Implement optional turbofan UnalignedLoad and UnalignedStore operators

src/mips/assembler-mips.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 1811 matching lines @@
   if (is_int16(rs.offset_)) {
     GenInstrImmediate(LW, rs.rm(), rd, rs.offset_);
   } else {  // Offset > 16 bits, use multiple instructions to load.
     LoadRegPlusOffsetToAt(rs);
     GenInstrImmediate(LW, at, rd, 0);  // Equiv to lw(rd, MemOperand(at, 0));
   }
 }
 
 
 void Assembler::lwl(Register rd, const MemOperand& rs) {
+  DCHECK(is_int16(rs.offset_));
   GenInstrImmediate(LWL, rs.rm(), rd, rs.offset_);
 }
 
 
 void Assembler::lwr(Register rd, const MemOperand& rs) {
+  DCHECK(is_int16(rs.offset_));
   GenInstrImmediate(LWR, rs.rm(), rd, rs.offset_);
 }
 
 
 void Assembler::sb(Register rd, const MemOperand& rs) {
   if (is_int16(rs.offset_)) {
     GenInstrImmediate(SB, rs.rm(), rd, rs.offset_);
   } else {  // Offset > 16 bits, use multiple instructions to store.
     LoadRegPlusOffsetToAt(rs);
     GenInstrImmediate(SB, at, rd, 0);  // Equiv to sb(rd, MemOperand(at, 0));
@@ skipping 15 matching lines @@
   if (is_int16(rs.offset_)) {
     GenInstrImmediate(SW, rs.rm(), rd, rs.offset_);
   } else {  // Offset > 16 bits, use multiple instructions to store.
     LoadRegPlusOffsetToAt(rs);
     GenInstrImmediate(SW, at, rd, 0);  // Equiv to sw(rd, MemOperand(at, 0));
   }
 }
 
 
 void Assembler::swl(Register rd, const MemOperand& rs) {
+  DCHECK(is_int16(rs.offset_));
   GenInstrImmediate(SWL, rs.rm(), rd, rs.offset_);
 }
 
 
 void Assembler::swr(Register rd, const MemOperand& rs) {
+  DCHECK(is_int16(rs.offset_));
   GenInstrImmediate(SWR, rs.rm(), rd, rs.offset_);
 }
 
 
 void Assembler::lui(Register rd, int32_t j) {
   DCHECK(is_uint16(j));
   GenInstrImmediate(LUI, zero_reg, rd, j);
 }
 
 
@@ skipping 1265 matching lines @@
 
   if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
     Assembler::FlushICache(isolate, pc, 2 * sizeof(int32_t));
   }
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS