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Now that we have generic ranges, we need a way to define generic local temporaries on the stack for intermediate calculations in the ranger and elsewhere. We need temporaries analogous to int_range_max, but for any of the supported types (currently just integers, but soon integers, pointers, and floats). The Value_Range object is such a temporary. It is designed to be transparently used as a vrange. It shares vrange's abstract API, and implicitly casts itself to a vrange when passed around. The ultimate name will be value_range, but we need to remove legacy first for that to happen. Until then, Value_Range will do. Sample usage is as follows. Instead of: extern void foo (vrange &); int_range_max t; t.set_nonzero (type); foo (t); one does: Value_Range t (type); t.set_nonzero (type); foo (t); You can also delay initialization, for use in loops for example: Value_Range t; ... t.set_type (type); t.set_varying (type); Creating an supported range type, will result in an unsupported_range object being created, which will trap if anything but set_undefined() and undefined_p() are called on it. There's no size penalty for the unsupported_range, since its immutable and can be shared across instances. Since supports_type_p() is called at construction time for each temporary, I've removed the non-zero check from this function, which was mostly unneeded. I fixed the handful of callers that were passing null types, and in the process sped things up a bit. As more range types come about, the Value_Range class will be augmented to support them by adding the relevant bits in the initialization code, etc. Tested on x86-64 & ppc64le Linux. gcc/ChangeLog: * gimple-range-fold.h (gimple_range_type): Check type before calling supports_type_p. * gimple-range-path.cc (path_range_query::range_of_stmt): Same. * value-query.cc (range_query::get_tree_range): Same. * value-range.cc (Value_Range::lower_bound): New. (Value_Range::upper_bound): New. (Value_Range::dump): New. * value-range.h (class Value_Range): New. (irange::supports_type_p): Do not check if type is non-zero.
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