r181257 - in /trunk/gcc: ChangeLog combine.c te...

[jakub@gcc.gnu.org]

Author: jakub
Date: Thu Nov 10 15:36:48 2011
New Revision: 181257

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=181257
Log:
	PR rtl-optimization/51023
	* combine.c (simplify_comparison) <case SIGN_EXTEND>: Don't use
	val_signbit_known_clear_p for signed comparison narrowing
	optimization.  Don't check for non-VOIDmode, use
	HWI_COMPUTABLE_MODE_P macro.
	<case ZERO_EXTEND>: Don't check for non-VOIDmode.
	Optimize even when const_op is equal to GET_MODE_MASK (mode),
	don't optimize if const_op is negative.

	* gcc.c-torture/execute/pr51023.c: New test.

Added:
    trunk/gcc/testsuite/gcc.c-torture/execute/pr51023.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/combine.c
    trunk/gcc/testsuite/ChangeLog