(store (op (load ...)), ...)
If store's chain operand is load, then use load's chain operand instead. If
it isn't (likely a TokenFactor), then do not allow the folding.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25708 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/DAGISelEmitter.cpp b/utils/TableGen/DAGISelEmitter.cpp
index f8ed5de..9aa4f98 100644
--- a/utils/TableGen/DAGISelEmitter.cpp
+++ b/utils/TableGen/DAGISelEmitter.cpp
@@ -1931,9 +1931,16 @@
<< ".getValue(" << CInfo.getNumResults() << "))) goto P"
<< PatternNo << "Fail; // Already selected for a chain use?\n";
}
- if (NodeHasChain && !FoundChain) {
- OS << " SDOperand Chain = " << RootName << ".getOperand(0);\n";
- FoundChain = true;
+ if (NodeHasChain) {
+ if (!FoundChain) {
+ OS << " SDOperand Chain = " << RootName << ".getOperand(0);\n";
+ FoundChain = true;
+ } else {
+ OS << " if (Chain.Val == " << RootName << ".Val)\n";
+ OS << " Chain = " << RootName << ".getOperand(0);\n";
+ OS << " else\n";
+ OS << " goto P" << PatternNo << "Fail;\n";
+ }
}
}