Bug 1785: fix pround on x86 to use the same rounding mode as std::round. This also adds pset1frombits helper to Packet[24]d. Makes round ~45% slower for SSE: 1.65µs ± 1% before vs 2.45µs ± 2% after, stil an order of magnitude faster than scalar version: 33.8µs ± 2%.
Eigen is a C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms.
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