[cleanup] Delete MacroAssembler::CopyBytes, it is dead code

src/mips/macro-assembler-mips.cc

 // Copyright 2012 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 <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #if V8_TARGET_ARCH_MIPS
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
@@ skipping 4555 matching lines @@
   // Initialize the JSValue.
   LoadGlobalFunctionInitialMap(constructor, scratch1, scratch2);
   sw(scratch1, FieldMemOperand(result, HeapObject::kMapOffset));
   LoadRoot(scratch1, Heap::kEmptyFixedArrayRootIndex);
   sw(scratch1, FieldMemOperand(result, JSObject::kPropertiesOffset));
   sw(scratch1, FieldMemOperand(result, JSObject::kElementsOffset));
   sw(value, FieldMemOperand(result, JSValue::kValueOffset));
   STATIC_ASSERT(JSValue::kSize == 4 * kPointerSize);
 }
 
-
-void MacroAssembler::CopyBytes(Register src,
-                               Register dst,
-                               Register length,
-                               Register scratch) {
-  Label align_loop_1, word_loop, byte_loop, byte_loop_1, done;
-
-  // Align src before copying in word size chunks.
-  Branch(&byte_loop, le, length, Operand(kPointerSize));
-  bind(&align_loop_1);
-  And(scratch, src, kPointerSize - 1);
-  Branch(&word_loop, eq, scratch, Operand(zero_reg));
-  lbu(scratch, MemOperand(src));
-  Addu(src, src, 1);
-  sb(scratch, MemOperand(dst));
-  Addu(dst, dst, 1);
-  Subu(length, length, Operand(1));
-  Branch(&align_loop_1, ne, length, Operand(zero_reg));
-
-  // Copy bytes in word size chunks.
-  bind(&word_loop);
-  if (emit_debug_code()) {
-    And(scratch, src, kPointerSize - 1);
-    Assert(eq, kExpectingAlignmentForCopyBytes,
-        scratch, Operand(zero_reg));
-  }
-  Branch(&byte_loop, lt, length, Operand(kPointerSize));
-  lw(scratch, MemOperand(src));
-  Addu(src, src, kPointerSize);
-
-  // TODO(kalmard) check if this can be optimized to use sw in most cases.
-  // Can't use unaligned access - copy byte by byte.
-  if (kArchEndian == kLittle) {
-    sb(scratch, MemOperand(dst, 0));
-    srl(scratch, scratch, 8);
-    sb(scratch, MemOperand(dst, 1));
-    srl(scratch, scratch, 8);
-    sb(scratch, MemOperand(dst, 2));
-    srl(scratch, scratch, 8);
-    sb(scratch, MemOperand(dst, 3));
-  } else {
-    sb(scratch, MemOperand(dst, 3));
-    srl(scratch, scratch, 8);
-    sb(scratch, MemOperand(dst, 2));
-    srl(scratch, scratch, 8);
-    sb(scratch, MemOperand(dst, 1));
-    srl(scratch, scratch, 8);
-    sb(scratch, MemOperand(dst, 0));
-  }
-
-  Addu(dst, dst, 4);
-
-  Subu(length, length, Operand(kPointerSize));
-  Branch(&word_loop);
-
-  // Copy the last bytes if any left.
-  bind(&byte_loop);
-  Branch(&done, eq, length, Operand(zero_reg));
-  bind(&byte_loop_1);
-  lbu(scratch, MemOperand(src));
-  Addu(src, src, 1);
-  sb(scratch, MemOperand(dst));
-  Addu(dst, dst, 1);
-  Subu(length, length, Operand(1));
-  Branch(&byte_loop_1, ne, length, Operand(zero_reg));
-  bind(&done);
-}
-
-
 void MacroAssembler::InitializeFieldsWithFiller(Register current_address,
                                                 Register end_address,
                                                 Register filler) {
   Label loop, entry;
   Branch(&entry);
   bind(&loop);
   sw(filler, MemOperand(current_address));
   Addu(current_address, current_address, kPointerSize);
   bind(&entry);
   Branch(&loop, ult, current_address, Operand(end_address));
@@ skipping 2223 matching lines @@
   if (mag.shift > 0) sra(result, result, mag.shift);
   srl(at, dividend, 31);
   Addu(result, result, Operand(at));
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS