[llvm] c5245dd - [LoopFlatten] Mark loop analyses as preserved

[Nikita Popov via llvm-commits]

Author: Nikita Popov
Date: 2021-10-07T21:56:49+02:00
New Revision: c5245dd33904bd1b69a2a49d17b1bea156e8dabf

URL: https://github.com/llvm/llvm-project/commit/c5245dd33904bd1b69a2a49d17b1bea156e8dabf
DIFF: https://github.com/llvm/llvm-project/commit/c5245dd33904bd1b69a2a49d17b1bea156e8dabf.diff

LOG: [LoopFlatten] Mark loop analyses as preserved

LoopFlatten does preserve loop analyses (DT, LI and SCEV), but
currently doesn't mark them as preserved in the NewPM (they are
marked as preserved in the LegacyPM). I think this doesn't really
have an effect in the end because the loop pass adaptor will just
assume they're preserved anyway, but let's be explicit about this
for the sake of clarity.

Differential Revision: https://reviews.llvm.org/D111328

Added: 
    

Modified: 
    llvm/lib/Transforms/Scalar/LoopFlatten.cpp

Removed: 
    


################################################################################
diff  --git a/llvm/lib/Transforms/Scalar/LoopFlatten.cpp b/llvm/lib/Transforms/Scalar/LoopFlatten.cpp
index 9440de21b81b5..aa286d690b7f7 100644
--- a/llvm/lib/Transforms/Scalar/LoopFlatten.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopFlatten.cpp
@@ -815,7 +815,7 @@ PreservedAnalyses LoopFlattenPass::run(LoopNest &LN, LoopAnalysisManager &LAM,
   if (!Changed)
     return PreservedAnalyses::all();
 
-  return PreservedAnalyses::none();
+  return getLoopPassPreservedAnalyses();
 }
 
 namespace {