[turbofan] Do not lower (One|Two)ByteSeqString(Get|Set)Char intrinsics.

src/compiler/js-intrinsic-lowering.cc

 // Copyright 2015 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/js-intrinsic-lowering.h"
 
 #include <stack>
 
 #include "src/code-factory.h"
 #include "src/compiler/access-builder.h"
@@ skipping 56 matching lines @@
     case Runtime::kInlineJSValueGetValue:
       return ReduceJSValueGetValue(node);
     case Runtime::kInlineMapGetInstanceType:
       return ReduceMapGetInstanceType(node);
     case Runtime::kInlineMathClz32:
       return ReduceMathClz32(node);
     case Runtime::kInlineMathFloor:
       return ReduceMathFloor(node);
     case Runtime::kInlineMathSqrt:
       return ReduceMathSqrt(node);
-    case Runtime::kInlineOneByteSeqStringGetChar:
-      return ReduceSeqStringGetChar(node, String::ONE_BYTE_ENCODING);
-    case Runtime::kInlineOneByteSeqStringSetChar:
-      return ReduceSeqStringSetChar(node, String::ONE_BYTE_ENCODING);
     case Runtime::kInlineStringGetLength:
       return ReduceStringGetLength(node);
-    case Runtime::kInlineTwoByteSeqStringGetChar:
-      return ReduceSeqStringGetChar(node, String::TWO_BYTE_ENCODING);
-    case Runtime::kInlineTwoByteSeqStringSetChar:
-      return ReduceSeqStringSetChar(node, String::TWO_BYTE_ENCODING);
     case Runtime::kInlineValueOf:
       return ReduceValueOf(node);
     case Runtime::kInlineIsMinusZero:
       return ReduceIsMinusZero(node);
     case Runtime::kInlineFixedArrayGet:
       return ReduceFixedArrayGet(node);
     case Runtime::kInlineFixedArraySet:
       return ReduceFixedArraySet(node);
     case Runtime::kInlineGetTypeFeedbackVector:
       return ReduceGetTypeFeedbackVector(node);
@@ skipping 232 matching lines @@
   if (!machine()->Float64RoundDown().IsSupported()) return NoChange();
   return Change(node, machine()->Float64RoundDown().op());
 }
 
 
 Reduction JSIntrinsicLowering::ReduceMathSqrt(Node* node) {
   return Change(node, machine()->Float64Sqrt());
 }
 
 
-Reduction JSIntrinsicLowering::ReduceSeqStringGetChar(
-    Node* node, String::Encoding encoding) {
-  Node* effect = NodeProperties::GetEffectInput(node);
-  Node* control = NodeProperties::GetControlInput(node);
-  RelaxControls(node);
-  node->ReplaceInput(2, effect);
-  node->ReplaceInput(3, control);
-  node->TrimInputCount(4);
-  NodeProperties::ChangeOp(
-      node,
-      simplified()->LoadElement(AccessBuilder::ForSeqStringChar(encoding)));
-  return Changed(node);
-}
-
-
-Reduction JSIntrinsicLowering::ReduceSeqStringSetChar(
-    Node* node, String::Encoding encoding) {
-  // Note: The intrinsic has a strange argument order, so we need to reshuffle.
-  Node* index = NodeProperties::GetValueInput(node, 0);
-  Node* chr = NodeProperties::GetValueInput(node, 1);
-  Node* string = NodeProperties::GetValueInput(node, 2);
-  Node* effect = NodeProperties::GetEffectInput(node);
-  Node* control = NodeProperties::GetControlInput(node);
-  ReplaceWithValue(node, string, node);
-  NodeProperties::RemoveType(node);
-  node->ReplaceInput(0, string);
-  node->ReplaceInput(1, index);
-  node->ReplaceInput(2, chr);
-  node->ReplaceInput(3, effect);
-  node->ReplaceInput(4, control);
-  node->TrimInputCount(5);
-  NodeProperties::ChangeOp(
-      node,
-      simplified()->StoreElement(AccessBuilder::ForSeqStringChar(encoding)));
-  return Changed(node);
-}
-
-
 Reduction JSIntrinsicLowering::ReduceStringGetLength(Node* node) {
   Node* value = NodeProperties::GetValueInput(node, 0);
   Node* effect = NodeProperties::GetEffectInput(node);
   Node* control = NodeProperties::GetControlInput(node);
   return Change(node, simplified()->LoadField(AccessBuilder::ForStringLength()),
                 value, effect, control);
 }
 
 
 Reduction JSIntrinsicLowering::ReduceValueOf(Node* node) {
@@ skipping 344 matching lines @@
 }
 
 
 SimplifiedOperatorBuilder* JSIntrinsicLowering::simplified() const {
   return jsgraph()->simplified();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8