From 2f041d49a9750b714a8ceebe28038c78c6c40a4e Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Wed, 19 Oct 2005 04:41:05 +0000
Subject: [PATCH] add support for literal immediates in patterns to match,
 allowing us to write things like this:

def : Pat<(add GPRC:$in, 12),
          (ADD12 GPRC:$in)>;

Andrew: if this isn't enough or doesn't work for you, please lemme know.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23819 91177308-0d34-0410-b5e6-96231b3b80d8
---
 utils/TableGen/DAGISelEmitter.cpp | 30 +++++++++++++++++++++---------
 1 file changed, 21 insertions(+), 9 deletions(-)

diff --git a/utils/TableGen/DAGISelEmitter.cpp b/utils/TableGen/DAGISelEmitter.cpp
index af1b564c36b..8fbbb05f0f8 100644
--- a/utils/TableGen/DAGISelEmitter.cpp
+++ b/utils/TableGen/DAGISelEmitter.cpp
@@ -1472,6 +1472,9 @@ static unsigned getPatternSize(TreePatternNode *P) {
     TreePatternNode *Child = P->getChild(i);
     if (!Child->isLeaf() && Child->getExtType() != MVT::Other)
       Size += getPatternSize(Child);
+    else if (Child->isLeaf() && dynamic_cast<IntInit*>(Child->getLeafValue())) {
+      ++Size;  // Matches a ConstantSDNode.
+    }
   }
   
   return Size;
@@ -1562,15 +1565,24 @@ void DAGISelEmitter::EmitMatchForPattern(TreePatternNode *N,
       }
       
       // Handle leaves of various types.
-      Init *LeafVal = Child->getLeafValue();
-      Record *LeafRec = dynamic_cast<DefInit*>(LeafVal)->getDef();
-      if (LeafRec->isSubClassOf("RegisterClass")) {
-        // Handle register references.  Nothing to do here.
-      } else if (LeafRec->isSubClassOf("ValueType")) {
-        // Make sure this is the specified value type.
-        OS << "      if (cast<VTSDNode>(" << RootName << i << ")->getVT() != "
-           << "MVT::" << LeafRec->getName() << ") goto P" << PatternNo
-           << "Fail;\n";
+      if (DefInit *DI = dynamic_cast<DefInit*>(Child->getLeafValue())) {
+        Record *LeafRec = DI->getDef();
+        if (LeafRec->isSubClassOf("RegisterClass")) {
+          // Handle register references.  Nothing to do here.
+        } else if (LeafRec->isSubClassOf("ValueType")) {
+          // Make sure this is the specified value type.
+          OS << "      if (cast<VTSDNode>(" << RootName << i << ")->getVT() != "
+          << "MVT::" << LeafRec->getName() << ") goto P" << PatternNo
+          << "Fail;\n";
+        } else {
+          Child->dump();
+          assert(0 && "Unknown leaf type!");
+        }
+      } else if (IntInit *II = dynamic_cast<IntInit*>(Child->getLeafValue())) {
+        OS << "      if (!isa<ConstantSDNode>(" << RootName << i << ") ||\n"
+           << "          cast<ConstantSDNode>(" << RootName << i
+           << ")->getValue() != " << II->getValue() << ")\n"
+           << "        goto P" << PatternNo << "Fail;\n";
       } else {
         Child->dump();
         assert(0 && "Unknown leaf type!");
-- 
2.34.1