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2019 Feb 22
2
How to get Greedy RA to not spill results of trivially rematerializable instructions
...lue
> Else
> R3 = cst
> = R3
>
> When we spill R3, we don’t know if we are going to get the if or else part
> of R3. Furthermore, if R3 was a constant on both paths, we would need to
> emit a select-like instruction to pick the right value, which is definitely
> not simple remarterialization.
>
> Let me know if I miss something, otherwise I feel there isn’t much we need
> to do here.
>
> Cheers,
> -Quentin
>
> On Feb 20, 2019, at 9:19 PM, Quentin Colombet via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
> Thanks for the reduced test...
2019 Feb 21
2
How to get Greedy RA to not spill results of trivially rematerializable instructions
Thanks for the reduced test case, I’ll try to take a look by the end of the week.
> On Feb 20, 2019, at 6:53 PM, Nemanja Ivanovic <nemanja.i.ibm at gmail.com> wrote:
>
> Finally managed to reduce this to something manageable: https://godbolt.org/z/Hw529k <https://godbolt.org/z/Hw529k>
>
> On line 40 of the output, we have a load-immediate to put zero into R3. Then we