On Mon, Jan 9, 2023 at 7:34 PM Takayuki 'January June' Suwa <jjsuwa_sys3...@yahoo.co.jp> wrote: > > Until now, we applied COSTS_N_INSNS() (multiplying by 4) after dividing > the instruction length by 3, so we couldn't express the difference less > than modulo 3 in insn cost for size (e.g. 11 Bytes and 12 bytes cost the > same). > > This patch fixes that. > > ;; 2 bytes > addi.n a2, a2, -1 ; cost 3 > > ;; 3 bytes > addmi a2, a2, 1024 ; cost 4 > > ;; 4 bytes > movi.n a3, 80 ; cost 5 > bnez.n a2, a3, .L4 > > ;; 5 bytes > srli a2, a3, 1 ; cost 7 > add.n a2, a2, a2 > > ;; 6 bytes > ssai 8 ; cost 8 > src a4, a2, a3 > > :: 3 + 4 bytes > l32r a2, .L5 ; cost 9 > > ;; 11 bytes ; cost 15 > ;; 12 bytes ; cost 16 > > gcc/ChangeLog: > > * config/xtensa/xtensa.cc (xtensa_insn_cost): > Let insn cost for size be obtained by applying COSTS_N_INSNS() > to instruction length and then dividing by 3. > --- > gcc/config/xtensa/xtensa.cc | 11 +++++++---- > 1 file changed, 7 insertions(+), 4 deletions(-)
Regtested for target=xtensa-linux-uclibc, no new regressions. Committed to master. -- Thanks. -- Max