[llvm-commits] patch: teach deadargelim to work on externally visible functions!

[Chris Lattner]

On Jan 4, 2010, at 5:18 AM, Török Edwin wrote:

>>> It returns false for externalLinkage, yet you can override the symbol
>>> from another shared lib.
>> 
>> sure, but then you are invoking undefined behaviour.
> 
> If the optimizer already assumes that externalLinkage means no override
> (which is a perfectly reasonable thing to do),

Yes it does.

> then why not do further optimizations based on this assumption, and
> really call the function we see
> (instead of going through the .plt and calling whatever that resolves to
> at runtime).

Can you elaborate?

-Chris