r124042 - in /trunk/gcc: ChangeLog testsuite/Ch...

[rguenth@gcc.gnu.org]

Author: rguenth
Date: Sun Apr 22 12:26:49 2007
New Revision: 124042

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=124042
Log:
2007-04-22  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/29789
	* tree-ssa-loop-im.c (stmt_cost): Adjust cost of shifts.
	(rewrite_reciprocal): New helper split out from
	determine_invariantness_stmt.
	(rewrite_bittest): Likewise.
	(determine_invariantness_stmt): Rewrite (A >> B) & 1 to
	A & (1 << B) if (1 << B) is loop invariant but (A >> B)
	is not.

	* gcc.dg/tree-ssa/ssa-lim-1.c: New testcase.
	* gcc.dg/tree-ssa/ssa-lim-2.c: Likewise.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-lim-1.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-lim-2.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-loop-im.c