[PATCH] D155071: [RISCV] Fold vmerge into its ops with smaller VL if known

[Craig Topper via Phabricator via llvm-commits]

craig.topper added a comment.

I think I'm seeing a miscompile from this

I have a tail undefined unmasked vrgather.vi with VL=2 followed by a tail undefined vmerge with VL=4. This gets combined to a tail agnostic masked undisturbed masked vrgather.vi with VL =2. I think this needs to be a tail undisturbed VL to account for elements 2 and 3 from the vmerge becoming part of the tail?


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https://reviews.llvm.org/D155071