Revert "Add signed/unsigned 8-bit and 16-bit Representations to Crankshaft"

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index ab959726776a31fc84785daea221615f79adc5ec..1a8b996e8594293fb0d78fe2064b412502a64c8b 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -3273,7 +3273,12 @@ void LCodeGen::DoLoadNamedField(LLoadNamedField* instr) {
         ? MemOperand::StaticVariable(ToExternalReference(
                 LConstantOperand::cast(instr->object())))
         : MemOperand(ToRegister(instr->object()), offset);
-    __ Load(result, operand, access.representation());
+    if (access.representation().IsByte()) {
+      ASSERT(instr->hydrogen()->representation().IsInteger32());
+      __ movzx_b(result, operand);
+    } else {
+      __ mov(result, operand);
+    }
     return;
   }
 
@@ -3295,7 +3300,12 @@ void LCodeGen::DoLoadNamedField(LLoadNamedField* instr) {
     __ mov(result, FieldOperand(object, JSObject::kPropertiesOffset));
     object = result;
   }
-  __ Load(result, FieldOperand(object, offset), access.representation());
+  if (access.representation().IsByte()) {
+    ASSERT(instr->hydrogen()->representation().IsInteger32());
+    __ movzx_b(result, FieldOperand(object, offset));
+  } else {
+    __ mov(result, FieldOperand(object, offset));
+  }
 }
 
 
@@ -4468,11 +4478,16 @@ void LCodeGen::DoStoreNamedField(LStoreNamedField* instr) {
             ToExternalReference(LConstantOperand::cast(instr->object())))
         : MemOperand(ToRegister(instr->object()), offset);
     if (instr->value()->IsConstantOperand()) {
+      ASSERT(!representation.IsByte());
       LConstantOperand* operand_value = LConstantOperand::cast(instr->value());
       __ mov(operand, Immediate(ToInteger32(operand_value)));
     } else {
       Register value = ToRegister(instr->value());
-      __ Store(value, operand, representation);
+      if (representation.IsByte()) {
+        __ mov_b(operand, value);
+      } else {
+        __ mov(operand, value);
+      }
     }
     return;
   }
@@ -4550,7 +4565,11 @@ void LCodeGen::DoStoreNamedField(LStoreNamedField* instr) {
     LConstantOperand* operand_value = LConstantOperand::cast(instr->value());
     if (operand_value->IsRegister()) {
       Register value = ToRegister(operand_value);
-      __ Store(value, operand, representation);
+      if (representation.IsByte()) {
+        __ mov_b(operand, value);
+      } else {
+        __ mov(operand, value);
+      }
     } else {
       Handle<Object> handle_value = ToHandle(operand_value);
       ASSERT(!instr->hydrogen()->NeedsWriteBarrier());
@@ -4558,7 +4577,11 @@ void LCodeGen::DoStoreNamedField(LStoreNamedField* instr) {
     }
   } else {
     Register value = ToRegister(instr->value());
-    __ Store(value, operand, representation);
+    if (representation.IsByte()) {
+      __ mov_b(operand, value);
+    } else {
+      __ mov(operand, value);
+    }
   }
 
   if (instr->hydrogen()->NeedsWriteBarrier()) {