movk  ip0, #(target & 0x00000000ffff0000)
-  //  movk  ip0, #(target & 0x0000ffff00000000)
-  //  movk  ip0, #(target & 0xffff000000000000)
-  //  blr   ip0
+  //  movz  temp, #(target & 0x000000000000ffff)
+  //  movk  temp, #(target & 0x00000000ffff0000)
+  //  movk  temp, #(target & 0x0000ffff00000000)
+  //  blr   temp
   //
   // With relocation:
-  //  ldr   ip0, =target
-  //  blr   ip0
-  static const int kCallSizeWithoutRelocation = 5 * kInstructionSize;
+  //  ldr   temp, =target
+  //  blr   temp
+  static const int kMaxCallSizeWithoutRelocation = 4 * kInstructionSize;
   static const int kCallSizeWithRelocation = 2 * kInstructionSize;
 
   // Size of the generated code in bytes
   uint64_t SizeOfGeneratedCode() const {
     ASSERT((pc_ >= buffer_) && (pc_ < (buffer_ + buffer_size_)));
     return pc_ - buffer_;
   }
 
   // Return the code size generated from label to the current position.
   uint64_t SizeOfCodeGeneratedSince(const Label* label) {
@@ skipping 1373 matching lines @@
 class EnsureSpace BASE_EMBEDDED {
  public:
   explicit EnsureSpace(Assembler* assembler) {
     assembler->CheckBuffer();
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM64_ASSEMBLER_ARM64_H_