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db20f1e2c5
Instead, represent the mask as out-of-line data in the instruction. This should be more efficient in the places that currently use getShuffleVector(), and paves the way for further changes to add new shuffles for scalable vectors. This doesn't change the syntax in textual IR. And I don't currently plan to change the bitcode encoding in this patch, although we'll probably need to do something once we extend shufflevector for scalable types. I expect that once this is finished, we can then replace the raw "mask" with something more appropriate for scalable vectors. Not sure exactly what this looks like at the moment, but there are a few different ways we could handle it. Maybe we could try to describe specific shuffles. Or maybe we could define it in terms of a function to convert a fixed-length array into an appropriate scalable vector, using a "step", or something like that. Differential Revision: https://reviews.llvm.org/D72467 |
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