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./: PR tree-optimization/31605 * tree-vrp.c (set_value_range): Check that min and max are not both overflow infinities. (set_value_range_to_value): New static function. (extract_range_from_binary_expr): Call set_value_range_to_value. (extract_range_from_cond_expr): Likewise. (extract_range_from_expr): Likewise. (extract_range_from_unary_expr): Likewise. Don't create a range which overflows on both sides. (vrp_meet): Check for a useless range. (vrp_visit_phi_node): If we see a constant which looks like an overflow infinity, turn off the TREE_OVERFLOW flag. testsuite/: PR tree-optimizatoin/31605 * gcc.c-torture/execute/pr31605.c: New test. From-SVN: r124128
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