[LLVMdev] Pool Allocation and DSA (and: Re: DSA Question)

Patrick Alexander Simmons simmon12 at cs.uiuc.edu
Fri Jun 19 09:23:12 PDT 2009

Torvald Riegel wrote:
> On Thursday 11 June 2009 18:14:08 John Criswell wrote:
>> If your use of pool allocation requires that you can always get the pool
>> handle for a pointer, you need to make sure that pool allocation is
>> configured so that it doesn't generate the above scenario.  I think
>> there is an option to make all pools be global pools.
> Some time ago, I used AnalysisUsage's addRequired<PoolAllocatePassAllPools>()  
> to get this behavior. It didn't make all pools global.
> Torvald
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Okay, thanks, Torvald.  I assume this resulted in more pool descriptor 
arguments being passed; did you find this to hurt performance at all?

Once I have the local pool descriptor, it's occurred to me that what I 
basically need is the interprocedural use-def chain from a pool 
descriptor's Argument to the corresponding Values in the caller 
functions.  Unfortunately, I looked in the class hierarchy and found 
that Argument is not a subclass of User.  Still, perhaps someone has 
created an interprocedural def-use/use-def analysis pass for LLVM for 
some other purpose?


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