[Bug math/2466] New: Errors in long double (ldbl-128ibm) llrounding functions in glibc-2.4

["sjmunroe at us dot ibm dot com" <sourceware-bugzilla at sourceware dot org>]

The implementations of the (IBM double double format) long double
(./ldbld-128ibm/) for llrintl and llroundl, round incorrectly
when the integer portion is contained in th ehigh double, but the fractional
postion is contained in the low double. There are also problems where the input
value approaches __LONG_LONG_MAX__.

Also the IEEE 1003.1 spec states "These functions shall round their argument to
the nearest integer value, rounding according to the current rounding
direction."  So I added tests to libm-test.inc to cover llrint in four rounding
modes (FE_TONEAREST, FE_TOWARDZERO, FE_UPWARD, FE_DOWNWARD) in addition to the
default rounding.

-- 
           Summary: Errors in long double (ldbl-128ibm) llrounding functions
                    in glibc-2.4
           Product: glibc
           Version: 2.4
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
        AssignedTo: aj at suse dot de
        ReportedBy: sjmunroe at us dot ibm dot com
                CC: glibc-bugs at sources dot redhat dot com
 GCC build triplet: powerpc-gnu-linux
  GCC host triplet: powerpc-gnu-linux
GCC target triplet: powerpc-gnu-linux


http://sourceware.org/bugzilla/show_bug.cgi?id=2466

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