[PATCH] D136040: [X86] Support PREFETCHI instructions

[Ulrich Weigand via Phabricator via cfe-commits]

uweigand added a comment.

In D136040#3862386 <https://reviews.llvm.org/D136040#3862386>, @pengfei wrote:

> Sure, it is possible. But at least for now, there's no real target requires it. Checked with `grep -rwn 'llvm.prefetch.*i32 0\s*)' llvm/test/CodeGen/`.

But that's just within the LLVM sources.  My point was that -up to now- this was part of the public LLVM IR spec, so there could by other LLVM users out there creating this IR, which would now suddenly break.  Not sure what the rules are for breaking IR changes, but that would presumably need some wider discussion.


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https://reviews.llvm.org/D136040