[PATCH] D93818: [LangRef] Update shufflevector's semantics to return poison if the mask is undef

[Juneyoung Lee via Phabricator via llvm-commits]

aqjune added inline comments.


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Comment at: llvm/docs/LangRef.rst:9453
 literals for a vector with a length unknown at compile time.
 
 Example:
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jdoerfert wrote:
> Don't we need  to talk about both poison and undef now? Sufflemask, for example, can still be undef, no?
Combined with D103874, a mask value is constrained to either a constant integer or poison value.
This is to avoid confusion - an undef mask and a poison mask have no difference. 


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  https://reviews.llvm.org/D93818/new/

https://reviews.llvm.org/D93818