[PATCH] D122709: [RISCV] Enable cross basic block aware writevxrm insertion
ShihPo Hung via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Sat Apr 2 09:41:02 PDT 2022
arcbbb added a comment.
In D122709#3419837 <https://reviews.llvm.org/D122709#3419837>, @kito-cheng wrote:
> Hmm, I think that made the dynamic rounding mode become unexpected/random rounding mode, give following example, the behavior `vaddd` in `foo` is unpredictably, `vaddd` in foo will operated with current rounding mode if the bar is inlined, but it will become `rnu` once bar inlined, I really think we should restore that for those static rounding mode stuffs.
>
> foo:
> call bar
> vaddd
>
> bar:
> vaadd.rm rnu
By the way, in this case `vxrm` is unknown on foo() entry, it is unpredictable in the first place.
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https://reviews.llvm.org/D122709/new/
https://reviews.llvm.org/D122709
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