[PATCH] D125657: [RegisterCoalescer] fix dst subreg replacement during remat copy trick

[Matthias Braun via Phabricator via llvm-commits]

MatzeB added a comment.

In D125657#3806193 <https://reviews.llvm.org/D125657#3806193>, @qcolombet wrote:

>> When needing to test regalloc situations I sometimes write tests by creating a .mir file and just adding implicit-def and implicit-use operands on a "NOOP" instructions as necessary to re-create the particular situation.
>
> Agree, although I don't think it will work in that case, since we need to trigger a rematerialization and that rematerialization needs to have operands and unless I'm mistaken the rematerialization won't carrying around the implicit operands.

Ah, yeah I don't know of an easy way to test with rematerialization either.


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https://reviews.llvm.org/D125657