optimization: get rid of QString::fromUtf16() usage

QString::fromUtf16() is slow - it does a BOM check and optionally byte
swapping, which is utterly pointless when converting internal data
structures which are raw utf16 in host byte order anyway. so replace
it with QString::fromRawData() (for short-lived strings) or
QString(const QChar *, int) (otherwise) if possible.

Reviewed-by: axis
Reviewed-by: mariusSO
Reviewed-by: Bill King

1 files changed, 2 insertions, 2 deletions

diff --git a/src/sql/drivers/sqlite/qsql_sqlite.cpp b/src/sql/drivers/sqlite/qsql_sqlite.cpp
index 9dbefaf278..9fff552800 100644
--- a/src/sql/drivers/sqlite/qsql_sqlite.cpp
+++ b/src/sql/drivers/sqlite/qsql_sqlite.cpp
@@ -245,9 +245,9 @@ bool QSQLiteResultPrivate::fetchNext(QSqlCachedResult::ValueCache &values, int i
                 values[i + idx] = QVariant(QVariant::String);
                 break;
             default:
-                values[i + idx] = QString::fromUtf16(static_cast<const ushort *>(
+                values[i + idx] = QString(reinterpret_cast<const QChar *>(
                             sqlite3_column_text16(stmt, i)),
-                            sqlite3_column_bytes16(stmt, i) / sizeof(ushort));
+                            sqlite3_column_bytes16(stmt, i) / sizeof(QChar));
                 break;
             }
         }