gcc/ChangeLog:

2016-07-29  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR middle-end/68217
	* tree-vrp.c (extract_range_from_binary_expr_1): In case of signed
	& sign-bit-CST, generate [-INF, 0] instead of [-INF, INF].


gcc/testsuite/ChangeLog:

2016-07-29  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR middle-end/68217
	* gcc.dg/pr68217.c: New test.

From-SVN: r238846