[x86] Disable invalid checked load/store optimization.

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 212 matching lines @@
     case kRepFloat32:
       opcode = kCheckedLoadFloat32;
       break;
     case kRepFloat64:
       opcode = kCheckedLoadFloat64;
       break;
     default:
       UNREACHABLE();
       return;
   }
-  if (offset->opcode() == IrOpcode::kInt32Add && CanCover(node, offset)) {
-    Int32Matcher mlength(length);
-    Int32BinopMatcher moffset(offset);
-    if (mlength.HasValue() && moffset.right().HasValue() &&
-        mlength.Value() > moffset.right().Value()) {
-      InstructionOperand* offset_operand = g.UseRegister(moffset.left().node());
-      InstructionOperand* length_operand =
-          g.TempImmediate(mlength.Value() - moffset.right().Value());
-      Emit(opcode | AddressingModeField::encode(kMode_MR1I),
-           g.DefineAsRegister(node), offset_operand, length_operand,
-           g.UseRegister(buffer), offset_operand,
-           g.UseImmediate(moffset.right().node()));
-      return;
-    }
-  }
   InstructionOperand* offset_operand = g.UseRegister(offset);
   InstructionOperand* length_operand =
       g.CanBeImmediate(length) ? g.UseImmediate(length) : g.UseRegister(length);
   Emit(opcode | AddressingModeField::encode(kMode_MR1),
        g.DefineAsRegister(node), offset_operand, length_operand,
        g.UseRegister(buffer), offset_operand);
 }
 
 
 void InstructionSelector::VisitCheckedStore(Node* node) {
@@ skipping 19 matching lines @@
       break;
     case kRepFloat64:
       opcode = kCheckedStoreFloat64;
       break;
     default:
       UNREACHABLE();
       return;
   }
   InstructionOperand* value_operand =
       g.CanBeImmediate(value) ? g.UseImmediate(value) : g.UseRegister(value);
-  if (offset->opcode() == IrOpcode::kInt32Add && CanCover(node, offset)) {
-    Int32Matcher mlength(length);
-    Int32BinopMatcher moffset(offset);
-    if (mlength.HasValue() && moffset.right().HasValue() &&
-        mlength.Value() > moffset.right().Value()) {
-      InstructionOperand* offset_operand = g.UseRegister(moffset.left().node());
-      InstructionOperand* length_operand =
-          g.TempImmediate(mlength.Value() - moffset.right().Value());
-      Emit(opcode | AddressingModeField::encode(kMode_MR1I), nullptr,
-           offset_operand, length_operand, value_operand, g.UseRegister(buffer),
-           offset_operand, g.UseImmediate(moffset.right().node()));
-      return;
-    }
-  }
   InstructionOperand* offset_operand = g.UseRegister(offset);
   InstructionOperand* length_operand =
       g.CanBeImmediate(length) ? g.UseImmediate(length) : g.UseRegister(length);
   Emit(opcode | AddressingModeField::encode(kMode_MR1), nullptr, offset_operand,
        length_operand, value_operand, g.UseRegister(buffer), offset_operand);
 }
 
 
 // Shared routine for multiple binary operations.
 static void VisitBinop(InstructionSelector* selector, Node* node,
@@ skipping 1003 matching lines @@
            MachineOperatorBuilder::kFloat64Ceil |
            MachineOperatorBuilder::kFloat64RoundTruncate |
            MachineOperatorBuilder::kWord32ShiftIsSafe;
   }
   return MachineOperatorBuilder::kNoFlags;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8