re PR sanitizer/81148 (UBSAN: two more false positives)
2017-08-03 Richard Biener <rguenther@suse.de> PR middle-end/81148 * fold-const.c (split_tree): Add minus_var and minus_con arguments, remove unused loc arg. Never generate NEGATE_EXPRs here but always use minus_*. (associate_trees): Assert we never associate with MINUS_EXPR and NULL first operand. Do not recurse for PLUS_EXPR operands when associating as MINUS_EXPR either. (fold_binary_loc): Track minus_var and minus_con. * c-c++-common/ubsan/pr81148.c: New testcase. From-SVN: r250853
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gcc/testsuite/c-c++-common/ubsan/pr81148.c
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