> 2023年4月21日 11:48，Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx> 写道： > > On Sun, Apr 09, 2023 at 11:43:06AM +0100, Jiaxun Yang wrote: >> parse_r helper is used to parse register number from oprand, >> it only handles oprand which use number to refer register before. >> >> However compiler may use $gp and $sp to reference register 29 and >> 30. Handle this situation by adding relevant match name. > > are you sure the compiler is doing that ? Which compiler is this ? > To me this feels more like missing #defines from asm/regdef.h for > some inline assembly stuff... Yes, clang is doing that, see[1]. There is no inline assembly mentioning $fp for cfcmsa but clang is still generating $fp for cfcmsa. I was able to reproduce this by dumping assembly generated by clang, but I’m unable to reproduce it for now, it seems like clang will only allocate $fp in rare cases. [1]: https://lore.kernel.org/all/202210180436.ruWBhXRe-lkp@xxxxxxxxx/ Thanks - Jiaxun > > Thomas. > > -- > Crap can work. Given enough thrust pigs will fly, but it's not necessarily a > good idea. [ RFC1925, 2.3 ]
