[llvm-dev] On Multi-Exit Loop Vectorizer

[Philip Reames via llvm-dev]

Progress has been slow.  At the moment, I'm still working on getting 
support for loops with multiple exits where all exits are analyzeable.  
(The example below includes a data dependent exit, that's a harder 
sub-problem.)

Currently, the progress on analyzeable exits is blocked on 
https://reviews.llvm.org/D103700.

Philip

On 6/13/21 7:49 PM, raghesh via llvm-dev wrote:
> Hi All,
>
> RFC in [1] proposed to perform loop vectorization in presence of 
> multiple exits. I could find some patches [2, 3] essential for this 
> that got upstreamed.
>
> Is the implementation ready to be used now? If not, will this be 
> landed in the near future?
>
> When I tried with simple examples like the one below, vectorization 
> was not happening.
>
> int foo(float *a, int n){
>   int i;
>   for (i=0;i<n;i++){
>     if (a[i] == 0){
>       break;
>     }
>   }
>   return i;
> }
>
> [1] 
> https://lists.llvm.org/pipermail/llvm-dev/2019-September/134998.html 
> <https://lists.llvm.org/pipermail/llvm-dev/2019-September/134998.html>
> [2] https://reviews.llvm.org/D66688 <https://reviews.llvm.org/D66688>
> [3] https://reviews.llvm.org/D93317 <https://reviews.llvm.org/D93317>
>
> Thanks and Regards,
> ------------------------------
> Raghesh Aloor
> AMD India Pvt. Ltd.
> Bengaluru.
> ------------------------------
>
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