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The following addresses IVOPTs rewriting expressions in its strip_offset without caring for definedness of overflow. Rather than the earlier attempt of just using the proper split_constant_offset from data-ref analysis the following adjusts IVOPTs helper trying to minimize changes from this fix, possibly easing backports. PR tree-optimization/110243 PR tree-optimization/111336 * tree-ssa-loop-ivopts.cc (strip_offset_1): Rewrite operations with undefined behavior on overflow to unsigned arithmetic. * gcc.dg/torture/pr110243.c: New testcase. * gcc.dg/torture/pr111336.c: Likewise. |
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