r115924 - in /trunk/gcc: ChangeLog cse.c

[danglin@gcc.gnu.org]

Author: danglin
Date: Fri Aug  4 14:15:37 2006
New Revision: 115924

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=115924
Log:
	PR rtl-optimization/26244
	* cse.c (fold_rtx): Correctly associate shifts when const_arg1 and/or
	inner_const are negative or greater than or equal to the bitsize of
	MODE.  If SHIFT_COUNT_TRUNCATED is false, the values aren't associated.
	Otherwise, the values are masked using GET_MODE_BITSIZE (mode) - 1.
	Simplify complicated if statement.  For ASHIFT and LSHIFTRT, return
	CONST0_RTX (mode) when the new shift count is greater than or equal to
	to the bitsize of the object being shifted and XEXP (y, 0) has no side
	effects.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/cse.c