From d22ec5f62813f8cf2ed8091f44a14377209b1a59 Mon Sep 17 00:00:00 2001
From: Duncan Sands <baldrick@free.fr>
Date: Wed, 29 Oct 2008 14:22:20 +0000
Subject: [PATCH] Add sanity checking for BUILD_PAIR (I noticed the other day
 that PPC custom lowering could create a BUILD_PAIR of two f64 with a result
 type of... f64! - already fixed).  Fix a place that triggers the sanity
 check.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58378 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/CodeGen/ValueTypes.h             | 18 +++++++++++++++
 lib/CodeGen/SelectionDAG/SelectionDAG.cpp     | 22 +++++++++++++++----
 .../SelectionDAG/SelectionDAGBuild.cpp        |  9 +++++---
 3 files changed, 42 insertions(+), 7 deletions(-)

diff --git a/include/llvm/CodeGen/ValueTypes.h b/include/llvm/CodeGen/ValueTypes.h
index f1b489ee3b3..c4bcaf174a9 100644
--- a/include/llvm/CodeGen/ValueTypes.h
+++ b/include/llvm/CodeGen/ValueTypes.h
@@ -142,6 +142,24 @@ namespace llvm {
     inline bool operator== (const MVT VT) const { return V == VT.V; }
     inline bool operator!= (const MVT VT) const { return V != VT.V; }
 
+    /// getFloatingPointVT - Returns the MVT that represents a floating point
+    /// type with the given number of bits.  There are two floating point types
+    /// with 128 bits - this returns f128 rather than ppcf128.
+    static inline MVT getFloatingPointVT(unsigned BitWidth) {
+      switch (BitWidth) {
+      default:
+        assert(false && "Bad bit width!");
+      case 32:
+        return f32;
+      case 64:
+        return f64;
+      case 80:
+        return f80;
+      case 128:
+        return f128;
+      }
+    }
+
     /// getIntegerVT - Returns the MVT that represents an integer with the given
     /// number of bits.
     static inline MVT getIntegerVT(unsigned BitWidth) {
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 3d809b4983d..0c737261aa6 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -758,11 +758,25 @@ void SelectionDAG::VerifyNode(SDNode *N) {
   switch (N->getOpcode()) {
   default:
     break;
+  case ISD::BUILD_PAIR: {
+    MVT VT = N->getValueType(0);
+    assert(N->getNumValues() == 1 && "Too many results!");
+    assert(!VT.isVector() && (VT.isInteger() || VT.isFloatingPoint()) &&
+           "Wrong return type!");
+    assert(N->getNumOperands() == 2 && "Wrong number of operands!");
+    assert(N->getOperand(0).getValueType() == N->getOperand(1).getValueType() &&
+           "Mismatched operand types!");
+    assert(N->getOperand(0).getValueType().isInteger() == VT.isInteger() &&
+           "Wrong operand type!");
+    assert(VT.getSizeInBits() == 2 * N->getOperand(0).getValueSizeInBits() &&
+           "Wrong return type size");
+    break;
+  }
   case ISD::BUILD_VECTOR: {
-    assert(N->getNumValues() == 1 && "Too many results for BUILD_VECTOR!");
-    assert(N->getValueType(0).isVector() && "Wrong BUILD_VECTOR return type!");
+    assert(N->getNumValues() == 1 && "Too many results!");
+    assert(N->getValueType(0).isVector() && "Wrong return type!");
     assert(N->getNumOperands() == N->getValueType(0).getVectorNumElements() &&
-           "Wrong number of BUILD_VECTOR operands!");
+           "Wrong number of operands!");
     // FIXME: Change vector_shuffle to a variadic node with mask elements being
     // operands of the node.  Currently the mask is a BUILD_VECTOR passed as an
     // operand, and it is not always possible to legalize it.  Turning off the
@@ -770,7 +784,7 @@ void SelectionDAG::VerifyNode(SDNode *N) {
 //    MVT EltVT = N->getValueType(0).getVectorElementType();
 //    for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ++I)
 //      assert(I->getSDValue().getValueType() == EltVT &&
-//             "Wrong BUILD_VECTOR operand type!");
+//             "Wrong operand type!");
     break;
   }
   }
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
index d04daeb76b5..e34e78fca6d 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
@@ -390,14 +390,17 @@ static SDValue getCopyFromParts(SelectionDAG &DAG,
         ValueVT : MVT::getIntegerVT(RoundBits);
       SDValue Lo, Hi;
 
+      MVT HalfVT = ValueVT.isInteger() ?
+        MVT::getIntegerVT(RoundBits/2) :
+        MVT::getFloatingPointVT(RoundBits/2);
+
       if (RoundParts > 2) {
-        MVT HalfVT = MVT::getIntegerVT(RoundBits/2);
         Lo = getCopyFromParts(DAG, Parts, RoundParts/2, PartVT, HalfVT);
         Hi = getCopyFromParts(DAG, Parts+RoundParts/2, RoundParts/2,
                               PartVT, HalfVT);
       } else {
-        Lo = Parts[0];
-        Hi = Parts[1];
+        Lo = DAG.getNode(ISD::BIT_CONVERT, HalfVT, Parts[0]);
+        Hi = DAG.getNode(ISD::BIT_CONVERT, HalfVT, Parts[1]);
       }
       if (TLI.isBigEndian())
         std::swap(Lo, Hi);