llvm dev - Sep 2020 - Code size BoF @ Developers' Meeting

Hi all,

For those of you attending the upcoming Developers' Meeting, I'll be
running a Birds-of-a-Feather about code size optimization. It'll be on Oct.
6 at 9:30am PDT, immediately after Aditya Kumar's tech talk on the same
subject.

There are several topics I think we could potentially discuss:
(1) Situations where people have needed to optimize code size.
(2) Situations where other compilers currently optimize code size better than
LLVM.
(3) A survey of academic and experimental techniques for reducing code size,
including our own, ranging from outlining to program specialization.
(4) Which techniques and improvements would be most beneficial to add to LLVM?

But that's a lot to cover, and I want to make sure we spend our time on the
areas people are most interested in. What would you most like to have a
discussion about?

Sean

> -----Original Message-----
> From: llvm-dev <llvm-dev-bounces at lists.llvm.org> On Behalf Of Sean
Bartell
> via llvm-dev
> Sent: Sunday, September 27, 2020 2:14 PM
> To: llvm-dev <llvm-dev at lists.llvm.org>
> Cc: aditya kumar <hiraditya at gmail.com>; Vikram Adve <vadve at
illinois.edu>
> Subject: [llvm-dev] Code size BoF @ Developers' Meeting
> 
> Hi all,
> 
> For those of you attending the upcoming Developers' Meeting, I'll
be
> running a Birds-of-a-Feather about code size optimization. It'll be on
> Oct. 6 at 9:30am PDT, immediately after Aditya Kumar's tech talk on the
> same subject.
> 
> There are several topics I think we could potentially discuss:
> (1) Situations where people have needed to optimize code size.
There's been some interest lately in doing less optimization on cold code;
see for example https://reviews.llvm.org/D87337 which slaps 'optnone' on
cold functions.  But it might be better to optimize cold code for size.
That's maybe not so easy with LLVM's one-pipeline-for-all design.
--paulr
> (2) Situations where other compilers currently optimize code size better
> than LLVM.
> (3) A survey of academic and experimental techniques for reducing code
> size, including our own, ranging from outlining to program specialization.
> (4) Which techniques and improvements would be most beneficial to add to
> LLVM?
> 
> But that's a lot to cover, and I want to make sure we spend our time on
> the areas people are most interested in. What would you most like to have
> a discussion about?
> 
> Sean
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