[Bug math/18593] New: csin, csinh bad overflow results in directed rounding modes

["jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18593

            Bug ID: 18593
           Summary: csin, csinh bad overflow results in directed rounding
                    modes
           Product: glibc
           Version: 2.21
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: jsm28 at gcc dot gnu.org
  Target Milestone: ---

csin and csinh can produce bad results when overflowing in directed rounding
modes.  E.g., for float on x86_64:

Failure: Test: Real part of: csin_downward (-0xcp-4 - 0x2.c5d4p+12 i)
Result:
 is:         -3.40282346638528859812e+38  -0x1.fffffe00000000000000p+127
 should be:  -inf  -inf

Failure: Test: Real part of: csinh_downward (-0x2.c5d4p+12 - 0xcp-4 i)
Result:
 is:         -3.40282346638528859812e+38  -0x1.fffffe00000000000000p+127
 should be:  -inf  -inf

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