LRA reload produces invalid insn

[Peter Bergner]

On 11/1/18 7:25 PM, Paul Koning wrote:
> I'm running the testsuite on the pdp11 target, and I get a failure when using LRA that works correctly with the old allocator.  The issue is that LRA is producing an insn that is invalid (it violates the constraints stated in the insn definition).
[snip]
> which is the correct sequence given the matching operand constraint in the define_insn.
> 
> Is this an LRA bug, or is there something I need to do in the target to prevent this happening?

What do you mean by "old allocator"?  Just an older revision?  Does it work before my
revision 264897 commit and broken after?  If so, could you try the following to see
whether that fixes things for you?

    https://gcc.gnu.org/ml/gcc-patches/2018-10/msg01757.html

My commit above exposed some latent LRA bugs and my patch above tries
to fix issues similar to what you're seeing.

Peter