DEFAULT_CALLER_SAVES doesn't work on the mac

[Muhammed Fawzy]

OH, I see, thanks for pointing this out, I really appreciate your help.:)

--------------------------------------------------
From: "Ian Lance Taylor" <iant@google.com>
Sent: Tuesday, December 22, 2009 3:09 PM
To: "Muhammed Fawzy" <mfawzymkh@hotmail.com>
Cc: <gcc-help@gcc.gnu.org>
Subject: Re: DEFAULT_CALLER_SAVES doesn't work on the mac

> "Muhammed Fawzy" <mfawzymkh@hotmail.com> writes:
> 
>> FUNCTION_PROFILER means I am going to write my own profiler and not
>> rely on gprof /( mcount ),  unfortunately, the we need to use gprof
>> output because It would be used later for link time code optimization
>> step, so we are bound with -pg switch and mcount.
>> It looks like the only way to solve this problem is to fix gcc, is
>> this correct?
> 
> Yes, I think so.
> 
> I mentioned FUNCTION_PROFILER because that is the internal macro in
> gcc which you need to change.  Look for FUNCTION_PROFILER in
> gcc/config/i386/i386.h.
> 
> Ian
> 
>> --------------------------------------------------
>> From: "Ian Lance Taylor" <iant@google.com>
>> Sent: Tuesday, December 22, 2009 2:59 PM
>> To: "Muhammed Fawzy" <mfawzymkh@hotmail.com>
>> Cc: <gcc-help@gcc.gnu.org>
>> Subject: Re: DEFAULT_CALLER_SAVES doesn't work on the mac
>>
>>> "Muhammed Fawzy" <mfawzymkh@hotmail.com> writes:
>>>
>>>> I see,  so even writing a plugin to alter the instruction stream
>>>> wouldn't help?
>>>
>>> In this case, probably not.  The call to mcount is generated very
>>> late.
>>>
>>>> is it possible to have a flag for gcc to store registers around mcount
>>>> calls - through a patch or something, right now apple implementation
>>>> for mcount doesn't store registers - except for ebx, esi , and edi,
>>>> which technically render the -pg switch broken when profiling fast
>>>> call functions, where arguments are passed in ecx and edx
>>>> any help regarding this issue is REALLY appreciated.
>>>
>>> Sure, that is possible.
>>>
>>> Look for FUNCTION_PROFILER in the relevant backend.
>>>
>>> Ian
>>>
>