Model the divider in Lujiazui processors as a separate automaton to
significantly reduce the overall model size. This should also result
in improved accuracy, as pipe 0 should be able to accept new
instructions while the divider is occupied.
It is unclear why integer divisions are modeled as if pipes 0-3 are all
occupied. I've opted to keep a single-cycle reservation of all four
pipes together, so GCC should continue trying to pack instructions
around a division accordingly.
Currently top three symbols in insn-automata.o are:
106102 r lujiazui_core_check
106102 r lujiazui_core_transitions
196123 r lujiazui_core_min_issue_delay
This patch shrinks all lujiazui tables to:
3 r lujiazui_decoder_min_issue_delay
20 r lujiazui_decoder_transitions
32 r lujiazui_agu_min_issue_delay
126 r lujiazui_agu_transitions
304 r lujiazui_div_base
352 r lujiazui_div_check
352 r lujiazui_div_transitions
1152 r lujiazui_core_min_issue_delay
1592 r lujiazui_agu_translate
1592 r lujiazui_core_translate
1592 r lujiazui_decoder_translate
1592 r lujiazui_div_translate
3952 r lujiazui_div_min_issue_delay
9216 r lujiazui_core_transitions
This continues the work on reducing i386 insn-automata.o size started
with similar fixes for division and multiplication instructions in
znver.md.