r116827 - in /trunk/gcc: ChangeLog combine.c te...

[ebotcazou@gcc.gnu.org]

Author: ebotcazou
Date: Sun Sep 10 21:27:36 2006
New Revision: 116827

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=116827
Log:
	PR rtl-optimization/28636
	* combine.c (force_to_mode): Test for side-effects before
	substituting by zero.
	(simplify_shift_const): Likewise for zero or other constants.


Added:
    trunk/gcc/testsuite/gcc.c-torture/execute/20060910-1.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/combine.c
    trunk/gcc/testsuite/ChangeLog