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Richard Biener ef537cc859 re PR middle-end/67662 (-fsanitize=undefined cries wolf for X - 1 + X when X is 2**30)
2015-09-23   Richard Biener  <rguenther@suse.de>

	PR middle-end/67662
	* fold-const.c (fold_binary_loc): Do not reassociate two vars with
	undefined overflow unless they will cancel out.

	* gcc.dg/ubsan/pr67662.c: New testcase.

From-SVN: r228051
2015-09-23 14:09:48 +00:00
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gcc re PR middle-end/67662 (-fsanitize=undefined cries wolf for X - 1 + X when X is 2**30) 2015-09-23 14:09:48 +00:00
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