Re: BOOTSTRAP FAILURE: segementation fault in genattrtab under hpux

["John David Anglin" <dave at hiauly1 dot hia dot nrc dot ca>]

> 
> 
>   In message <200011152210.RAA23951@hiauly1.hia.nrc.ca>you write:
>   > > 0xb8af8 <layout_type+64>:       extrw,u r22,7,8,r3
>   > > 0xb8afc <layout_type+68>:       ldo 4c8(r9),r20
>   > > 0xb8b00 <layout_type+72>:       ldb  r20(sr0,r3),rp
>   > > 0xb8b04 <layout_type+76>:       extrw,s rp,31,8,r19
>   > > 0xb8b08 <layout_type+80>:       cmpb,<> r25,r19,0xb9968 <layout_type+3760
>   > >
>   > > 
>   > > (gdb) stepi
>   > > 0xb8b00 1235      if (TYPE_SIZE (type))
>   > > (gdb) info reg r22 r3 r9 r20
>   > > r22 7000000
>   > > r3 7b03abb0
>   > > r9 400050d8
>   > > r20 400055a0
>   > > (gdb) stepi
>   > 
>   > The problem is the base and index registers in the ldb instruction
>   > have been interchanged by rename registers.  These are not interchangeable
>   > on the pa because the space register for the instruction is loaded from
>   > the base register.  Richard and Jeff, any thoughts on how to fix this
>   > one?
> Hmmm, presumably the insn was recognized because reload was completed and
> we didn't expect anyone to be mucking around with this stuff again, but
> regrename mucked things?

I think the reversal occurs because r3 is being used as an index register.
There is stuff in the machine definition like this:

(define_insn ""
  [(set (match_operand:SI 0 "register_operand" "=r")
        (zero_extend:SI (mem:HI
		          (plus:SI
		  	    (match_operand:SI 1 "basereg_operand" "r")
			    (match_operand:SI 2 "register_operand" "r")))))]
  "! TARGET_DISABLE_INDEXING"
  "*
{
  /* Reload can create backwards (relative to cse) unscaled index
     address modes when eliminating registers and possibly for
     pseudos that don't get hard registers.  Deal with it.  */
  if (operands[2] == hard_frame_pointer_rtx
      || operands[2] == stack_pointer_rtx)
    return \"{ldhx|ldh} %1(%2),%0\";
  else
    return \"{ldhx|ldh} %2(%1),%0\";
}"
  [(set_attr "type" "load")
   (set_attr "length" "4")])

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)