re PR rtl-optimization/42589 (bswap optimization does not work for 32bit (but for 64bit) on 64bit registers)

2010-01-03  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/42589
	* tree-ssa-math-opts.c (execute_optimize_bswap): Allow
	double-word expansion of bswap32.

	* gcc.target/i386/pr42589.c: New testcase.

From-SVN: r155588