Re: [gimplefe] hacking pass manager

[Prasad Ghangal <prasad dot ghangal at gmail dot com>]

On 30 June 2016 at 17:10, Richard Biener <richard.guenther@gmail.com> wrote:
> On Wed, Jun 29, 2016 at 9:13 PM, Prasad Ghangal
> <prasad.ghangal@gmail.com> wrote:
>> On 29 June 2016 at 22:15, Richard Biener <richard.guenther@gmail.com> wrote:
>>> On June 29, 2016 6:20:29 PM GMT+02:00, Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org> wrote:
>>>>On 18 June 2016 at 12:02, Prasad Ghangal <prasad.ghangal@gmail.com>
>>>>wrote:
>>>>> Hi,
>>>>>
>>>>> I tried hacking pass manager to execute only given passes. For this I
>>>>> am adding new member as opt_pass *custom_pass_list to the function
>>>>> structure to store passes need to execute and providing the
>>>>> custom_pass_list to execute_pass_list() function instead of all
>>>>passes
>>>>>
>>>>> for test case like-
>>>>>
>>>>> int a;
>>>>> void __GIMPLE (execute ("tree-ccp1", "tree-fre1")) foo()
>>>>> {
>>>>> bb_1:
>>>>>   a = 1 + a;
>>>>> }
>>>>>
>>>>> it will execute only given passes i.e. ccp1 and fre1 pass on the
>>>>function
>>>>>
>>>>> and for test case like -
>>>>>
>>>>> int a;
>>>>> void __GIMPLE (startwith ("tree-ccp1")) foo()
>>>>> {
>>>>> bb_1:
>>>>>   a = 1 + a;
>>>>> }
>>>>>
>>>>> it will act as a entry point to the pipeline and will execute passes
>>>>> starting from given pass.
>>>>Bike-shedding:
>>>>Would it make sense to have syntax for defining pass ranges to execute
>>>>?
>>>>for instance:
>>>>void __GIMPLE(execute (pass_start : pass_end))
>>>>which would execute all the passes within range [pass_start, pass_end],
>>>>which would be convenient if the range is large.
>>>
>>> But it would rely on a particular pass pipeline, f.e. pass-start appearing before pass-end.
>>>
>>> Currently control doesn't work 100% as it only replaces all_optimizations but not lowering passes or early opts, nor IPA opts.
>>>
>>
>> Each pass needs GIMPLE in some specific form. So I am letting lowering
>> and early opt passes to execute. I think we have to execute some
>> passes (like cfg) anyway to represent GIMPLE into proper form
>
> Yes, that's true.  Note that early opt passes only optimize but we need
> pass_build_ssa_passes at least (for into-SSA).  For proper unit-testing
> of GIMPLE passes we do need to guard off early opts somehow
> (I guess a simple if (flag_gimple && cfun->custom_pass_list) would do
> that).
>
> Then there is of course the question about IPA passes which I think is
> somewhat harder (one could always disable all IPA passes manually
> via flags of course or finally have a global -fipa/no-ipa like most
> other compilers).
>
Can we iterate through all ipa passes and do -fdisable-ipa-pass or
-fenable-ipa-pass equivalent for each?

Thanks,
Prasad

> Richard.
>
>>> Richard.
>>>
>>>>Thanks,
>>>>Prathamesh
>>>>>
>>>>>
>>>>>
>>>>> Thanks,
>>>>> Prasad Ghangal
>>>
>>>