[PATCH] D86025: [CodeGen] Respect libfunc availability when lowering intrinsic memcpy

[Martin Storsjö via Phabricator via llvm-commits]

mstorsjo added a comment.

In D86025#2220435 <https://reviews.llvm.org/D86025#2220435>, @aemerson wrote:

> If we can’t lower it into a libcall, what *can* we do with it beyond optimizing into an unrolled in-line sequence? Just generate a whole memcpy implementation inline?

I guess those are the options, yeah.

For the case I'm looking at, code with an explicit struct assignment without the code calling memcpy or anything equivalent, and building it with -fno-builtin, I think the expectation is to just expand it into an inline memcpy, however long that sequence might be.


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