loops problem

[Ian Lance Taylor]

Abdul Wahid Memon <engrwahidmemon@gmail.com> writes:

> Thanks alot. Its working well at GIMPLE but for RTL, it is again
> posing a problem of internal compiler error.

loop_optimizer_init does work for RTL passes, so you are going to have
to debug what is going wrong.

Ian

> On Thu, May 19, 2011 at 2:28 AM, Ian Lance Taylor <iant@google.com> wrote:
>> Abdul Wahid Memon <engrwahidmemon@gmail.com> writes:
>>
>>> I am facing some problem at obtaining the number of loops in the source program.
>>> I am trying to use a function number_of_loops defined in cfgloop.h
>>> with the help of plugin.
>>>
>>> I have tried to capture this at both GIMPLE level after copy headers
>>> pass where I always get the value of 0,
>>> because the condition  if (!current_loops)    return 0; is (I think)
>>> always becoming true and the same thing happens
>>> at RTL after 'loop2_init' pass but I get the value of 1 even in the
>>> presence or in the absence of any loop.
>>>
>>> This is the first time I am playing with GCC plugins. Please help me
>>> out with this issue.
>>>
>>> PS: The passes after which I am puting my passes are definitely
>>> producing the information about the loops as
>>> can be seen from the dumps produced by copy headers pass and loop
>>> initialization.
>>
>> If you want to call number_of_loops you need to call loop_optimizer_init
>> at the start of your pass and loop_optimizer_finalize at the end of it.
>>
>> Ian
>>