[LoopUtils] Move def of findStringMetadataForLoop to LoopUtils.cpp. NFC

The decl is in LoopUtils.h.  I think that this was added to
LoopVersioningLICM.cpp by mistake.

llvm-svn: 267014

1 files changed, 22 insertions, 0 deletions

diff --git a/llvm/lib/Transforms/Utils/LoopUtils.cpp b/llvm/lib/Transforms/Utils/LoopUtils.cpp
index a2964c3..79bfea0 100644
--- a/llvm/lib/Transforms/Utils/LoopUtils.cpp
+++ b/llvm/lib/Transforms/Utils/LoopUtils.cpp
@@ -822,3 +822,25 @@ void llvm::initializeLoopPassPass(PassRegistry &Registry) {
   INITIALIZE_PASS_DEPENDENCY(SCEVAAWrapperPass)
   INITIALIZE_PASS_DEPENDENCY(ScalarEvolutionWrapperPass)
 }
+
+/// \brief Find string metadata for loop, if it exist return true, else return
+/// false.
+bool llvm::findStringMetadataForLoop(Loop *TheLoop, StringRef Name) {
+  MDNode *LoopID = TheLoop->getLoopID();
+  // Return false if LoopID is false.
+  if (!LoopID)
+    return false;
+  // Iterate over LoopID operands and look for MDString Metadata
+  for (unsigned i = 1, e = LoopID->getNumOperands(); i < e; ++i) {
+    MDNode *MD = dyn_cast<MDNode>(LoopID->getOperand(i));
+    if (!MD)
+      continue;
+    MDString *S = dyn_cast<MDString>(MD->getOperand(0));
+    if (!S)
+      continue;
+    // Return true if MDString holds expected MetaData.
+    if (Name.equals(S->getString()))
+      return true;
+  }
+  return false;
+}