[Bug target/86236] Stack alignment prologue clobbers %edi for fastcall functions with global register variable

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86236

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-11-20
                 CC|                            |xuepeng.guo at intel dot com
     Ever confirmed|0                           |1

--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Jakub Jelinek from comment #4)
> H.J., any thoughts on this?  Can we try to pick other regs if %edi is taken
> (if there are any left, I'm afraid often there won't be any) or should we
> just error out?

We need to fix find_drap_reg to check for fixed registers.  If we can't
find a register, we should issue an error.