Heikki Linnakangas <hlinn...@iki.fi> writes:
> Unfortunately, sqrt(x) isn't very cheap.

You'd be surprised: sqrt is built-in on most modern hardware.  On my
three-year-old workstation, sqrt(x) seems to take about 2.6ns.  For
comparison, the pack_float version posted in
takes 3.9ns (and draws multiple compiler warnings, too).

                        regards, tom lane

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