>1) Does the __builtin function identically to the asm in the Boehm-gc? > Returning the same address too?
The builtin function gives you an inline flushrs instruction. The result here will be slightly different than calling a function that uses flushrs, but this may not matter for your purpose. >2) Looking over the boehm code, am I correct in guessing that this is > also the case on hppa (HP PA-RISC)? ia64-hpux behaves the same as ia64-linux here, since it is a feature of the IA-64 architecture. HP PA-RISC only has one stack as far as I know. The hppa hpux problems are probably unrelated to the IA-64 problems. >3) I'd appreciate your comments on the patch below if possible. It looks reasonable. I've avoiding learning too much about this part of the IA-64 architecture, so i can't say for sure whether it is completely right. The __libc_ia64_register_backing_store_base reference might be glibc and hence linux specific. I don't think the ABI requires that the variable be present. Thus you might need different mechanisms here for other IA-64 operating systems like HPUX, MS Windows, FreeBSD, etc. Jim
