https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112092
--- Comment #6 from JuzheZhong <juzhe.zhong at rivai dot ai> --- > I have troubles chasing one down and the source code is so > convoluted with macros I can't even find the implementation. I am sorry for causing confusion to you here. But because of the RVV fusion rules are so complicated, we define it in riscv-vsetvl.def. To understand the codes, I suggest you directly read the riscv-vsetvl.def We define all compatible, fusion, available rules there. For example, vle16.v (e16, m1 ) is compatible with vadd.vv (e32, mf2 ), In this case, adjacent 2 instructions "vle16" (e16m1) and vadd.vv (e32mf2) can have the same vsetvl (vsetvl e32mf2). Wheras vsub.vv(e16,m1) and vadd (e32 mf2), they are not compatible.
