[turbofan] Add backend support for signed loads.

src/compiler/x64/instruction-selector-x64.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/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
@@ skipping 39 matching lines @@
       }
       default:
         return false;
     }
   }
 };
 
 
 void InstructionSelector::VisitLoad(Node* node) {
   MachineType rep = RepresentationOf(OpParameter<MachineType>(node));
+  MachineType typ = TypeOf(OpParameter<MachineType>(node));
   X64OperandGenerator g(this);
   Node* base = node->InputAt(0);
   Node* index = node->InputAt(1);
 
   InstructionOperand* output = rep == kRepFloat64
                                    ? g.DefineAsDoubleRegister(node)
                                    : g.DefineAsRegister(node);
   ArchOpcode opcode;
   // TODO(titzer): signed/unsigned small loads
   switch (rep) {
     case kRepFloat64:
-      opcode = kSSELoad;
+      opcode = kX64Movsd;
       break;
     case kRepBit:  // Fall through.
     case kRepWord8:
-      opcode = kX64LoadWord8;
+      opcode = typ == kTypeInt32 ? kX64Movsxbl : kX64Movzxbl;
       break;
     case kRepWord16:
-      opcode = kX64LoadWord16;
+      opcode = typ == kTypeInt32 ? kX64Movsxwl : kX64Movzxwl;
       break;
     case kRepWord32:
-      opcode = kX64LoadWord32;
+      opcode = kX64Movl;
       break;
     case kRepTagged:  // Fall through.
     case kRepWord64:
-      opcode = kX64LoadWord64;
+      opcode = kX64Movq;
       break;
     default:
       UNREACHABLE();
       return;
   }
   if (g.CanBeImmediate(base)) {
     // load [#base + %index]
     Emit(opcode | AddressingModeField::encode(kMode_MRI), output,
          g.UseRegister(index), g.UseImmediate(base));
   } else if (g.CanBeImmediate(index)) {  // load [%base + #index]
@@ skipping 20 matching lines @@
     // TODO(dcarney): refactor RecordWrite function to take temp registers
     //                and pass them here instead of using fixed regs
     // TODO(dcarney): handle immediate indices.
     InstructionOperand* temps[] = {g.TempRegister(rcx), g.TempRegister(rdx)};
     Emit(kX64StoreWriteBarrier, NULL, g.UseFixed(base, rbx),
          g.UseFixed(index, rcx), g.UseFixed(value, rdx), ARRAY_SIZE(temps),
          temps);
     return;
   }
   DCHECK_EQ(kNoWriteBarrier, store_rep.write_barrier_kind);
-  bool is_immediate = false;
   InstructionOperand* val;
   if (rep == kRepFloat64) {
     val = g.UseDoubleRegister(value);
   } else {
-    is_immediate = g.CanBeImmediate(value);
-    if (is_immediate) {
+    if (g.CanBeImmediate(value)) {
       val = g.UseImmediate(value);
     } else if (rep == kRepWord8 || rep == kRepBit) {
       val = g.UseByteRegister(value);
     } else {
       val = g.UseRegister(value);
     }
   }
   ArchOpcode opcode;
   switch (rep) {
     case kRepFloat64:
-      opcode = kSSEStore;
+      opcode = kX64Movsd;
       break;
     case kRepBit:  // Fall through.
     case kRepWord8:
-      opcode = is_immediate ? kX64StoreWord8I : kX64StoreWord8;
+      opcode = kX64Movb;
       break;
     case kRepWord16:
-      opcode = is_immediate ? kX64StoreWord16I : kX64StoreWord16;
+      opcode = kX64Movw;
       break;
     case kRepWord32:
-      opcode = is_immediate ? kX64StoreWord32I : kX64StoreWord32;
+      opcode = kX64Movl;
       break;
     case kRepTagged:  // Fall through.
     case kRepWord64:
-      opcode = is_immediate ? kX64StoreWord64I : kX64StoreWord64;
+      opcode = kX64Movq;
       break;
     default:
       UNREACHABLE();
       return;
   }
   if (g.CanBeImmediate(base)) {
     // store [#base + %index], %|#value
     Emit(opcode | AddressingModeField::encode(kMode_MRI), NULL,
          g.UseRegister(index), g.UseImmediate(base), val);
   } else if (g.CanBeImmediate(index)) {  // store [%base + #index], %|#value
@@ skipping 569 matching lines @@
     DCHECK(deoptimization == NULL && continuation == NULL);
     Emit(kPopStack |
              MiscField::encode(static_cast<int>(buffer.pushed_nodes.size())),
          NULL);
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8