Small problem in gen_lowpart_common in emit_rtl.c

[Christian Iseli]

I've had problems when GCC was taking a subword of some larger data.
I have a big endian machine, with a word unit of 8 bits.  I think I've
tracked down the problem to the gen_lowpart_common function in emit_rtl.c
which forgets which particular sub-word we are interested in.  Below is my
proposed fix,

Cheers,
					Christian



*** emit-rtl.c.orig	Mon Aug 11 17:57:06 1997
--- emit-rtl.c	Mon Sep  1 13:53:41 1997
*************** gen_lowpart_common (mode, x)
*** 664,670 ****
  	       || GET_MODE_SIZE (mode) == GET_MODE_UNIT_SIZE (GET_MODE (x))))
      return (GET_MODE (SUBREG_REG (x)) == mode && SUBREG_WORD (x) == 0
  	    ? SUBREG_REG (x)
! 	    : gen_rtx (SUBREG, mode, SUBREG_REG (x), SUBREG_WORD (x)));
    else if (GET_CODE (x) == REG)
      {
        /* If the register is not valid for MODE, return 0.  If we don't
--- 664,670 ----
  	       || GET_MODE_SIZE (mode) == GET_MODE_UNIT_SIZE (GET_MODE (x))))
      return (GET_MODE (SUBREG_REG (x)) == mode && SUBREG_WORD (x) == 0
  	    ? SUBREG_REG (x)
! 	    : gen_rtx (SUBREG, mode, SUBREG_REG (x), SUBREG_WORD (x) + word));
    else if (GET_CODE (x) == REG)
      {
        /* If the register is not valid for MODE, return 0.  If we don't