passes.c: Add bswap pass.

passes.c: Add bswap pass.

2009-06-14  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>

	* passes.c: Add bswap pass.
	* tree-pass.h: Add pass_optimize_bswap declaration.
	* tree-ssa-math-opts.c: Include diagnostics.h for print_gimple_stmt.
	Include rtl.h, expr.h and optabs.h for optab_handler check.
	(struct symbolic_number, pass_optimize_bswap): New definition.
	(do_shift_rotate, verify_symbolic_number_p): New functions.
	(find_bswap_1, find_bswap, execute_optimize_bswap): New functions.
	(gate_optimize_bswap): New function.
	* tree.c (widest_int_cst_value): New function.
	* tree.h (widest_int_cst_value): Prototype added.

2009-06-14  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>

	* gcc.dg/optimize-bswap-1.c: New testcase.

From-SVN: r148471