https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91628
--- Comment #9 from rdapp at linux dot ibm.com --- (In reply to Florian Weimer from comment #8) > Calling functions from inline assembly is always a bit iffy. For example, > your code lacks clobbers for the vector registers (if present) and the > condition code register. I don't know if s390/s390x has a red zone, or > specific call frame setup requirements (the psABI is ambiguous regarding the > latter for functions whose arguments all fit into registers, as it is the > case here). > > I would suggest not to use inline assembly for this purpose. Right about the missing registers. I was wary about building with an older GCC but the support only started with GCC9 so this should not be a problem. Apparently we can also add vector clobbers with -mno-vx. I opted for inline assembly to make sure r12 is not changed directly before the function call. Do you have an idea to guarantee this in another way?
