[PATCH v3 1/4] [SPARC] Errata workaround for GRLIB-TN-0012

[Eric Botcazou]

> 2017-11-17  Daniel Cederman  <cederman@gaisler.com>
> 
> 	* config/sparc/sparc.c (fpop_insn_p): New function.
> 	(sparc_do_work_around_errata): Insert NOP instructions to
> 	prevent sequences that could trigger the TN-0012 errata for
> 	GR712RC.
> 	(pass_work_around_errata::gate): Also test sparc_fix_gr712rc.
> 	* config/sparc/sparc.md (fix_gr712rc): New attribute.
> 	(in_branch_annul_delay): Prevent floating-point instructions
> 	in delay slot of annulled integer branch.

OK for mainline and 7 branch, thanks.

-- 
Eric Botcazou