[llvm] r271303 - [PM] ADCE: Fix caching of analyses.

[Davide Italiano via llvm-commits]

Author: davide
Date: Tue May 31 12:39:39 2016
New Revision: 271303

URL: http://llvm.org/viewvc/llvm-project?rev=271303&view=rev
Log:
[PM] ADCE: Fix caching of analyses.

When this pass was originally ported, AA wasn't available for the
new PM. Now it is, so we can cache properly.

Modified:
    llvm/trunk/lib/Transforms/Scalar/ADCE.cpp

Modified: llvm/trunk/lib/Transforms/Scalar/ADCE.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/ADCE.cpp?rev=271303&r1=271302&r2=271303&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/ADCE.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/ADCE.cpp Tue May 31 12:39:39 2016
@@ -146,9 +146,14 @@ static bool aggressiveDCE(Function& F) {
 }
 
 PreservedAnalyses ADCEPass::run(Function &F) {
-  if (aggressiveDCE(F))
-    return PreservedAnalyses::none();
-  return PreservedAnalyses::all();
+  if (!aggressiveDCE(F))
+    return PreservedAnalyses::all();
+
+  // FIXME: ADCE should also 'preserve the CFG'.
+  // The new pass manager has currently no way to do it.
+  auto PA = PreservedAnalyses();
+  PA.preserve<GlobalsAA>();
+  return PA;
 }
 
 namespace {