If a pattern's root node is a constant, its size should be 3 rather than 2.
llvm-svn: 25870
diff --git a/llvm/utils/TableGen/DAGISelEmitter.cpp b/llvm/utils/TableGen/DAGISelEmitter.cpp
index c384f53..f0ecd66 100644
--- a/llvm/utils/TableGen/DAGISelEmitter.cpp
+++ b/llvm/utils/TableGen/DAGISelEmitter.cpp
@@ -1709,6 +1709,10 @@
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.