[LLVMdev] Unused malloc/free don't get optimized

[Nick Lewycky]

Vikram S. Adve wrote:
> On Feb 22, 2007, at 1:54 PM, Nick Lewycky wrote:
> 
>>I think you could use "getModRefInfo(CallSite, Value *, unsigned)".
> 
> I may be missing your point, but that doesn't tell you if an object  
> allocated *within* a function escapes the function.

No, I missed your point. I thought you could look at the allocations
within a function then use that method on all calls involving that
alloca as an argument, but that doesn't do what I wanted.

I have some hope for getModRefBehavior which returns a container of
PointerAccessInfo, but I haven't yet decided if that actually does what
I mean either.

Worst case, the optz'n just falls back to degraded behaviour without DSA.

Nick Lewycky