the cell backend is making all sorts of unsafe and incorrect assumptions

about ownership and update policies.  It isn't clear why it is doing all
this lowering at isel time instead of in legalize.  This fixes fcmp64.ll

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96849 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/CellSPU/SPUISelDAGToDAG.cpp b/lib/Target/CellSPU/SPUISelDAGToDAG.cpp
index 1ed06e3..e965f18 100644 (file)
--- a/lib/Target/CellSPU/SPUISelDAGToDAG.cpp
+++ b/lib/Target/CellSPU/SPUISelDAGToDAG.cpp
@@ -294,15 +294,18 @@ namespace {
           ((vecVT == MVT::v2i64) &&
            ((SPU::get_vec_i16imm(bvNode, *CurDAG, MVT::i64).getNode() != 0) ||
             (SPU::get_ILHUvec_imm(bvNode, *CurDAG, MVT::i64).getNode() != 0) ||
-            (SPU::get_vec_u18imm(bvNode, *CurDAG, MVT::i64).getNode() != 0))))
-        return Select(bvNode);
+            (SPU::get_vec_u18imm(bvNode, *CurDAG, MVT::i64).getNode() != 0)))) {
+        HandleSDNode Dummy(SDValue(bvNode, 0));
+        Select(bvNode);
+        return Dummy.getValue().getNode();
+      }
 
       // No, need to emit a constant pool spill:
       std::vector<Constant*> CV;
 
       for (size_t i = 0; i < bvNode->getNumOperands(); ++i) {
         ConstantSDNode *V = dyn_cast<ConstantSDNode > (bvNode->getOperand(i));
-        CV.push_back(const_cast<ConstantInt *> (V->getConstantIntValue()));
+        CV.push_back(const_cast<ConstantInt *>(V->getConstantIntValue()));
       }
 
       Constant *CP = ConstantVector::get(CV);
@@ -311,10 +314,14 @@ namespace {
       SDValue CGPoolOffset =
               SPU::LowerConstantPool(CPIdx, *CurDAG,
                                      SPUtli.getSPUTargetMachine());
-      return SelectCode(CurDAG->getLoad(vecVT, dl,
-                                        CurDAG->getEntryNode(), CGPoolOffset,
-                                        PseudoSourceValue::getConstantPool(), 0,
-                                        false, false, Alignment).getNode());
+      
+      HandleSDNode Dummy(CurDAG->getLoad(vecVT, dl,
+                                         CurDAG->getEntryNode(), CGPoolOffset,
+                                         PseudoSourceValue::getConstantPool(),0,
+                                         false, false, Alignment));
+      CurDAG->ReplaceAllUsesWith(SDValue(bvNode, 0), Dummy.getValue());
+      SelectCode(Dummy.getValue().getNode());
+      return Dummy.getValue().getNode();
     }
 
     /// Select - Convert the specified operand from a target-independent to a
@@ -692,9 +699,8 @@ SPUDAGToDAGISel::Select(SDNode *N) {
   SDValue Ops[8];
   DebugLoc dl = N->getDebugLoc();
 
-  if (N->isMachineOpcode()) {
+  if (N->isMachineOpcode())
     return NULL;   // Already selected.
-  }
 
   if (Opc == ISD::FrameIndex) {
     int FI = cast<FrameIndexSDNode>(N)->getIndex();
@@ -773,29 +779,44 @@ SPUDAGToDAGISel::Select(SDNode *N) {
     // re-use it in the VEC2PREFSLOT selection without needing to explicitly
     // call SelectCode (it's already done for us.)
     SelectCode(CurDAG->getNode(ISD::BIT_CONVERT, dl, OpVecVT, zextShuffle).getNode());
-    return SelectCode(CurDAG->getNode(SPUISD::VEC2PREFSLOT, dl, OpVT,
-                                      zextShuffle).getNode());
+    HandleSDNode Dummy(CurDAG->getNode(SPUISD::VEC2PREFSLOT, dl, OpVT,
+                                      zextShuffle));
+    
+    CurDAG->ReplaceAllUsesWith(N, Dummy.getValue().getNode());
+    SelectCode(Dummy.getValue().getNode());
+    return Dummy.getValue().getNode();
   } else if (Opc == ISD::ADD && (OpVT == MVT::i64 || OpVT == MVT::v2i64)) {
     SDNode *CGLoad =
             emitBuildVector(getCarryGenerateShufMask(*CurDAG, dl).getNode());
 
-    return SelectCode(CurDAG->getNode(SPUISD::ADD64_MARKER, dl, OpVT,
-                                      N->getOperand(0), N->getOperand(1),
-                                      SDValue(CGLoad, 0)).getNode());
+    HandleSDNode Dummy(CurDAG->getNode(SPUISD::ADD64_MARKER, dl, OpVT,
+                                       N->getOperand(0), N->getOperand(1),
+                                       SDValue(CGLoad, 0)));
+    
+    CurDAG->ReplaceAllUsesWith(N, Dummy.getValue().getNode());
+    SelectCode(Dummy.getValue().getNode());
+    return Dummy.getValue().getNode();
   } else if (Opc == ISD::SUB && (OpVT == MVT::i64 || OpVT == MVT::v2i64)) {
     SDNode *CGLoad =
             emitBuildVector(getBorrowGenerateShufMask(*CurDAG, dl).getNode());
 
-    return SelectCode(CurDAG->getNode(SPUISD::SUB64_MARKER, dl, OpVT,
-                                      N->getOperand(0), N->getOperand(1),
-                                      SDValue(CGLoad, 0)).getNode());
+    HandleSDNode Dummy(CurDAG->getNode(SPUISD::SUB64_MARKER, dl, OpVT,
+                                       N->getOperand(0), N->getOperand(1),
+                                       SDValue(CGLoad, 0)));
+    
+    CurDAG->ReplaceAllUsesWith(N, Dummy.getValue().getNode());
+    SelectCode(Dummy.getValue().getNode());
+    return Dummy.getValue().getNode();
   } else if (Opc == ISD::MUL && (OpVT == MVT::i64 || OpVT == MVT::v2i64)) {
     SDNode *CGLoad =
             emitBuildVector(getCarryGenerateShufMask(*CurDAG, dl).getNode());
 
-    return SelectCode(CurDAG->getNode(SPUISD::MUL64_MARKER, dl, OpVT,
-                                      N->getOperand(0), N->getOperand(1),
-                                      SDValue(CGLoad, 0)).getNode());
+    HandleSDNode Dummy(CurDAG->getNode(SPUISD::MUL64_MARKER, dl, OpVT,
+                                       N->getOperand(0), N->getOperand(1),
+                                       SDValue(CGLoad, 0)));
+    CurDAG->ReplaceAllUsesWith(N, Dummy.getValue().getNode());
+    SelectCode(Dummy.getValue().getNode());
+    return Dummy.getValue().getNode();
   } else if (Opc == ISD::TRUNCATE) {
     SDValue Op0 = N->getOperand(0);
     if ((Op0.getOpcode() == ISD::SRA || Op0.getOpcode() == ISD::SRL)
@@ -832,17 +853,14 @@ SPUDAGToDAGISel::Select(SDNode *N) {
       }
     }
   } else if (Opc == ISD::SHL) {
-    if (OpVT == MVT::i64) {
+    if (OpVT == MVT::i64)
       return SelectSHLi64(N, OpVT);
-    }
   } else if (Opc == ISD::SRL) {
-    if (OpVT == MVT::i64) {
+    if (OpVT == MVT::i64)
       return SelectSRLi64(N, OpVT);
-    }
   } else if (Opc == ISD::SRA) {
-    if (OpVT == MVT::i64) {
+    if (OpVT == MVT::i64)
       return SelectSRAi64(N, OpVT);
-    }
   } else if (Opc == ISD::FNEG
              && (OpVT == MVT::f64 || OpVT == MVT::v2f64)) {
     DebugLoc dl = N->getDebugLoc();