[Snipped from Debian's gcc-3.3_3.3.6-10]

# DP: Fix PR rtl-optimization/23241

http://gcc.gnu.org/ml/gcc-patches/2005-08/msg00446.html

*** a/gcc/combine.c	18 Jan 2005 08:39:05 -0000	1.325.2.19
--- b/gcc/combine.c	5 Aug 2005 18:50:13 -0000
*************** simplify_comparison (code, pop0, pop1)
*** 10863,10869 ****
  		      /* (A - C1) always sign-extends, like C2.  */
  		      && num_sign_bit_copies (a, inner_mode)
  			 > (unsigned int) (GET_MODE_BITSIZE (inner_mode)
! 					   - mode_width - 1)))
  		{
  		  op0 = SUBREG_REG (op0);
  		  continue;
--- 10863,10869 ----
  		      /* (A - C1) always sign-extends, like C2.  */
  		      && num_sign_bit_copies (a, inner_mode)
  			 > (unsigned int) (GET_MODE_BITSIZE (inner_mode)
! 					   - (mode_width - 1))))
  		{
  		  op0 = SUBREG_REG (op0);
  		  continue;