r158265 - in /trunk/gcc: ChangeLog testsuite/Ch...

[matz@gcc.gnu.org]

Author: matz
Date: Tue Apr 13 12:39:53 2010
New Revision: 158265

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=158265
Log:
	* tree-ssa-reassoc.c (repropagate_negates): Merge negates also
	into MINUS_EXPRs.
	(can_reassociate_p): New function.
	(break_up_subtract_bb, reassociate_bb): Use it.

testsuite/
	* gcc.dg/tree-ssa/negate.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/negate.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-reassoc.c