memory is not free

[Richard Henderson]

On Wed, Dec 01, 1999 at 12:09:50AM -0800, Alex Samuel wrote:
> ! 	    case 'e': case 'u':
> ! 	      exp = XEXP (r, i);
> ! 	      if (ggc_test_and_set_mark (exp))
> ! 		{ 
> ! 		  if (next_rtx == NULL) 
> ! 		    next_rtx = exp; 
> ! 		  else 
> ! 		    ggc_mark_rtx_children (exp);
> ! 		} 

We might want to special-case the instruction rtxes.  I would imagine
that we could keep the nesting depth significantly lower by forcing
NEXT_INSN to be the rtx we optimize for the tail call.



r~