From bd7b7ca3eeb6dc530426c19130aa246b96116831 Mon Sep 17 00:00:00 2001
From: Simon Pilgrim <llvm-dev@redking.me.uk>
Date: Sat, 15 May 2021 15:49:14 +0100
Subject: [PATCH] Revert rG632668c1c0e7dcf97154d2e377491cdc8cb6963c :
 "[TableGen] TreePatternNode::isIsomorphicTo - early out for matching leafs.
 NFCI."

Revert premature (and very broken....) experimental commit.
---
 llvm/utils/TableGen/CodeGenDAGPatterns.cpp | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/llvm/utils/TableGen/CodeGenDAGPatterns.cpp b/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
index d98fc185e5fb..6e8e832763e7 100644
--- a/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
+++ b/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
@@ -1946,8 +1946,6 @@ bool TreePatternNode::isIsomorphicTo(const TreePatternNode *N,
     return false;
 
   if (isLeaf()) {
-    if (getLeafValue() == N->getLeafValue())
-      return true;
     if (DefInit *DI = dyn_cast<DefInit>(getLeafValue())) {
       if (DefInit *NDI = dyn_cast<DefInit>(N->getLeafValue())) {
         return ((DI->getDef() == NDI->getDef())
@@ -1955,7 +1953,7 @@ bool TreePatternNode::isIsomorphicTo(const TreePatternNode *N,
                     || getName() == N->getName()));
       }
     }
-    return false;
+    return getLeafValue() == N->getLeafValue();
   }
 
   if (N->getOperator() != getOperator() ||