On Mon, Jul 01, 2019 at 04:27:05PM -0500, Segher Boessenkool wrote: > The entry before the 8 is split as well. Maybe that should be "4", to > stand out? I don't know what works better; your choice.
I'll look into it. Note, the length is used in two places. One at the end to generate the appropriate branches, but the other is in rs6000_insn_cost inside rs6000.c. This occurs before the final passes, so it is important that even though the insn will be split, that the length is still set. However, things are rather inconsistant, in that sometimes the length field is accurate, and sometimes not. I'm finding that the rs6000_insn_cost issue really muddies things up, particularly if a vector load/store insn is done in gpr registers, where it can be 4 insns. -- Michael Meissner, IBM IBM, M/S 2506R, 550 King Street, Littleton, MA 01460-6245, USA email: meiss...@linux.ibm.com, phone: +1 (978) 899-4797
