[Bug math/13841] New: csqrt overflow and underflow

[jsm28 at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=13841

             Bug #: 13841
           Summary: csqrt overflow and underflow
           Product: glibc
           Version: 2.15
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
        AssignedTo: jsm28@gcc.gnu.org
        ReportedBy: jsm28@gcc.gnu.org
    Classification: Unclassified


The use of hypot in csqrt means it suffers from overflow and underflow in
internal calculations.  On x86_64, csqrt (DBL_MAX + DBL_MAX * I) wrongly
returns inf + 0 * I; for 0x1p-1074 + 0x1p-1074 * I, the result is 0 + NaN * I. 
I'll send a patch.

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