On Tue, Dec 06, 2016 at 03:10:50PM +0000, Wilco Dijkstra wrote: > > > ping
I haven't seen a follow-up to Andrew's point regarding other read-modify-write operations. Did youi investigate the cost of these? James > > > From: Wilco Dijkstra > Sent: 25 October 2016 18:08 > To: GCC Patches > Cc: nd > Subject: [PATCH][AArch64] Improve SHA1 scheduling > > SHA1H instructions may be scheduled after a SHA1C instruction > that uses the same input register. However SHA1C updates its input, > so if SHA1H is scheduled after it, it requires an extra move. > Increase the priority of SHA1H to ensure it gets scheduled > earlier, avoiding the move. > > Is this something the generic scheduler could do automatically for > instructions with RMW operands? > > Passes bootstrap & regress. OK for commit? > > ChangeLog: > 2016-10-25 Wilco Dijkstra <wdijk...@arm.com> > > * config/aarch64/aarch64.c (aarch64_sched_adjust_priority) > New function. > (TARGET_SCHED_ADJUST_PRIORITY): Define target hook.
