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

src/mips64/macro-assembler-mips64.cc

Index: src/mips64/macro-assembler-mips64.cc
diff --git a/src/mips64/macro-assembler-mips64.cc b/src/mips64/macro-assembler-mips64.cc
index 3185285a461e500b895967a4a0de59901e7b0f3c..31ab175edcb3237bd07f8018c90648f9b5ae3a95 100644
--- a/src/mips64/macro-assembler-mips64.cc
+++ b/src/mips64/macro-assembler-mips64.cc
@@ -4706,90 +4706,6 @@ void MacroAssembler::AllocateJSValue(Register result, Register constructor,
   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));
-  Daddu(src, src, 1);
-  sb(scratch, MemOperand(dst));
-  Daddu(dst, dst, 1);
-  Dsubu(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));
-  ld(scratch, MemOperand(src));
-  Daddu(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));
-    dsrl(scratch, scratch, 8);
-    sb(scratch, MemOperand(dst, 1));
-    dsrl(scratch, scratch, 8);
-    sb(scratch, MemOperand(dst, 2));
-    dsrl(scratch, scratch, 8);
-    sb(scratch, MemOperand(dst, 3));
-    dsrl(scratch, scratch, 8);
-    sb(scratch, MemOperand(dst, 4));
-    dsrl(scratch, scratch, 8);
-    sb(scratch, MemOperand(dst, 5));
-    dsrl(scratch, scratch, 8);
-    sb(scratch, MemOperand(dst, 6));
-    dsrl(scratch, scratch, 8);
-    sb(scratch, MemOperand(dst, 7));
-  } else {
-    sb(scratch, MemOperand(dst, 7));
-    dsrl(scratch, scratch, 8);
-    sb(scratch, MemOperand(dst, 6));
-    dsrl(scratch, scratch, 8);
-    sb(scratch, MemOperand(dst, 5));
-    dsrl(scratch, scratch, 8);
-    sb(scratch, MemOperand(dst, 4));
-    dsrl(scratch, scratch, 8);
-    sb(scratch, MemOperand(dst, 3));
-    dsrl(scratch, scratch, 8);
-    sb(scratch, MemOperand(dst, 2));
-    dsrl(scratch, scratch, 8);
-    sb(scratch, MemOperand(dst, 1));
-    dsrl(scratch, scratch, 8);
-    sb(scratch, MemOperand(dst, 0));
-  }
-  Daddu(dst, dst, 8);
-
-  Dsubu(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));
-  Daddu(src, src, 1);
-  sb(scratch, MemOperand(dst));
-  Daddu(dst, dst, 1);
-  Dsubu(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) {