Support for load/store of expanded float types. I

don't know if a truncating store is possible here,
but added support for it anyway.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52577 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/SelectionDAG/LegalizeFloatTypes.cpp

@@ -404,6 +404,8 @@ void DAGTypeLegalizer::ExpandFloatResult(SDNode *N, unsigned ResNo) {
   case ISD::BIT_CONVERT:        ExpandRes_BIT_CONVERT(N, Lo, Hi); break;
   case ISD::BUILD_PAIR:         ExpandRes_BUILD_PAIR(N, Lo, Hi); break;
   case ISD::EXTRACT_VECTOR_ELT: ExpandRes_EXTRACT_VECTOR_ELT(N, Lo, Hi); break;
+
+  case ISD::LOAD: ExpandFloatRes_LOAD(N, Lo, Hi); break;
   }
 
   // If Lo/Hi is null, the sub-method took care of registering results etc.
@@ -411,6 +413,38 @@ void DAGTypeLegalizer::ExpandFloatResult(SDNode *N, unsigned ResNo) {
     SetExpandedFloat(SDOperand(N, ResNo), Lo, Hi);
 }
 
+void DAGTypeLegalizer::ExpandFloatRes_LOAD(SDNode *N, SDOperand &Lo,
+                                           SDOperand &Hi) {
+  if (ISD::isNON_EXTLoad(N)) {
+    ExpandRes_NON_EXTLOAD(N, Lo, Hi);
+    return;
+  }
+
+  assert(ISD::isUNINDEXEDLoad(N) && "Indexed load during type legalization!");
+  LoadSDNode *LD = cast<LoadSDNode>(N);
+  SDOperand Chain = LD->getChain();
+  SDOperand Ptr = LD->getBasePtr();
+
+  MVT NVT = TLI.getTypeToTransformTo(LD->getValueType(0));
+  assert(NVT.isByteSized() && "Expanded type not byte sized!");
+  assert(LD->getMemoryVT().bitsLE(NVT) && "Float type not round?");
+
+  Lo = DAG.getExtLoad(LD->getExtensionType(), NVT, Chain, Ptr,
+                      LD->getSrcValue(), LD->getSrcValueOffset(),
+                      LD->getMemoryVT(),
+                      LD->isVolatile(), LD->getAlignment());
+
+  // Remember the chain.
+  Chain = Lo.getValue(1);
+
+  // The high part is undefined.
+  Hi = DAG.getNode(ISD::UNDEF, NVT);
+
+  // Modified the chain - switch anything that used the old chain to use the
+  // new one.
+  ReplaceValueWith(SDOperand(LD, 1), Chain);
+}
+
 
 //===----------------------------------------------------------------------===//
 //  Float Operand Expansion
@@ -441,6 +475,10 @@ bool DAGTypeLegalizer::ExpandFloatOperand(SDNode *N, unsigned OpNo) {
     case ISD::BIT_CONVERT:     Res = ExpandOp_BIT_CONVERT(N); break;
     case ISD::BUILD_VECTOR:    Res = ExpandOp_BUILD_VECTOR(N); break;
     case ISD::EXTRACT_ELEMENT: Res = ExpandOp_EXTRACT_ELEMENT(N); break;
+
+    case ISD::STORE:
+      Res = ExpandFloatOp_STORE(cast<StoreSDNode>(N), OpNo);
+      break;
     }
   }
 
@@ -462,3 +500,27 @@ bool DAGTypeLegalizer::ExpandFloatOperand(SDNode *N, unsigned OpNo) {
   ReplaceValueWith(SDOperand(N, 0), Res);
   return false;
 }
+
+SDOperand DAGTypeLegalizer::ExpandFloatOp_STORE(SDNode *N, unsigned OpNo) {
+  if (ISD::isNON_TRUNCStore(N))
+    return ExpandOp_NON_TRUNCStore(N, OpNo);
+
+  assert(ISD::isUNINDEXEDStore(N) && "Indexed store during type legalization!");
+  assert(OpNo == 1 && "Can only expand the stored value so far");
+  StoreSDNode *ST = cast<StoreSDNode>(N);
+
+  SDOperand Chain = ST->getChain();
+  SDOperand Ptr = ST->getBasePtr();
+
+  MVT NVT = TLI.getTypeToTransformTo(ST->getValue().getValueType());
+  assert(NVT.isByteSized() && "Expanded type not byte sized!");
+  assert(ST->getMemoryVT().bitsLE(NVT) && "Float type not round?");
+
+  SDOperand Lo, Hi;
+  GetExpandedOp(ST->getValue(), Lo, Hi);
+
+  return DAG.getTruncStore(Chain, Lo, Ptr,
+                           ST->getSrcValue(), ST->getSrcValueOffset(),
+                           ST->getMemoryVT(),
+                           ST->isVolatile(), ST->getAlignment());
+}

lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp

@@ -1875,7 +1875,7 @@ SDOperand DAGTypeLegalizer::ExpandIntOp_STORE(StoreSDNode *N, unsigned OpNo) {
   bool isVolatile = N->isVolatile();
   SDOperand Lo, Hi;
 
-  assert(!(NVT.getSizeInBits() & 7) && "Expanded type not byte sized!");
+  assert(NVT.isByteSized() && "Expanded type not byte sized!");
 
   if (N->getMemoryVT().bitsLE(NVT)) {
     GetExpandedInteger(N->getValue(), Lo, Hi);

lib/CodeGen/SelectionDAG/LegalizeTypes.h

@@ -347,9 +347,11 @@ private:
 
   // Float Result Expansion.
   void ExpandFloatResult(SDNode *N, unsigned ResNo);
+  void ExpandFloatRes_LOAD(SDNode *N, SDOperand &Lo, SDOperand &Hi);
 
   // Float Operand Expansion.
   bool ExpandFloatOperand(SDNode *N, unsigned OperandNo);
+  SDOperand ExpandFloatOp_STORE(SDNode *N, unsigned OpNo);
 
   //===--------------------------------------------------------------------===//
   // Scalarization Support: LegalizeVectorTypes.cpp

test/CodeGen/PowerPC/2008-06-21-F128LoadStore.ll

@@ -0,0 +1,10 @@
+; RUN: llvm-as < %s | llc -march=ppc32
+
+@g = external global ppc_fp128
+@h = external global ppc_fp128
+
+define void @f() {
+	%tmp = load ppc_fp128* @g
+	store ppc_fp128 %tmp, ppc_fp128* @h
+	ret void
+}