[MemorySSA] Expose the verify as a debug option.

Summary: Expose VerifyMemorySSA as a debug option. If set, passes will call the MSSA->verifyMemorySSA() after calling into the updater's APIs when MemorySSA should be valid.

Reviewers: george.burgess.iv

Subscribers: sanjoy, jlebar, Prazek, llvm-commits

Differential Revision: https://reviews.llvm.org/D50749

llvm-svn: 339795

1 files changed, 9 insertions, 3 deletions

diff --git a/llvm/lib/Analysis/MemorySSA.cpp b/llvm/lib/Analysis/MemorySSA.cpp
index b38c0c4f143..734dee2bcf1 100644
--- a/llvm/lib/Analysis/MemorySSA.cpp
+++ b/llvm/lib/Analysis/MemorySSA.cpp
@@ -77,9 +77,15 @@ static cl::opt<unsigned> MaxCheckLimit(
     cl::desc("The maximum number of stores/phis MemorySSA"
              "will consider trying to walk past (default = 100)"));
 
-static cl::opt<bool>
-    VerifyMemorySSA("verify-memoryssa", cl::init(false), cl::Hidden,
-                    cl::desc("Verify MemorySSA in legacy printer pass."));
+// Always verify MemorySSA if expensive checking is enabled.
+#ifdef EXPENSIVE_CHECKS
+bool llvm::VerifyMemorySSA = true;
+#else
+bool llvm::VerifyMemorySSA = false;
+#endif
+static cl::opt<bool, true>
+    VerifyMemorySSAX("verify-memoryssa", cl::location(VerifyMemorySSA),
+                     cl::Hidden, cl::desc("Enable verification of MemorySSA."));
 
 namespace llvm {