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When shifting outside the valid range of [0, precision-1], we can choose to process just the valid ones since the rest is undefined. this allows us to produce results for x << [0,2][+INF, +INF] by discarding the invalid ranges and processing just [0,2]. gcc/ PR tree-optimization/93781 * range-op.cc (get_shift_range): Rename from undefined_shift_range_check and now return valid shift ranges. (operator_lshift::fold_range): Use result from get_shift_range. (operator_rshift::fold_range): Ditto. gcc/testsuite/ * gcc.dg/tree-ssa/pr93781-1.c: New. * gcc.dg/tree-ssa/pr93781-2.c: New. * gcc.dg/tree-ssa/pr93781-3.c: New.
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