On Itanium, each register contains a trap bit. Any uninitialized value might be a trap representation on that architecture.<p><a href="https:&#x2F;&#x2F;blogs.msdn.microsoft.com&#x2F;oldnewthing&#x2F;20040119-00&#x2F;?p=41003&#x2F;" rel="nofollow">https:&#x2F;&#x2F;blogs.msdn.microsoft.com&#x2F;oldnewthing&#x2F;20040119-00&#x2F;?p=...</a>