https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85769
Wilco <wilco at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |wilco at gcc dot gnu.org --- Comment #3 from Wilco <wilco at gcc dot gnu.org> --- (In reply to Tamar Christina from comment #2) > It's not r250673, That was committed 2017-07-28 and a GCC built 2017-08-17 > does the correct thing for non-Armv8.2-a. It promotes the fp16 values to 32 > bits does the operations and converts them back to fp16. > > somewhere along the line something has decided to no longer do this. I can > fix the ICE by adding the missing pattern explicitly, but it should have not > generated this insn to begin with. Yes it looks like a reload bug - choosing an alternative without checking it is valid.