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

[wilco at gcc dot gnu.org]

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.