Dear all, Is there a way to have llvm-gcc output the llvm va_arg intrinsic? As far as I understand, llvm-gcc directly lowers va_arg in the frontend using the TARGET_GIMPLIFY_VA_ARG target hook. I am aware that va_arg segfaults on x86-64 (http://llvm.org/bugs/show_bug.cgi?id=1740) and that llvm-gcc avoids this issue by always lowering calls to va_arg (http://old.nabble.com/va_arg-td25197836.html). However, I am developing an llvm backend (similar to the CBackend) that would like to handle va_arg as intrinsic from llvm-gcc. How can I modify llvm-gcc to generate the llvm va_arg instrinsic? With my little understanding of llvmg/gcc, I can try to modify the TARGET_GIMPLIFY_VA_ARG hook to create a new gcc builtin for va_arg and convert the tree code somehow to llvm in llvm-convert.c, EmitBuiltinCall(), but would really appreciate any advice on how to tackle the problem. Cheers, Martijn Rutten