[turbofan] Add backend support for signed loads.

src/compiler/ia32/instruction-selector-ia32.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"
 #include "src/compiler/node-properties-inl.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 24 matching lines @@
       }
       default:
         return false;
     }
   }
 };
 
 
 void InstructionSelector::VisitLoad(Node* node) {
   MachineType rep = RepresentationOf(OpParameter<MachineType>(node));
+  MachineType typ = TypeOf(OpParameter<MachineType>(node));
   IA32OperandGenerator 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 = kIA32Movsd;
       break;
     case kRepBit:  // Fall through.
     case kRepWord8:
-      opcode = kIA32LoadWord8;
+      opcode = typ == kTypeInt32 ? kIA32Movsxbl : kIA32Movzxbl;
       break;
     case kRepWord16:
-      opcode = kIA32LoadWord16;
+      opcode = typ == kTypeInt32 ? kIA32Movsxwl : kIA32Movzxwl;
       break;
     case kRepTagged:  // Fall through.
     case kRepWord32:
-      opcode = kIA32LoadWord32;
+      opcode = kIA32Movl;
       break;
     default:
       UNREACHABLE();
       return;
   }
   if (g.CanBeImmediate(base)) {
     if (Int32Matcher(index).Is(0)) {  // load [#base + #0]
       Emit(opcode | AddressingModeField::encode(kMode_MI), output,
            g.UseImmediate(base));
     } else {  // load [#base + %index]
@@ skipping 24 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(ecx), g.TempRegister(edx)};
     Emit(kIA32StoreWriteBarrier, NULL, g.UseFixed(base, ebx),
          g.UseFixed(index, ecx), g.UseFixed(value, edx), 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 = kIA32Movsd;
       break;
     case kRepBit:  // Fall through.
     case kRepWord8:
-      opcode = is_immediate ? kIA32StoreWord8I : kIA32StoreWord8;
+      opcode = kIA32Movb;
       break;
     case kRepWord16:
-      opcode = is_immediate ? kIA32StoreWord16I : kIA32StoreWord16;
+      opcode = kIA32Movw;
       break;
     case kRepTagged:  // Fall through.
     case kRepWord32:
-      opcode = is_immediate ? kIA32StoreWord32I : kIA32StoreWord32;
+      opcode = kIA32Movl;
       break;
     default:
       UNREACHABLE();
       return;
   }
   if (g.CanBeImmediate(base)) {
     if (Int32Matcher(index).Is(0)) {  // store [#base], %|#value
       Emit(opcode | AddressingModeField::encode(kMode_MI), NULL,
            g.UseImmediate(base), val);
     } else {  // store [#base + %index], %|#value
@@ skipping 416 matching lines @@
   if (descriptor->kind() == CallDescriptor::kCallAddress &&
       buffer.pushed_nodes.size() > 0) {
     DCHECK(deoptimization == NULL && continuation == NULL);
     Emit(kPopStack | MiscField::encode(buffer.pushed_nodes.size()), NULL);
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8