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Showing content from https://lists.llvm.org/pipermail/llvm-dev/2020-July/143577.html below:

[llvm-dev] Allowed operations for passes that report "no change"

[llvm-dev] Allowed operations for passes that report "no change" [llvm-dev] Allowed operations for passes that report "no change"Jay Foad via llvm-dev llvm-dev at lists.llvm.org
Tue Jul 21 04:12:30 PDT 2020
On Mon, 20 Jul 2020 at 08:21, Serge Guelton via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
> > I agree. If a pass modifies the IR in any way, even temporarily, it was changed (at some point).
>  I'd like to +1, but when doing the migration of the code base to enable the associated expensive check, I found situations where (B) was used.

For example CodeGenPrepare has a TypePromotionTransaction class which
is specifically designed to let you modify the IR, then roll back
those modifications and return false.

Jay.
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