regmove broken

[Andreas Schwab]

This change to regmove.c is broken:

	(fixup_match_1): Remove statement with no effect: "if (0) ;".

This if is really needed, which becomes obvious when looking at the lines
that follow.


1998-01-30  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* regmove.c (fixup_match_1): Undo last change, and add a comment
	explaining this.

*** egcs-980129/gcc/regmove.c.~1~	Fri Jan 30 19:10:00 1998
--- egcs-980129/gcc/regmove.c	Fri Jan 30 19:49:44 1998
*************** fixup_match_1 (insn, set, src, src_subre
*** 1216,1222 ****
  	    }
  	}
      }
!   
  #if defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT)
    else if ((code == PLUS || code == MINUS) && insn_const
  	   && try_auto_increment (p, insn, 0, src, insn_const, 1))
--- 1216,1226 ----
  	    }
  	}
      }
! 
!   /* Don't remove this seemingly useless if, it is needed to pair with the
!      else in the next two conditionally included code blocks.  */
!   if (0)
!     {;}
  #if defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT)
    else if ((code == PLUS || code == MINUS) && insn_const
  	   && try_auto_increment (p, insn, 0, src, insn_const, 1))