re PR tree-optimization/14847 ([tree-ssa] combine "if (a & 1) goto there" and "if (a & 4) goto there")

2008-04-30  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/14847
	* tree-ssa-ifcombine.c (get_name_for_bit_test): New helper function.
	(recognize_bits_test): Use it.
	(recognize_single_bit_test): Likewise.

	* gcc.dg/tree-ssa/ssa-ifcombine-6.c: New testcase.

From-SVN: r134825