[stubs] Remove StringIndexOfChar

src/code-stub-assembler.cc

Index: src/code-stub-assembler.cc
diff --git a/src/code-stub-assembler.cc b/src/code-stub-assembler.cc
index ad0dd093eafa0fd8c629bdbd854504c596dff425..018d882c75f58e06b1410314deb823e59895cfad 100644
--- a/src/code-stub-assembler.cc
+++ b/src/code-stub-assembler.cc
@@ -3732,73 +3732,6 @@ Node* CodeStubAssembler::StringAdd(Node* context, Node* left, Node* right,
   return result.value();
 }
 
-Node* CodeStubAssembler::StringIndexOfChar(Node* context, Node* string,
-                                           Node* needle_char, Node* from) {
-  CSA_ASSERT(this, IsString(string));
-  Variable var_result(this, MachineRepresentation::kTagged);
-
-  Label out(this), runtime(this, Label::kDeferred);
-
-  // Let runtime handle non-one-byte {needle_char}.
-
-  Node* const one_byte_char_mask = Int32Constant(0xFF);
-  GotoUnless(
-      Word32Equal(Word32And(needle_char, one_byte_char_mask), needle_char),
-      &runtime);
-
-  // TODO(jgruber): Handle external and two-byte strings.
-
-  Node* const one_byte_seq_mask = Int32Constant(
-      kIsIndirectStringMask | kExternalStringTag | kStringEncodingMask);
-  Node* const expected_masked = Int32Constant(kOneByteStringTag);
-
-  Node* const string_instance_type = LoadInstanceType(string);
-  GotoUnless(Word32Equal(Word32And(string_instance_type, one_byte_seq_mask),
-                         expected_masked),
-             &runtime);
-
-  // If we reach this, {string} is a non-indirect, non-external one-byte string.
-
-  Node* const length = LoadStringLength(string);
-  Node* const search_range_length = SmiUntag(SmiSub(length, from));
-
-  const int offset = SeqOneByteString::kHeaderSize - kHeapObjectTag;
-  Node* const begin = IntPtrConstant(offset);
-  Node* const cursor = IntPtrAdd(begin, SmiUntag(from));
-  Node* const end = IntPtrAdd(cursor, search_range_length);
-
-  var_result.Bind(SmiConstant(Smi::FromInt(-1)));
-
-  BuildFastLoop(
-      cursor, end,
-      [this, string, needle_char, begin, &var_result, &out](Node* cursor) {
-        Label next(this);
-        Node* value = Load(MachineType::Uint8(), string, cursor);
-        GotoUnless(Word32Equal(value, needle_char), &next);
-
-        // Found a match.
-        Node* index = SmiTag(IntPtrSub(cursor, begin));
-        var_result.Bind(index);
-        Goto(&out);
-
-        Bind(&next);
-      },
-      1, INTPTR_PARAMETERS, IndexAdvanceMode::kPost);
-  Goto(&out);
-
-  Bind(&runtime);
-  {
-    Node* const pattern = StringFromCharCode(needle_char);
-    Node* const result =
-        CallRuntime(Runtime::kStringIndexOf, context, string, pattern, from);
-    var_result.Bind(result);
-    Goto(&out);
-  }
-
-  Bind(&out);
-  return var_result.value();
-}
-
 Node* CodeStubAssembler::StringFromCodePoint(Node* codepoint,
                                              UnicodeEncoding encoding) {
   Variable var_result(this, MachineRepresentation::kTagged,