[LLVMdev] proposal to avoid zlib dependency.

[Alex Rosenberg]

On Sep 23, 2014, at 7:42 AM, Jim Grosbach <grosbach at apple.com> wrote:
> 
> 
>> On Sep 23, 2014, at 1:29 AM, Chandler Carruth <chandlerc at google.com> wrote:
>> 
>> 
>>> On Mon, Sep 22, 2014 at 9:38 PM, Alex Rosenberg <alexr at leftfield.org> wrote:
>>> Is your answer the same if we're talking about an asm version of zlib that's faster than the compiled version? Because that's a thing.
>> 
>> If zlib is our bottleneck... wow we have bigger issues.
>> 
>> And as we work on a compiler, I kinda hope we can produce a reasonable blob of asm in most cases. If not, we should probably get on that.
> 
> Dang it. Beaten to the punch. I was just going to ask for a bug report that we apparently generate suboptimal code for that. :)
> 
> Taking my trolling hat back off, I actually am interested in whether it’s reasonable for the compiler to do significantly better here (and on other similar kinds of code). Alex, can you elaborate a bit?

Zlib has been written in asm a few times over, just check the distribution.

I haven't looked too closely at the code, but from my recollection of someone in my team writing a SPU version, it's pretty much a set of transforms that if a compiler could do them would be considered "heroic optimizations" and likely not the sort of thing we'd put in LLVM.

Alex
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