[mpich-discuss] Possible integer overflows at scale in gather.c

[Rob Latham]

On 10/01/2015 12:35 PM, Ignacio Laguna wrote:

> Once you have a version I can download with the patches, I can run the
> analysis again and see if I can catch more things. Just let me know and
> I would be happy to test it.

I tried to decipher the LLVM output: I see a few more i64 values, but 
not certain I'm reading it correctly.

Does this patch do the trick?

Promoting the declaration of recvcount would work too, but sets off a 
larger cascade of  type promotions.

==rob

>
> In general, overflows can also occur in intermediate computations,
> depending on how code is optimized, I believe.
>
> Thanks!
>
> Ignacio
>
>> ==rob
>>
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-- 
Rob Latham
Mathematics and Computer Science Division
Argonne National Lab, IL USA