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| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index 845b9a3..3ca1b4f 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -3811,6 +3811,24 @@ static SDValue getMemmoveLoadsAndStores(SelectionDAG &DAG, SDLoc dl, &OutChains[0], OutChains.size()); } +/// \brief Lower the call to 'memset' intrinsic function into a series of store +/// operations. +/// +/// \param DAG Selection DAG where lowered code is placed. +/// \param dl Link to corresponding IR location. +/// \param Chain Control flow dependency. +/// \param Dst Pointer to destination memory location. +/// \param Src Value of byte to write into the memory. +/// \param Size Number of bytes to write. +/// \param Align Alignment of the destination in bytes. +/// \param isVol True if destination is volatile. +/// \param DstPtrInfo IR information on the memory pointer. +/// \returns New head in the control flow, if lowering was successful, empty +/// SDValue otherwise. +/// +/// The function tries to replace 'llvm.memset' intrinsic with several store +/// operations and value calculation code. This is usually profitable for small +/// memory size. static SDValue getMemsetStores(SelectionDAG &DAG, SDLoc dl, SDValue Chain, SDValue Dst, SDValue Src, uint64_t Size, |