[llvm-commits] Thread Sanitizer seems to have the dual issue

[Chandler Carruth]

On Thu, Nov 29, 2012 at 1:20 AM, Chandler Carruth <chandlerc at google.com> wrote:
> You shouldn't see any performance degradation... Just create a null
> pointer for the function in the pass. The first time you need it, if
> null, getOrInsert. Afterwards, it isn't null. The null test shouldn't
> matter at all.

It occurs to me that of course, this pointer could only be used for
the duration of a single runOnFunction invocation. That might make it
less appealing as an optimization.