how to understand "SplatOpConversion" and "ArithConstantSplatOpConversion"

[Shaquille-Wu]

hello, triton experts,
I learn triton code step by step, and meet some troubles.
I have some questions about "ViewOpToLLVM"(triton/lib/Conversion/VenusGPUToLLVM/ViewOpToLLVM.cc), two converstions in this file: "SplatOpConversion" and "ArithConstantSplatOpConversion"
1). I don't understand what is "with SplatElementsAttr", which SplatOp or ConstantOp contain this attribute?
2). I cannot understand "LLVM::LLVMStructType", why triton apply this class? what is its usage?

Is there any one would like to teach me these secret?