Hi,
This patch adds a test for PR57206.  The issue itself is long fixed by patch to PR48052.

Test on x86_64.  It's an obvious change, applied on trunk.

Thanks
bin

gcc/testsuite/ChangeLog
2016-05-04  Bin Cheng  <bin.cheng@arm.com>

	PR tree-optimization/57206
	* gcc.dg/vect/pr57206.c: New test.