[LLVMdev] mem2reg optimization

[Nicolas Capens]

Hi Dave,

As an exercise I tried to fix this myself, and I think I have a working
patch (attached). My own tests are all working wonderfully, and at fantastic
performance!

I'm looking forward to your patch to see whether we used the same approach
or whether things could be improved further.

Anyway, I've re-profiled the code and found ComputeLiveInBlocks to be the
main hotspot now. Again it uses a linear search over the instructions so
there's a chance this can be optimized as well...

Kind regards,

Nicolas


-----Original Message-----
From: David Greene [mailto:dag at cray.com] 
Sent: Wednesday, 24 September, 2008 18:07
To: Nicolas Capens
Cc: 'LLVM Developers Mailing List'
Subject: Re: [LLVMdev] mem2reg optimization

On Wednesday 24 September 2008 09:35, Nicolas Capens wrote:
> Hi Dave,
>
> Did that patch of yours ever make it into trunk? I can't seem to find any
> related checkin for PromoteMemoryToRegister.cpp. I've been doing some
extra
> profiling lately and the RewriteSingleStoreAlloca function alone is taking
> a whopping 63% of execution time.

I will commit it today along with some other things.  I've been having a lot

of trouble building llvm-gcc but I think I've struggled enouigh now and will
just hope our testing on this end has been enough.

Thanks for the prod.

                                          -Dave
-------------- next part --------------
A non-text attachment was scrubbed...
Name: PromoteMemoryToRegister.patch
Type: application/octet-stream
Size: 2695 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20080925/6cf39542/attachment.obj>