From b6862bbe34be4a832f709596f8dc971ab9895b06 Mon Sep 17 00:00:00 2001
From: Duncan Sands <baldrick@free.fr>
Date: Sun, 14 Dec 2008 09:43:15 +0000
Subject: [PATCH] Reapply r60997, this time without forgetting that target
 constants are allowed to have an illegal type.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61006 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/CodeGen/SelectionDAG.h           |  2 +-
 lib/CodeGen/SelectionDAG/LegalizeDAG.cpp      | 17 ++++++++++++-----
 lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp |  4 ++--
 3 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/include/llvm/CodeGen/SelectionDAG.h b/include/llvm/CodeGen/SelectionDAG.h
index d18e3c3c359..4cbe3b02e49 100644
--- a/include/llvm/CodeGen/SelectionDAG.h
+++ b/include/llvm/CodeGen/SelectionDAG.h
@@ -212,7 +212,7 @@ public:
   ///
   /// Note that this is an involved process that may invalidate pointers into
   /// the graph.
-  void Legalize();
+  void Legalize(bool TypesNeedLegalizing);
 
   /// RemoveDeadNodes - This method deletes all unreachable nodes in the
   /// SelectionDAG.
diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index 6f4158b58c1..3a99a256ccc 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -51,6 +51,7 @@ namespace {
 class VISIBILITY_HIDDEN SelectionDAGLegalize {
   TargetLowering &TLI;
   SelectionDAG &DAG;
+  bool TypesNeedLegalizing;
 
   // Libcall insertion helpers.
   
@@ -127,7 +128,7 @@ class VISIBILITY_HIDDEN SelectionDAGLegalize {
   }
 
 public:
-  explicit SelectionDAGLegalize(SelectionDAG &DAG);
+  explicit SelectionDAGLegalize(SelectionDAG &DAG, bool TypesNeedLegalizing);
 
   /// getTypeAction - Return how we should legalize values of this type, either
   /// it is already legal or we need to expand it into multiple registers of
@@ -348,8 +349,8 @@ SDNode *SelectionDAGLegalize::isShuffleLegal(MVT VT, SDValue Mask) const {
   return TLI.isShuffleMaskLegal(Mask, VT) ? Mask.getNode() : 0;
 }
 
-SelectionDAGLegalize::SelectionDAGLegalize(SelectionDAG &dag)
-  : TLI(dag.getTargetLoweringInfo()), DAG(dag),
+SelectionDAGLegalize::SelectionDAGLegalize(SelectionDAG &dag, bool types)
+  : TLI(dag.getTargetLoweringInfo()), DAG(dag), TypesNeedLegalizing(types),
     ValueTypeActions(TLI.getValueTypeActions()) {
   assert(MVT::LAST_VALUETYPE <= 32 &&
          "Too many value types for ValueTypeActions to hold!");
@@ -488,6 +489,12 @@ bool SelectionDAGLegalize::LegalizeAllNodesNotLeadingTo(SDNode *N, SDNode *Dest,
 /// appropriate for its type.
 void SelectionDAGLegalize::HandleOp(SDValue Op) {
   MVT VT = Op.getValueType();
+  // If the type legalizer was run then we should never see any illegal result
+  // types here except for target constants (the type legalizer does not touch
+  // those).
+  assert((TypesNeedLegalizing || getTypeAction(VT) == Legal ||
+          Op.getOpcode() == ISD::TargetConstant) &&
+         "Illegal type introduced after type legalization?");
   switch (getTypeAction(VT)) {
   default: assert(0 && "Bad type action!");
   case Legal:   (void)LegalizeOp(Op); break;
@@ -8602,9 +8609,9 @@ SDValue SelectionDAGLegalize::StoreWidenVectorOp(StoreSDNode *ST,
 
 // SelectionDAG::Legalize - This is the entry point for the file.
 //
-void SelectionDAG::Legalize() {
+void SelectionDAG::Legalize(bool TypesNeedLegalizing) {
   /// run - This is the main entry point to this class.
   ///
-  SelectionDAGLegalize(*this).LegalizeDAG();
+  SelectionDAGLegalize(*this, TypesNeedLegalizing).LegalizeDAG();
 }
 
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 3d2fb346269..c2b7d3f1db4 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -620,9 +620,9 @@ void SelectionDAGISel::CodeGenAndEmitDAG() {
 
   if (TimePassesIsEnabled) {
     NamedRegionTimer T("DAG Legalization", GroupName);
-    CurDAG->Legalize();
+    CurDAG->Legalize(DisableLegalizeTypes);
   } else {
-    CurDAG->Legalize();
+    CurDAG->Legalize(DisableLegalizeTypes);
   }
   
   DOUT << "Legalized selection DAG:\n";
-- 
2.34.1