1 files changed, 6 insertions, 1 deletions
diff --git a/llvm/utils/TableGen/CodeGenDAGPatterns.cpp b/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
index 3cc7b1b4ec3..c8ced6b4321 100644
--- a/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
+++ b/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
@@ -805,9 +805,14 @@ static unsigned getPatternSize(const TreePatternNode *P,
   if (P->isLeaf() && isa<IntInit>(P->getLeafValue()))
     Size += 2;
 
+  // FIXME: This is a hack to statically increase the priority of patterns
+  // which maps a sub-dag to a complex pattern. e.g. favors LEA over ADD.
+  // Later we can allow complexity / cost for each pattern to be (optionally)
+  // specified. To get best possible pattern match we'll need to dynamically
+  // calculate the complexity of all patterns a dag can potentially map to.
   const ComplexPattern *AM = P->getComplexPatternInfo(CGP);
   if (AM) {
-    Size += AM->getComplexity();
+    Size += AM->getNumOperands() * 3;
 
     // We don't want to count any children twice, so return early.
     return Size;