fix a long standing wart: all the ComplexPattern's were being

passed the root of the match, even though only a few patterns
actually needed this (one in X86, several in ARM [which should
be refactored anyway], and some in CellSPU that I don't feel 
like detangling).   Instead of requiring all ComplexPatterns to
take the dead root, have targets opt into getting the root by
putting SDNPWantRoot on the ComplexPattern.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114471 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 1 deletions

diff --git a/utils/TableGen/DAGISelMatcherEmitter.cpp b/utils/TableGen/DAGISelMatcherEmitter.cpp
index dfbfe80c0a..5117737c5f 100644
--- a/utils/TableGen/DAGISelMatcherEmitter.cpp
+++ b/utils/TableGen/DAGISelMatcherEmitter.cpp
@@ -649,7 +649,13 @@ void MatcherTableEmitter::EmitPredicateFunctions(formatted_raw_ostream &OS) {
       OS << "    Result.resize(NextRes+" << NumOps << ");\n";
       OS << "    return "  << P.getSelectFunc();
 
-      OS << "(Root, N";
+      OS << "(";
+      // If the complex pattern wants the root of the match, pass it in as the
+      // first argument.
+      if (P.hasProperty(SDNPWantRoot))
+        OS << "Root, ";
+      
+      OS << "N";
       for (unsigned i = 0; i != NumOps; ++i)
         OS << ", Result[NextRes+" << i << ']';
       OS << ");\n";