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Subject: Re: A working GIMPLE simple IPA case to run?
To: Shuai Wang <wangshuai901@gmail.com>
Cc: GCC Development <gcc@gcc.gnu.org>
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From: =?UTF-8?Q?Martin_Li=c5=a1ka?= <mliska@suse.cz>
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On 2/20/21 9:15 AM, Shuai Wang wrote:
> Thank you very much! Just a follow-up question regarding IPA.
> 
> Currently I can follow the tree-profile.c sample to perform IPA. However, my analysis is limited to all functions within one .c file. Is it possible for me to do cross- .c file analysis? That is, suppose there is a function foo in source1.c called function bar in source2.c. How can I cross analyze foo then bar?

Hello.

Then you will need a write a proper IPA pass:
https://gcc.gnu.org/onlinedocs/gccint/IPA.html#IPA

or for testing purpose you can use -flto -flto-partition=one

Martin

> 
> Thank you!
> 
> Best,
> Shuai
> 
> 
> 
> On Wed, Feb 17, 2021 at 4:04 PM Martin Liška <mliska@suse.cz <mailto:mliska@suse.cz>> wrote:
> 
>     On 2/17/21 5:21 AM, Shuai Wang via Gcc wrote:
>      > Could anyone shed some light on this? Thank you very much!
> 
>     Hello.
> 
>     I would recommend looking at any of the existing passes:
>     $ git grep SIMPLE_IPA_PASS
>     ...
> 
>     One reasonable example can be gcc/tree-profile.c.
> 
>     Cheers,
>     Martin
>