0c888665df
Integer ranges (irange) currently track known 0 bits. We've wanted to track known 1 bits for some time, and instead of tracking known 0 and known 1's separately, it has been suggested we track a value/mask pair similarly to what we do for CCP and RTL. This patch implements such a thing. With this we now track a VALUE integer which are the known values, and a MASK which tells us which bits contain meaningful information. This allows us to fix a handful of enhancement requests, such as PR107043 and PR107053. There is a 4.48% performance penalty for VRP and 0.42% in overall compilation for this entire patchset. It is expected and in line with the loss incurred when we started tracking known 0 bits. This patch just provides the value/mask tracking support. All the nonzero users (range-op, IPA, CCP, etc), are still using the nonzero nomenclature. For that matter, this patch reimplements the nonzero accessors with the value/mask functionality. In follow-up patches I will enhance these passes to use the value/mask information, and fix the aforementioned PRs. gcc/ChangeLog: * data-streamer-in.cc (streamer_read_value_range): Adjust for value/mask. * data-streamer-out.cc (streamer_write_vrange): Same. * range-op.cc (operator_cast::fold_range): Same. * value-range-pretty-print.cc (vrange_printer::print_irange_bitmasks): Same. * value-range-storage.cc (irange_storage::write_lengths_address): Same. (irange_storage::set_irange): Same. (irange_storage::get_irange): Same. (irange_storage::size): Same. (irange_storage::dump): Same. * value-range-storage.h: Same. * value-range.cc (debug): New. (irange_bitmask::dump): New. (add_vrange): Adjust for value/mask. (irange::operator=): Same. (irange::set): Same. (irange::verify_range): Same. (irange::operator==): Same. (irange::contains_p): Same. (irange::irange_single_pair_union): Same. (irange::union_): Same. (irange::intersect): Same. (irange::invert): Same. (irange::get_nonzero_bits_from_range): Rename to... (irange::get_bitmask_from_range): ...this. (irange::set_range_from_nonzero_bits): Rename to... (irange::set_range_from_bitmask): ...this. (irange::set_nonzero_bits): Rename to... (irange::update_bitmask): ...this. (irange::get_nonzero_bits): Rename to... (irange::get_bitmask): ...this. (irange::intersect_nonzero_bits): Rename to... (irange::intersect_bitmask): ...this. (irange::union_nonzero_bits): Rename to... (irange::union_bitmask): ...this. (irange_bitmask::verify_mask): New. * value-range.h (class irange_bitmask): New. (irange_bitmask::set_unknown): New. (irange_bitmask::unknown_p): New. (irange_bitmask::irange_bitmask): New. (irange_bitmask::get_precision): New. (irange_bitmask::get_nonzero_bits): New. (irange_bitmask::set_nonzero_bits): New. (irange_bitmask::operator==): New. (irange_bitmask::union_): New. (irange_bitmask::intersect): New. (class irange): Friend vrange_printer. (irange::varying_compatible_p): Adjust for bitmask. (irange::set_varying): Same. (irange::set_nonzero): Same. gcc/testsuite/ChangeLog: * gcc.dg/tree-ssa/pr107009.c: Adjust irange dumping for value/mask changes. * gcc.dg/tree-ssa/vrp-unreachable.c: Same. * gcc.dg/tree-ssa/vrp122.c: Same. |
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| c++tools | ||
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