[PATCH] D132982: [LoopInterchange] Unwanted positive dependency checking of Outerloop removed.

[Ramkrishnan Narayanan Komala via Phabricator via llvm-commits]

ram-NK created this revision.
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https://reviews.llvm.org/D132982

Files:
  llvm/lib/Transforms/Scalar/LoopInterchange.cpp


Index: llvm/lib/Transforms/Scalar/LoopInterchange.cpp
===================================================================
--- llvm/lib/Transforms/Scalar/LoopInterchange.cpp
+++ llvm/lib/Transforms/Scalar/LoopInterchange.cpp
@@ -181,20 +181,6 @@
     std::swap(DepMatrix[I][ToIndx], DepMatrix[I][FromIndx]);
 }
 
-// Checks if outermost non '=','S'or'I' dependence in the dependence matrix is
-// '>'
-static bool isOuterMostDepPositive(CharMatrix &DepMatrix, unsigned Row,
-                                   unsigned Column) {
-  for (unsigned i = 0; i <= Column; ++i) {
-    if (DepMatrix[Row][i] == '<')
-      return false;
-    if (DepMatrix[Row][i] == '>')
-      return true;
-  }
-  // All dependencies were '=','S' or 'I'
-  return false;
-}
-
 // Checks if no dependence exist in the dependency matrix in Row before Column.
 static bool containsNoDependence(CharMatrix &DepMatrix, unsigned Row,
                                  unsigned Column) {
@@ -209,9 +195,6 @@
 static bool validDepInterchange(CharMatrix &DepMatrix, unsigned Row,
                                 unsigned OuterLoopId, char InnerDep,
                                 char OuterDep) {
-  if (isOuterMostDepPositive(DepMatrix, Row, OuterLoopId))
-    return false;
-
   if (InnerDep == OuterDep)
     return true;
 


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