cab411a2b4
Now that nonzero bits are first class citizens in the range, we can keep better track of them in range-ops, especially the bitwise and operator. This patch sets the nonzero mask for the trivial case. In doing so, I've removed some old dead code that was an attempt to keep better track of masks. I'm sure there are tons of optimizations throughout range-ops that could be implemented, especially the op1_range methods, but those always make my head hurt. I'll leave them to the smarter hackers out there. I've removed the restriction that nonzero bits can't be queried from legacy. This was causing special casing all over the place, and it's not like we can generate incorrect code. We just silently drop nonzero bits to -1 in some of the legacy code. The end result is that VRP1, and other users of legacy, may not benefit from these improvements. Tested and benchmarked on x86-64 Linux. gcc/ChangeLog: * range-op.cc (unsigned_singleton_p): Remove. (operator_bitwise_and::remove_impossible_ranges): Remove. (operator_bitwise_and::fold_range): Set nonzero bits. * * value-range.cc (irange::get_nonzero_bits): Remove legacy_mode_p assert. (irange::dump_bitmasks): Remove legacy_mode_p check. |
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