Some legalization fixes for atomic load and store.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139851 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/SelectionDAG/LegalizeDAG.cpp

@@ -2971,7 +2971,7 @@ void SelectionDAGLegalize::ExpandNode(SDNode *Node,
   }
   case ISD::ATOMIC_LOAD: {
     // There is no libcall for atomic load; fake it with ATOMIC_CMP_SWAP.
-    SDValue Zero = DAG.getConstant(0, cast<AtomicSDNode>(Node)->getMemoryVT());
+    SDValue Zero = DAG.getConstant(0, Node->getValueType(0));
     SDValue Swap = DAG.getAtomic(ISD::ATOMIC_CMP_SWAP, dl,
                                  cast<AtomicSDNode>(Node)->getMemoryVT(),
                                  Node->getOperand(0),

lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp

@@ -116,6 +116,9 @@ void DAGTypeLegalizer::PromoteIntegerResult(SDNode *N, unsigned ResNo) {
   case ISD::SMULO:
   case ISD::UMULO:       Res = PromoteIntRes_XMULO(N, ResNo); break;
 
+  case ISD::ATOMIC_LOAD:
+    Res = PromoteIntRes_Atomic0(cast<AtomicSDNode>(N)); break;
+
   case ISD::ATOMIC_LOAD_ADD:
   case ISD::ATOMIC_LOAD_SUB:
   case ISD::ATOMIC_LOAD_AND:
@@ -157,6 +160,19 @@ SDValue DAGTypeLegalizer::PromoteIntRes_AssertZext(SDNode *N) {
                      Op.getValueType(), Op, N->getOperand(1));
 }
 
+SDValue DAGTypeLegalizer::PromoteIntRes_Atomic0(AtomicSDNode *N) {
+  EVT ResVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
+  SDValue Res = DAG.getAtomic(N->getOpcode(), N->getDebugLoc(),
+                              N->getMemoryVT(), ResVT,
+                              N->getChain(), N->getBasePtr(),
+                              N->getMemOperand(), N->getOrdering(),
+                              N->getSynchScope());
+  // Legalized the chain result - switch anything that used the old chain to
+  // use the new one.
+  ReplaceValueWith(SDValue(N, 1), Res.getValue(1));
+  return Res;
+}
+
 SDValue DAGTypeLegalizer::PromoteIntRes_Atomic1(AtomicSDNode *N) {
   SDValue Op2 = GetPromotedInteger(N->getOperand(2));
   SDValue Res = DAG.getAtomic(N->getOpcode(), N->getDebugLoc(),
@@ -726,6 +742,9 @@ bool DAGTypeLegalizer::PromoteIntegerOperand(SDNode *N, unsigned OpNo) {
     llvm_unreachable("Do not know how to promote this operator's operand!");
 
   case ISD::ANY_EXTEND:   Res = PromoteIntOp_ANY_EXTEND(N); break;
+  case ISD::ATOMIC_STORE:
+    Res = PromoteIntOp_ATOMIC_STORE(cast<AtomicSDNode>(N));
+    break;
   case ISD::BITCAST:      Res = PromoteIntOp_BITCAST(N); break;
   case ISD::BR_CC:        Res = PromoteIntOp_BR_CC(N, OpNo); break;
   case ISD::BRCOND:       Res = PromoteIntOp_BRCOND(N, OpNo); break;
@@ -811,6 +830,13 @@ SDValue DAGTypeLegalizer::PromoteIntOp_ANY_EXTEND(SDNode *N) {
   return DAG.getNode(ISD::ANY_EXTEND, N->getDebugLoc(), N->getValueType(0), Op);
 }
 
+SDValue DAGTypeLegalizer::PromoteIntOp_ATOMIC_STORE(AtomicSDNode *N) {
+  SDValue Op2 = GetPromotedInteger(N->getOperand(2));
+  return DAG.getAtomic(N->getOpcode(), N->getDebugLoc(), N->getMemoryVT(),
+                       N->getChain(), N->getBasePtr(), Op2, N->getMemOperand(),
+                       N->getOrdering(), N->getSynchScope());
+}
+
 SDValue DAGTypeLegalizer::PromoteIntOp_BITCAST(SDNode *N) {
   // This should only occur in unusual situations like bitcasting to an
   // x86_fp80, so just turn it into a store+load

lib/CodeGen/SelectionDAG/LegalizeTypes.h

@@ -216,6 +216,7 @@ private:
   SDValue PromoteIntRes_MERGE_VALUES(SDNode *N);
   SDValue PromoteIntRes_AssertSext(SDNode *N);
   SDValue PromoteIntRes_AssertZext(SDNode *N);
+  SDValue PromoteIntRes_Atomic0(AtomicSDNode *N);
   SDValue PromoteIntRes_Atomic1(AtomicSDNode *N);
   SDValue PromoteIntRes_Atomic2(AtomicSDNode *N);
   SDValue PromoteIntRes_EXTRACT_SUBVECTOR(SDNode *N);
@@ -258,6 +259,7 @@ private:
   // Integer Operand Promotion.
   bool PromoteIntegerOperand(SDNode *N, unsigned OperandNo);
   SDValue PromoteIntOp_ANY_EXTEND(SDNode *N);
+  SDValue PromoteIntOp_ATOMIC_STORE(AtomicSDNode *N);
   SDValue PromoteIntOp_BITCAST(SDNode *N);
   SDValue PromoteIntOp_BUILD_PAIR(SDNode *N);
   SDValue PromoteIntOp_BR_CC(SDNode *N, unsigned OpNo);

test/CodeGen/ARM/atomic-load-store.ll

@@ -30,3 +30,12 @@ define i32 @test2(i32* %ptr) {
   %val = load atomic i32* %ptr seq_cst, align 4
   ret i32 %val
 }
+
+define void @test3(i8* %ptr1, i8* %ptr2) {
+; ARM: test3
+; ARM: ldrb
+; ARM: strb
+  %val = load atomic i8* %ptr1 unordered, align 1
+  store atomic i8 %val, i8* %ptr2 unordered, align 1
+  ret void
+}