[PATCH] D145051: [ADCE] Only remove debug intrinsics if non debug instructions are removed

[Nikita Popov via Phabricator via llvm-commits]

nikic added a comment.

This caused a large compile-time regressions in some cases: http://llvm-compile-time-tracker.com/compare.php?from=57833636816a13ccda53714413c532dc81e3b5ff&to=8aa9ab336889ae2eb8e4188036faeb151379ab7b&stat=instructions:u In particular tramp3d-v4 with debuginfo regressed by 15%.

So I think this is probably not the right way to fix this issue. I think what we can do instead is to mark MemorySSA as preserved if only debuginfo intrinsics have been removed. (This is safe, MSSA explicitly never tracks debuginfo intrinsics.)


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  https://reviews.llvm.org/D145051/new/

https://reviews.llvm.org/D145051