arsenm wrote:

> Then I think the poison-propagating rules for this intrinsic should be 
> documented. They're not obvious and "it just does what the underlying 
> instruction does" is no longer sufficient.

We're currently not propagating poison for these intrinsics, and this patch 
isn't changing any behavior. This is changing an implementation detail of the 
discard input that is already done 

https://github.com/llvm/llvm-project/pull/131288
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