llvm dev - Mar 2016 - Regression in SPEC2006/gcc caused by LoopLoadElimination

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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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.

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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> 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
<mailto: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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