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approximate 1/sqrt(x) and sqrt(x) with goldschmidt iterations.
this is known to be a fast method for computing sqrt, but it is
tricky to get right, so added detailed comments.
use a lookup table for the initial estimate, this adds 256bytes
rodata but it can be shared between sqrt, sqrtf and sqrtl.
this saves one iteration compared to a linear estimate.
this is for soft float targets, but it supports fenv by using a
floating-point operation to get the final result. the result
is correctly rounded in all rounding modes. if fenv support is
turned off then the nearest rounded result is computed and
inexact exception is not signaled.
assumes fast 32bit integer arithmetics and 32 to 64bit mul.
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prior to this change, the canonical name came from the first hosts
file line matching the requested family, so the canonical name for a
given hostname could differ depending on whether it was requested with
AF_UNSPEC or a particular family (AF_INET or AF_INET6). now, the
canonical name is deterministically the first one to appear with the
requested name as an alias.
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the existing code clobbered the canonical name already discovered
every time another matching line was found, which will necessarily be
the case when a hostname has both IPv4 and v6 definitions.
patch by Wolf.
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