search for: getmemcpyloadsandstores

...39;re seeing. Specifically, a 3 byte struct (for example) ought to either lower to: load i16, load i8 + stores if your target can do misaligned i16 operations. or load i8, load i8, load i8 + stores if not. Neither of those involve shifting operations. I'd suggest breaking just after getMemcpyLoadsAndStores and using SelectionDAG::dump to see exactly what it's created. Then try to work out where that gets pessimized to shifts, because it's not normal. Cheers. Tim.

Hi John, On Tue, 14 May 2019 at 17:51, Joan Lluch <joan.lluch at icloud.com> wrote: > This problem is also shared by the MSP430 target, and it’s very easy to reproduce by just compiling the code that I posted before. That's some good detective work; it definitely explains what you're seeing. Since MSP430 is affected it would probably be pretty easy to upstream an alignment-aware

Dear LLVM-Mailing list, I have a beginners question again - please don't be mad at me! I was playing around with llvm::Module instance and ended in iterating over all global values and functions. I then noticed the function "llvm.memcpy". As I understood, this is an intrinsic coming from the LLVM. So far so good! I then emitted an object file with the llvm::ExecutionEngine and

I had already adjusted MaxStoresPerMemcpy to my preferred value, and this works great but for the cases where load/stores are used on non-size aligned structs the odd behaviour still happens. For my 3-char, 3-byte struct test, the memcpy replacement appears to consist on a single byte load and store of the last char (this is correct), followed by a 16 bit move of the first two chars, this is also

...cpp.o) getMemmoveLoadsAndStores(llvm::SelectionDAG&, llvm::DebugLoc, llvm::SDValue, llvm::SDValue, llvm::SDValue, unsigned long long, unsigned int, bool, bool, llvm::Value const*, unsigned long long, llvm::Value const*, unsigned long long)in libLLVMSelectionDAG.a(SelectionDAG.cpp.o) getMemcpyLoadsAndStores(llvm::SelectionDAG&, llvm::DebugLoc, llvm::SDValue, llvm::SDValue, llvm::SDValue, unsigned long long, unsigned int, bool, bool, llvm::Value const*, unsigned long long, llvm::Value const*, unsigned long long)in libLLVMSelectionDAG.a(SelectionDAG.cpp.o) llvm::TargetLowering::LowerCallTo(llv...