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The wide-int.h templates expect that when an int/long etc. operand is used it will be sign-extended based on the types precision. wi_fold_in_parts passes 3 such non-zero constants to wi::lt_p, wi::gt_p and wi::eq_p - 1, 3 and 4, which means it was doing weird things if either some of 1, 3 or 4 weren't representable in type, or if type was unsigned 3 bit type 4 should be written as -4. The following patch promotes the subtraction operands to widest_int and uses that as the type for ?h_range variables and compares them as such. We don't need the overflow handling because there is never an overflow. 2022-02-02 Jakub Jelinek <jakub@redhat.com> PR tree-optimization/104334 * range-op.cc (range_operator::wi_fold_in_parts): Change lh_range and rh_range type to widest_int and subtract in widest_int. Remove ov_rh, ov_lh and sign vars, always perform comparisons as signed and use >, < and == operators for it. * g++.dg/opt/pr104334.C: New test.
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