TAIPEI : The CEO of chipmaker TSMC <2330.TW> will hold a press conference at Taiwan's presidential office at 5:00 p.m. local time (0900 GMT) on Thursday, the president's office said, days after the company announced major investment in the U.S. which requires government approval. No further details were given. Earlier this week, the world's largest contract chipmaker announced a fresh $100 billion investment in the U.S. that involves building five additional chip facilities there amid threats