AlignmentFromAssumptions and SLPVectorizer preserves AA and GlobalsAA

GlobalsAA's assumptions that passes do not escape globals not previously
escaped is not violated by AlignmentFromAssumptions and SLPVectorizer. Marking
them as such allows GlobalsAA to be preserved until GVN in the LTO pipeline.

http://lists.llvm.org/pipermail/llvm-dev/2015-December/092972.html

Patch by Vaivaswatha Nagaraj!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255348 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/Scalar/AlignmentFromAssumptions.cpp b/lib/Transforms/Scalar/AlignmentFromAssumptions.cpp
index a13e552cbd01a8a98cdddc1e191e268fa9ae8d09..79cd1c0eaaa3af477fb74a4ff38b14004dabb761 100644 (file)
--- a/lib/Transforms/Scalar/AlignmentFromAssumptions.cpp
+++ b/lib/Transforms/Scalar/AlignmentFromAssumptions.cpp
@@ -21,6 +21,8 @@
 #include "llvm/Transforms/Scalar.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/Statistic.h"
+#include "llvm/Analysis/AliasAnalysis.h"
+#include "llvm/Analysis/GlobalsModRef.h"
 #include "llvm/Analysis/AssumptionCache.h"
 #include "llvm/Analysis/LoopInfo.h"
 #include "llvm/Analysis/ScalarEvolution.h"
@@ -58,6 +60,8 @@ struct AlignmentFromAssumptions : public FunctionPass {
     AU.addRequired<DominatorTreeWrapperPass>();
 
     AU.setPreservesCFG();
+    AU.addPreserved<AAResultsWrapperPass>();
+    AU.addPreserved<GlobalsAAWrapperPass>();
     AU.addPreserved<LoopInfoWrapperPass>();
     AU.addPreserved<DominatorTreeWrapperPass>();
     AU.addPreserved<ScalarEvolutionWrapperPass>();

diff --git a/lib/Transforms/Vectorize/SLPVectorizer.cpp b/lib/Transforms/Vectorize/SLPVectorizer.cpp
index ad28a72deee3239adfb7d9cfbebb4a340d66025f..dead6e181c436c8eacc5ca268c67e65b51921c3d 100644 (file)
--- a/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -22,6 +22,7 @@
 #include "llvm/ADT/SetVector.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/Analysis/AliasAnalysis.h"
+#include "llvm/Analysis/GlobalsModRef.h"
 #include "llvm/Analysis/AssumptionCache.h"
 #include "llvm/Analysis/CodeMetrics.h"
 #include "llvm/Analysis/LoopInfo.h"
@@ -3235,6 +3236,8 @@ struct SLPVectorizer : public FunctionPass {
     AU.addRequired<DominatorTreeWrapperPass>();
     AU.addPreserved<LoopInfoWrapperPass>();
     AU.addPreserved<DominatorTreeWrapperPass>();
+    AU.addPreserved<AAResultsWrapperPass>();
+    AU.addPreserved<GlobalsAAWrapperPass>();
     AU.setPreservesCFG();
   }