[MemorySSA] Re-enable MemorySSA use.
Differential Revision: https://reviews.llvm.org/D58311
llvm-svn: 370957
diff --git a/llvm/lib/Analysis/MemorySSA.cpp b/llvm/lib/Analysis/MemorySSA.cpp
index ae1e4b8..442d0b4 100644
--- a/llvm/lib/Analysis/MemorySSA.cpp
+++ b/llvm/lib/Analysis/MemorySSA.cpp
@@ -84,7 +84,7 @@
#endif
/// Enables memory ssa as a dependency for loop passes in legacy pass manager.
cl::opt<bool> llvm::EnableMSSALoopDependency(
- "enable-mssa-loop-dependency", cl::Hidden, cl::init(false),
+ "enable-mssa-loop-dependency", cl::Hidden, cl::init(true),
cl::desc("Enable MemorySSA dependency for loop pass manager"));
static cl::opt<bool, true>
diff --git a/llvm/lib/Transforms/Utils/LoopUtils.cpp b/llvm/lib/Transforms/Utils/LoopUtils.cpp
index 4c6c2ed..b4d7f35 100644
--- a/llvm/lib/Transforms/Utils/LoopUtils.cpp
+++ b/llvm/lib/Transforms/Utils/LoopUtils.cpp
@@ -19,6 +19,7 @@
#include "llvm/Analysis/InstructionSimplify.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/LoopPass.h"
+#include "llvm/Analysis/MemorySSA.h"
#include "llvm/Analysis/MemorySSAUpdater.h"
#include "llvm/Analysis/MustExecute.h"
#include "llvm/Analysis/ScalarEvolution.h"
@@ -170,6 +171,8 @@
AU.addPreserved<SCEVAAWrapperPass>();
AU.addRequired<ScalarEvolutionWrapperPass>();
AU.addPreserved<ScalarEvolutionWrapperPass>();
+ // FIXME: When all loop passes preserve MemorySSA, it can be required and
+ // preserved here instead of the individual handling in each pass.
}
/// Manually defined generic "LoopPass" dependency initialization. This is used
@@ -190,6 +193,7 @@
INITIALIZE_PASS_DEPENDENCY(GlobalsAAWrapperPass)
INITIALIZE_PASS_DEPENDENCY(SCEVAAWrapperPass)
INITIALIZE_PASS_DEPENDENCY(ScalarEvolutionWrapperPass)
+ INITIALIZE_PASS_DEPENDENCY(MemorySSAWrapperPass)
}
/// Create MDNode for input string.