[llvm-dev] Regression in SPEC2006/gcc caused by LoopLoadElimination

[Adam Nemet via llvm-dev]

Thanks!

> On Mar 10, 2016, at 8:33 AM, Eric Christopher <echristo at gmail.com> wrote:
> 
> I'll try to get this tested today.
> 
> 
>> On Thu, Mar 10, 2016, 8:29 AM Adam Nemet <anemet at apple.com> wrote:
>> Great, thanks very much, Haicheng!
>> 
>>> On Mar 10, 2016, at 8:08 AM, Haicheng Wu <haicheng at codeaurora.org> wrote:
>>> 
>>> Thank you, Adam.
>>> 
>>>  
>>> 
>>> It passes all the benchmarks I have.
>>> 
>>>  
>>> 
>>> Haicheng
>>> 
>>>  
>>> 
>>> From: anemet at apple.com [mailto:anemet at apple.com] 
>>> Sent: Wednesday, March 09, 2016 7:17 PM
>>> To: Haicheng Wu; Eric Christopher; Benjamin Kramer
>>> Cc: llvm-dev
>>> Subject: Re: Regression in SPEC2006/gcc caused by LoopLoadElimination
>>> 
>>>  
>>> 
>>> I’ve committed the fix in r263058.  Haicheng, Eric/Benjamin, can you guys please give it a test with your codebase.  (You need to enable the pass with -mllvm -enable-loop-load-elim.)
>>> 
>>>  
>>> 
>>> Thanks!
>>> 
>>> Adam
>>> 
>>>  
>>> 
>>> On Mar 7, 2016, at 11:05 PM, Adam Nemet <anemet at apple.com> wrote:
>>> 
>>>  
>>> 
>>>  
>>> 
>>> On Mar 7, 2016, at 9:43 AM, Adam Nemet <anemet at apple.com> wrote:
>>> 
>>>  
>>> 
>>> Hi Haicheng,
>>> 
>>>  
>>> 
>>> Sorry about the breakage.  I reverted it in r262839.
>>> 
>>>  
>>> 
>>> I will try to reproduce it locally.  Please don’t blow away your directories yet in case I need further help.
>>> 
>>>  
>>> 
>>> OK, I managed to reproduce this locally.  Should be able to make progress from here without further help from you.
>>> 
>>>  
>>> 
>>> Adam
>>> 
>>> 
>>> 
>>> 
>>> Thanks,
>>> 
>>> Adam
>>> 
>>>  
>>> 
>>> On Mar 7, 2016, at 8:33 AM, Haicheng Wu <haicheng at codeaurora.org> wrote:
>>> 
>>>  
>>> 
>>> Hi Adam,
>>> 
>>>  
>>> 
>>> I find LoopLoadElimination (r262250) causes SPEC2006/gcc generate wrong result (166.s) in AArch64 when running with *ref* data set.  The error happens when I use either “-Ofast -flto -fuse-ld=gold” or “-O3 -fno-strict-aliasing”.  Please let me know if you need more information.
>>> 
>>>  
>>> 
>>> Best,
>>> 
>>>  
>>> 
>>> Haicheng
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