I'm thinking about adding a "-mabi=" option to change the call ABI. Currently, objects larger than 64 bits in the 32-bit runtime are passed by reference and the callee copies the object when necessary. This is opposite to x86 where the caller does the copies. Most targets are caller copies. The problem with callee copies is that it doesn't work with openmp. There are race problems and sometimes we get internal compiler errors with openmp code due to this problem. This became apparent when new testcases were added to gcc-6. It's tough to fix this problem in gcc. This is gcc PR: <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68733>. This is fixed if we change abi to caller copies (maybe "-mabi=gnu" and "-mabi=hp"). The default could be set by a configure options. Probably, we would want the new gnu abi on linux as the default. However, there is the potential to break stuff during the migration to the new abi. Opinions? Dave -- John David Anglin dave.anglin@xxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-parisc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
