https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108248
--- Comment #3 from Andrew Waterman <andrew at sifive dot com> --- Yikes. Thanks for the explanation, Jeff. (cc Kito Cheng: at some point, we should revisit the pipeline modeling of Zb* instructions for sifive-7. The short version is that all Zb* instructions can execute on the B pipe. The A pipe supports only a subset: rev8, bext[i], addu.w, slliu.w, sext.*, zext.*, orn, xnor, andn. So, to do an accurate job, we'll need finer granularity than simply describing them all as "bitmanip".)
