[PostRAMachineSink] preserve CFG

Summary: Mark CFG is preserved  since this pass do not make any change in CFG.

Reviewers: sebpop, mzolotukhin, mcrosier

Reviewed By: mzolotukhin

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D44845

llvm-svn: 328727

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/MachineSink.cpp b/llvm/lib/CodeGen/MachineSink.cpp
index 97ddce3e9d2..2fcad0cc97a 100644
--- a/llvm/lib/CodeGen/MachineSink.cpp
+++ b/llvm/lib/CodeGen/MachineSink.cpp
@@ -948,6 +948,11 @@ public:
   PostRAMachineSinking() : MachineFunctionPass(ID) {}
   StringRef getPassName() const override { return "PostRA Machine Sink"; }
 
+  void getAnalysisUsage(AnalysisUsage &AU) const override {
+    AU.setPreservesCFG();
+    MachineFunctionPass::getAnalysisUsage(AU);
+  }
+
 private:
   /// Track which registers have been modified and used.
   BitVector ModifiedRegs, UsedRegs;