llvm dev - Aug 2012 - [LLVMdev] Compressing with llvm-ar

On Thu, Aug 9, 2012 at 12:49 PM, Rafael Espíndola
<rafael.espindola at gmail.com> wrote:
>> I think this is a leftover from the days we used to have a *byte*code
>> and use bzip2 on it :-)
>>
>> I will try to clean it up.
>
> The attached patch removes all references to compression from llvm-ar,
> llvm-ranlib and related libraries.
>
> Is it OK?
>
> Cheers,
> Rafael
LGTM.

And I had forgotten that llvm-ar still uses exceptions...

- Michael Spencer

On Thu, Aug 9, 2012 at 1:15 PM, Michael Spencer <bigcheesegs at gmail.com>
wrote:
> On Thu, Aug 9, 2012 at 12:49 PM, Rafael Espíndola
> <rafael.espindola at gmail.com> wrote:
>>> I think this is a leftover from the days we used to have a
*byte*code
>>> and use bzip2 on it :-)
>>>
>>> I will try to clean it up.
>>
>> The attached patch removes all references to compression from llvm-ar,
>> llvm-ranlib and related libraries.
>>
>> Is it OK?
>>
>> Cheers,
>> Rafael
>
> LGTM.
>
> And I had forgotten that llvm-ar still uses exceptions...
>
> - Michael Spencer
Oops, forgot. This patch needs to also update the documentation.

- Michael Spencer

It's too bad that the compression feature was dropped. Can you share why?

I was interested in using llvm-ar to compress LLVM outputs. My experiments show
that BC and PCH files are highly compressible (~35% of original size).  I can
see many situations that would benefit from a reduced storage size. I have tried
other methods for reducing the file size such as tweaking with opt options (see
attached thread) but didn't get much space savings. I really liked the idea
of an LLVM tool to do the compression but I guess I'll have to look
elsewhere.

Thanks,
Javier

-----Original Message-----
From: Michael Spencer [mailto:bigcheesegs at gmail.com] 
Sent: Thursday, August 09, 2012 1:17 PM
To: Rafael Espíndola
Cc: Martinez, Javier E; llvmdev at cs.uiuc.edu
Subject: Re: [LLVMdev] Compressing with llvm-ar

On Thu, Aug 9, 2012 at 1:15 PM, Michael Spencer <bigcheesegs at gmail.com>
wrote:
> On Thu, Aug 9, 2012 at 12:49 PM, Rafael Espíndola 
> <rafael.espindola at gmail.com> wrote:
>>> I think this is a leftover from the days we used to have a 
>>> *byte*code and use bzip2 on it :-)
>>>
>>> I will try to clean it up.
>>
>> The attached patch removes all references to compression from 
>> llvm-ar, llvm-ranlib and related libraries.
>>
>> Is it OK?
>>
>> Cheers,
>> Rafael
>
> LGTM.
>
> And I had forgotten that llvm-ar still uses exceptions...
>
> - Michael Spencer
Oops, forgot. This patch needs to also update the documentation.

- Michael Spencer
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