[turbofan] Add backend support for signed loads.

src/compiler/arm64/code-generator-arm64.cc

 // Copyright 2014 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 "src/compiler/code-generator.h"
 
 #include "src/arm64/macro-assembler-arm64.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 378 matching lines @@
       break;
     case kArm64Float64ToUint32:
       __ Fcvtzu(i.OutputRegister32(), i.InputDoubleRegister(0));
       break;
     case kArm64Int32ToFloat64:
       __ Scvtf(i.OutputDoubleRegister(), i.InputRegister32(0));
       break;
     case kArm64Uint32ToFloat64:
       __ Ucvtf(i.OutputDoubleRegister(), i.InputRegister32(0));
       break;
-    case kArm64LoadWord8:
+    case kArm64Ldrb:
       __ Ldrb(i.OutputRegister(), i.MemoryOperand());
       break;
-    case kArm64StoreWord8:
+    case kArm64Ldrsb:
+      __ Ldrsb(i.OutputRegister(), i.MemoryOperand());
+      break;
+    case kArm64Strb:
       __ Strb(i.InputRegister(2), i.MemoryOperand());
       break;
-    case kArm64LoadWord16:
+    case kArm64Ldrh:
       __ Ldrh(i.OutputRegister(), i.MemoryOperand());
       break;
-    case kArm64StoreWord16:
+    case kArm64Ldrsh:
+      __ Ldrsh(i.OutputRegister(), i.MemoryOperand());
+      break;
+    case kArm64Strh:
       __ Strh(i.InputRegister(2), i.MemoryOperand());
       break;
-    case kArm64LoadWord32:
+    case kArm64LdrW:
       __ Ldr(i.OutputRegister32(), i.MemoryOperand());
       break;
-    case kArm64StoreWord32:
+    case kArm64StrW:
       __ Str(i.InputRegister32(2), i.MemoryOperand());
       break;
-    case kArm64LoadWord64:
+    case kArm64Ldr:
       __ Ldr(i.OutputRegister(), i.MemoryOperand());
       break;
-    case kArm64StoreWord64:
+    case kArm64Str:
       __ Str(i.InputRegister(2), i.MemoryOperand());
       break;
-    case kArm64Float64Load:
+    case kArm64LdrD:
       __ Ldr(i.OutputDoubleRegister(), i.MemoryOperand());
       break;
-    case kArm64Float64Store:
+    case kArm64StrD:
       __ Str(i.InputDoubleRegister(2), i.MemoryOperand());
       break;
     case kArm64StoreWriteBarrier: {
       Register object = i.InputRegister(0);
       Register index = i.InputRegister(1);
       Register value = i.InputRegister(2);
       __ Add(index, object, Operand(index, SXTW));
       __ Str(value, MemOperand(index));
       SaveFPRegsMode mode = code_->frame()->DidAllocateDoubleRegisters()
                                 ? kSaveFPRegs
@@ skipping 390 matching lines @@
 }
 
 
 void CodeGenerator::AddNopForSmiCodeInlining() { __ movz(xzr, 0); }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8