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[Bug math/3919] New: Quiet NaNs not propagated quietly by some math functions


I've conducted a survey of the qNaN propagation of all C99 <math.h> functions on
i386 and found the following nonconformances:

- The acosh and acoshf functions raise the invalid exception flag if their
  argument is a quiet NaN. (The acoshl function does not do that.)

- The log, logf, and logl functions raise the invalid exception flag if
  their argument is a quiet NaN.

- The ilogb, ilogbf, and ilogbl raise the invalid exception flag if their
  argument is a quiet NaN. According to C99, they should compute
  P_ILOGBNAN. They do not appear to be required to raise a domain error
  and I have doublts this is in accordance with the spirit of IEEE754.

-- 
           Summary: Quiet NaNs not propagated quietly by some math functions
           Product: glibc
           Version: 2.4
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
        AssignedTo: aj at suse dot de
        ReportedBy: kreckel at ginac dot de
                CC: glibc-bugs at sources dot redhat dot com
  GCC host triplet: i686-pc-linux-gnu


http://sourceware.org/bugzilla/show_bug.cgi?id=3919

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