It is documented.  ping(8) (3:20101006-1ubuntu1 from 12.04LTS) says:
|       If the data space is at least of size of struct timeval ping  uses  the
|       beginning  bytes  of this space to include a timestamp which it uses in
|       the computation of round trip times.  If the data space is shorter,  no
|       round trip times are given.

** Changed in: iputils (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1004350

Title:
  Ping does not show roundtrip time (64bit issue)

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