[PATCH] D126745: [RISCV][Clang] Support policy functions for vmerge, vfmerge and vcompress.

Mon Aug 1 11:16:10 PDT 2022

craig.topper added a comment.

In D126745#3691528 <https://reviews.llvm.org/D126745#3691528>, @khchen wrote:

> In D126745#3678776 <https://reviews.llvm.org/D126745#3678776>, @nlopes wrote:
>
>> While at it, could you switch those UndefValue with PoisonValue if possible?  Thank you!
>
> I'm not sure UndefValue will work because the backend would only check isUndef() to generate correct code...

PoisonValue and UndefValue are both turned into undef in SelectionDAG today.

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https://reviews.llvm.org/D126745