search for: bycopi

Hi all, I have been looking at how to convert by-reference captures into by-copy captures for captured statements and possibly C++ lambdas, and am looking for some feedback on my approach. The motivation for trying to use copy captures is to avoid unnecessary loads that are otherwise required inside the outlined function. This can be important when the outlined function represents the body of a

Hi Rafael, > 2) add a "byref" mark in the pointer argument. I think you mean "bycopy" or "byval" here. > 3) Have llvm-gcc create a copy before calling the function. Don't forget that the function may be called by code that was not compiled by LLVM. That's why we have to pay attention to the ABI! Solution (3) supposes we have control over both

> > 2) add a "byref" mark in the pointer argument. > > I think you mean "bycopy" or "byval" here. Yes, good catch. > > 3) Have llvm-gcc create a copy before calling the function. > > Don't forget that the function may be called by code that > was not compiled by LLVM. That's why we have to pay attention > to the ABI! Solution

This is my current understanding of the current situation and the proposed solution. Currently llvm-gcc compiles ----------------------- struct cpp_num { unsigned long high; unsigned long low; char unsignedp; }; void g(unsigned long); void f(struct cpp_num num) { g(num.high + 1); } ---------------------- into ---------------------------------------------------------------------------