[Xapian-tickets] [Xapian] #321: build_numeric_ranges sometimes builds invalid ranges

[Xapian]

#321: build_numeric_ranges sometimes builds invalid ranges
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 Reporter:  shane        |        Owner:  olly     
     Type:  defect       |       Status:  new      
 Priority:  normal       |    Milestone:           
Component:  Library API  |      Version:  SVN trunk
 Severity:  normal       |   Resolution:           
 Keywords:               |    Blockedby:           
 Platform:  All          |     Blocking:           
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Comment(by shane):

 Ah, ok, I understand why you're rounding down.

 It seems that sometimes start > lo due to fp rounding.

 In my example, I have:[[BR]]
 lo = 11.949999999999999289457264239899814128875732421875[[BR]]
 unit = 0.01000000000000000020816681711721685132943093776702880859375[[BR]]
 and get:[[BR]]
 start = 11.9500000000000010658141036401502788066864013671875[[BR]]

 This also happens on Opteron.

 I guess the solution is:
 {{{
 #!cpp
 if (start > lo) start = lo;
 }}}

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Ticket URL: <http://trac.xapian.org/ticket/321#comment:3>
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