Doing pdp11 cc0->CC conversion, running into ICE related to compare-elim

[Jakub Jelinek]

On Fri, Jun 01, 2018 at 02:49:51PM -0400, Paul Koning wrote:
> Given that the starting insn had a post_inc in it, what would be a proper
> parallel...  construct?  If the post_inc only appears in one of the two
> mentions of the source operatnd, then the match_dup is going to fail.  I
> suppose I can disallow pre and post_inc addressing modes, but that would
> be a lost optimization opportunity.

E.g. compare-elim could punt on instructions with the auto-incs.

	Jakub