On 07/25/2016 08:31 PM, Kito Cheng wrote:
Hi Jeff:
Oop, patch in attachment, and I hit this bug in gcc.dg/torture/vshuf-v2di.c
with our nds32 internal branch.
Hi Richard:
I think we really need reg dead note for some optimization, and btw,
here is our split pattern:
So I see a real need to be able to look at those notes -- I think the
big question in my mind is whether or not we want to pay the price for
all the splitter passes or if we can/should restrict it to a subset of
the passes. Note that I think we have 4 distinct passes that call
split_all_insns.
For the H8, we could restrict it to cases where epilogue_completed is
true. I haven't looked closely at the other targets.
I'm pretty sure we do _not_ want it for split_all_insns_noflow since
that's used when the CFG is not necessarily correct and thus I don't see
how we can reliably have death/unused notes.
Jeff
