[LLVMdev] enable globalsmodref-aa by default

[Xin Tong]

so what are my options at the moment ? should i insert
PM.add(createGlobalsModRefPass()); before  transformations i know
globalmodref-aa might improve ?
Thanks
-Xin

On Mon, Jul 13, 2015 at 10:29 AM, Chandler Carruth <chandlerc at google.com>
wrote:

> Hah. No. =/
>
> So, globalsmodref-aa is *very very broken*. I'm working on emails to
> explain this, but I *really* don't want this to be enabled in the primary
> pass pipeline in its current form, if ever. It currently relies on bugs in
> the pass manager to even begin to work, and is wrong in many cases as a
> consequence.
>
> On Mon, Jul 13, 2015 at 10:27 AM Xin Tong <trent.xin.tong at gmail.com>
> wrote:
>
>> Hello
>>
>>
>> I am trying to enable globalsmodref-aa by default. globalmodref-aa is a
>> ModulePass and therefore can be invalidated and need to be rerun.
>>
>>
>> I see globalsmodref-aa is enabled in LTO passmanager by adding the
>> analysis pass explicitly. I wonder whether globalsmodref-aa can be
>> enabled/run based on pass dependencies, i.e. those indicated in
>> getAnalysisUsage().
>>
>> Thanks,
>> Xin
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