[Hexagon] Handle expansion of cmpxchg

llvm-svn: 273432

1 files changed, 10 insertions, 0 deletions

diff --git a/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp b/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
index b29a43d8aae..42feffc3201 100644
--- a/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
@@ -1715,6 +1715,9 @@ HexagonTargetLowering::HexagonTargetLowering(const TargetMachine &TM,
   setMinFunctionAlignment(2);
   setStackPointerRegisterToSaveRestore(HRI.getStackRegister());
 
+  setMaxAtomicSizeInBitsSupported(64);
+  setMinCmpXchgSizeInBits(32);
+
   if (EnableHexSDNodeSched)
     setSchedulingPreference(Sched::VLIW);
   else
@@ -3121,3 +3124,10 @@ bool HexagonTargetLowering::shouldExpandAtomicStoreInIR(StoreInst *SI) const {
   // Do not expand loads and stores that don't exceed 64 bits.
   return SI->getValueOperand()->getType()->getPrimitiveSizeInBits() > 64;
 }
+
+bool HexagonTargetLowering::shouldExpandAtomicCmpXchgInIR(
+      AtomicCmpXchgInst *AI) const {
+  const DataLayout &DL = AI->getModule()->getDataLayout();
+  unsigned Size = DL.getTypeStoreSize(AI->getCompareOperand()->getType());
+  return Size >= 4 && Size <= 8;
+}