patch: convert_move

[Aldy Hernandez]

Same stupid problem.  SUBREGs of:

	(subreg:V2SI (reg:DI blah))

and

	(subreg:DI (reg:V2SI blah))

...cause an awful lot of grief further down the road.  They are the 
same size, but do not both fit in one register.  Dumping them out to 
memory fixes the problem.

OK?

2003-06-12  Aldy Hernandez  <aldyh@redhat.com>

	* expr.c (convert_move): When converting simd registers, handle
	the case where the registers are not tieable.

Index: expr.c
===================================================================
RCS file: /cvs/cvsfiles/devo/gcc/expr.c,v
retrieving revision 1.485.4.2
diff -c -p -r1.485.4.2 expr.c
*** expr.c	2003/04/30 21:48:56	1.485.4.2
--- expr.c	2003/06/12 21:05:05
*************** convert_move (to, from, unsignedp)
*** 595,603 ****
   	abort ();

         if (VECTOR_MODE_P (to_mode))
! 	from = simplify_gen_subreg (to_mode, from, GET_MODE (from), 0);
         else
! 	to = simplify_gen_subreg (from_mode, to, GET_MODE (to), 0);

         emit_move_insn (to, from);
         return;
--- 595,633 ----
   	abort ();

         if (VECTOR_MODE_P (to_mode))
! 	{
! 	  if (GET_CODE (to) == REG
! 	      && GET_CODE (from) == REG
! 	      && !MODES_TIEABLE_P (to_mode, from_mode))
! 	    {
! 	      int slen = GET_MODE_SIZE (to_mode);
! 	      rtx mem;
!
! 	      mem = assign_stack_temp (from_mode, slen, 0);
! 	      emit_move_insn (mem, from);
! 	      from = adjust_address (mem, from_mode, 0);
! 	      from = simplify_gen_subreg (to_mode, from, from_mode, 0);
! 	    }
! 	  else
! 	    from = simplify_gen_subreg (to_mode, from, from_mode, 0);
! 	}
         else
! 	{
! 	  if (GET_CODE (to) == REG
! 	      && GET_CODE (from) == REG
! 	      && !MODES_TIEABLE_P (to_mode, from_mode))
! 	    {
! 	      int slen = GET_MODE_SIZE (to_mode);
! 	      rtx mem;
!
! 	      mem = assign_stack_temp (from_mode, slen, 0);
! 	      emit_move_insn (mem, from);
! 	      from = adjust_address (mem, from_mode, 0);
! 	      from = simplify_gen_subreg (to_mode, from, from_mode, 0);
! 	    }
! 	  else
! 	    to = simplify_gen_subreg (from_mode, to, to_mode, 0);
! 	}

         emit_move_insn (to, from);
         return;