llvm dev - Nov 2018 - LTO and Inlining and Stack Frame Size

Inlining is more aggressive with LTO. This could lead to stack frame sizes
growing. However, sometimes you're working with software that is sensitive
to stack sizes and would like to keep things within a certain limit (say
8K). Is there a way to achieve this with clang's LTO (or indeed its inliner
in general)?

-bw
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This is probably better controlled in the inliner, and there are internal
options there already for controlling various size thresholds. LTO doesn't
directly control inlining directly, it just provides a bigger
scope. +Easwaran who works on the inliner and might be able to point you in
the right direction.

Teresa

On Wed, Nov 28, 2018 at 11:40 AM Bill Wendling via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> Inlining is more aggressive with LTO. This could lead to stack frame sizes
> growing. However, sometimes you're working with software that is
sensitive
> to stack sizes and would like to keep things within a certain limit (say
> 8K). Is there a way to achieve this with clang's LTO (or indeed its
inliner
> in general)?
>
> -bw
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>

-- 
Teresa Johnson |  Software Engineer |  tejohnson at google.com |
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Thanks, Teresa. I'll look at some of those options.

On Wed, Nov 28, 2018 at 5:46 PM Teresa Johnson <tejohnson at google.com>
wrote:
> This is probably better controlled in the inliner, and there are internal
> options there already for controlling various size thresholds. LTO
doesn't
> directly control inlining directly, it just provides a bigger
> scope. +Easwaran who works on the inliner and might be able to point you in
> the right direction.
>
> Teresa
>
> On Wed, Nov 28, 2018 at 11:40 AM Bill Wendling via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> Inlining is more aggressive with LTO. This could lead to stack frame
>> sizes growing. However, sometimes you're working with software that
is
>> sensitive to stack sizes and would like to keep things within a certain
>> limit (say 8K). Is there a way to achieve this with clang's LTO (or
indeed
>> its inliner in general)?
>>
>> -bw
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>
>
>
> --
> Teresa Johnson |  Software Engineer |  tejohnson at google.com |
>
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