[Bug target/85769] [8/9 Regression] ICE in extract_constrain_insn, at recog.c:2205 for -mcpu=thunderx

[tnfchris at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85769

--- Comment #2 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
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.