Ilya Tokar 06e99aaf40 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%.

2019-12-12 17:38:53 -05:00

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