4c8c373495
In r10-4803-g8489e1f45b50600c I'd used POINTER_DIFF_EXPR to subtract the two pointers involved in an overlap test. I'm not sure whether I'd specifically chosen that over MINUS_EXPR or not; if so, the only reason I can think of is that it is probably faster on targets with PSImode pointers. Regardless, as the PR points out, subtracting unrelated pointers using POINTER_DIFF_EXPR is undefined behaviour. gcc/ PR tree-optimization/119399 * tree-data-ref.cc (create_waw_or_war_checks): Use a MINUS_EXPR on two converted pointers, rather than converting a POINTER_DIFF_EXPR on the pointers. gcc/testsuite/ PR tree-optimization/119399 * gcc.dg/vect/pr119399.c: New test. |
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