> 2023年2月28日 19:21，Nathan Chancellor <nathan@xxxxxxxxxx> 写道： > > On Tue, Feb 28, 2023 at 11:19:17AM +0000, Jiaxun Yang wrote: >> Clang is unable to handle the situation that a chunk of inline >> assembly ends with a compat branch instruction and then compiler >> generates another control transfer instruction immediately after >> this compat branch. The later instruction will end up in forbidden >> slot and cause exception. >> >> Workaround by add a option to control the use of compact branch. >> Currently it's selected by CC_IS_CLANG and hopefully we can change >> it to a version check in future if clang manages to fix it. >> >> Fix boot on boston board. >> >> Link: https://github.com/llvm/llvm-project/issues/61045 >> Signed-off-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx> > > Thanks for filing that bug and debugging this. I came across a post from > the (now former) MIPS code owner and I am not sure anyone else has > stepped up, the vast majority of commits to llvm/lib/Targets/Mips have > been either NFC commits or treewide refactorings, so it will be > interesting to see if we can get that fixed. Yunqiang Su <syq@xxxxxxxxxx>[1] said he will take a look on that issue. > > https://discourse.llvm.org/t/mips-backend-code-owner/60737 > https://github.com/llvm/llvm-project/commit/7daed359111f6d151fef447f520f85ef1dabedf6 > > For now: > > Acked-by: Nathan Chancellor <nathan@xxxxxxxxxx> > > If a v3 is necessary for some reason, a link to that issue in the source > itself would be useful, as we can easily grep for 'llvm/llvm-project' to > audit issues; I am not sure it is worth sending a v3 just for that alone > though. Will do a v3, it also helps me document the actual issue. Thanks [1]: https://reviews.llvm.org/p/wzssyqa/ - Jiaxun >
