If a pattern's root node is a constant, its size should be 3 rather than 2.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25870 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/utils/TableGen/DAGISelEmitter.cpp b/utils/TableGen/DAGISelEmitter.cpp
index c384f536239e101f1bcbb181aff794e490bc2f1e..f0ecd66fb2f88276f7ce284bdbbdd52f131199b2 100644 (file)
--- a/utils/TableGen/DAGISelEmitter.cpp
+++ b/utils/TableGen/DAGISelEmitter.cpp
@@ -1709,6 +1709,10 @@ static unsigned getPatternSize(TreePatternNode *P, DAGISelEmitter &ISE) {
          P->getExtTypeNum(0) == MVT::Flag && 
          "Not a valid pattern node to size!");
   unsigned Size = 2;  // The node itself.
+  // If the root node is a ConstantSDNode, increases its size.
+  // e.g. (set R32:$dst, 0).
+  if (P->isLeaf() && dynamic_cast<IntInit*>(P->getLeafValue()))
+    Size++;
 
   // 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.