[PATCH] D143897: [CodeGenPrepare] Estimate liveness of loop invariants when checking for address folding profitability

[Jordan Rupprecht via Phabricator via llvm-commits]

rupprecht added a comment.

In D143897#4301532 <https://reviews.llvm.org/D143897#4301532>, @chapuni wrote:

> This discovers unstable behavior.
> For me, MCA/ResourceManaget.o sometimes differs.
> Reproduced by stage1 clang.

Same here, I also bisected to this commit. I found it separately via CodeGen/PrologEpilogInserter.o which differs ~10-20% of the time. The minimal set of flags to reproduce it with (for me at least) is `-O3 -fno-exceptions`.


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https://reviews.llvm.org/D143897