[PATCH] D72492: GlobalISel: Implement lower for G_BITCAST

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added a comment.

In D72492#1814575 <https://reviews.llvm.org/D72492#1814575>, @arsenm wrote:

> In D72492#1814528 <https://reviews.llvm.org/D72492#1814528>, @aemerson wrote:
>
> > On AArch64 we also use bitcast to convert from <n x p0> to <n x s64> types.
>
>
> I thought that was illegal. It’s not legal in IR


I think this is a verifier bug. You're not allowed to bitcast between scalar pointers and scalars, so allowing it for vectors doesn't make much sense.  I think allowing this is potentially problematic for non-integral pointers since it makes it easy to accidentally launder away the pointerness


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