2012-09-26  Christophe Lyon <christophe.lyon@linaro.org>

	gcc/
	* tree-ssa-math-opts.c (bswap_stats): Add found_16bit field.
	(execute_optimize_bswap): Add support for builtin_bswap16.

	gcc/testsuite/
	* gcc.target/arm/builtin-bswap16-1.c: New testcase.

From-SVN: r191760