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Right now, range_of_expr only works with constants, SSA names, and pointers. Anything else gets returned as VARYING. This patch adds the capability to deal with arbitrary expressions, inasmuch as these tree codes are implemented in range-ops.cc. This will give us the ability to ask for the range of any tree expression, not just constants and SSA names, with range_of_expr(). This is a more generic implementation of determine_value_range in VRP. A follow-up patch will remove all uses of it in favor of the range_query API. gcc/ChangeLog: * function-tests.c (test_ranges): Call gimple_range_tests. * gimple-range-cache.cc (ranger_cache::range_of_expr): Pass stmt to get_tree_range. * gimple-range.cc (fur_source::get_operand): Do not call get_tree_range or gimple_range_global. get_tree_range. (get_tree_range): Move to value-query.cc. Call get_arith_expr_range. (gimple_ranger::range_of_expr): Add argument to get_tree_range. Include gimple-range-tests.cc. * gimple-range.h (fold_range): Add argument. (get_tree_range): Remove. * selftest.h (gimple_range_tests): New. * value-query.cc (global_range_query::range_of_expr): Add stmt argument. (range_query::get_tree_range): Move from gimple-range.cc. * value-query.h (class range_query): Add get_tree_range and get_arith_expr_range. Make fur_source a friend. * vr-values.c (vr_values::range_of_expr): Pass stmt to get_tree_range. * gimple-range-tests.cc: New file.
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