https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112433
--- Comment #2 from JuzheZhong <juzhe.zhong at rivai dot ai> --- (In reply to Kito Cheng from comment #1) > Give few more background why LLVM must do that way: LLVM can't allocate new > pseudo register during register allocation process, however spilling vector > register with specific length may require scratch register to setting the VL. > > And the benefit of more exactly live range for GPR is kind of by-products > which we didn't aware during the discussion stage :P Yes. I was aware of this long time ago that's why our internal rewrite VSETVL PASS is still running before RA.
