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[Bug math/18595] New: ctan, ctanh missing underflows


https://sourceware.org/bugzilla/show_bug.cgi?id=18595

            Bug ID: 18595
           Summary: ctan, ctanh missing underflows
           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: ---

ctan and ctanh fail to raise underflow exceptions for some cases that should
underflow, e.g. for float on x86_64:

Failure: Real part of: ctan (-0x8p-152 + +0 i): Exception "Underflow" not set
Failure: Real part of: ctanh (+0 - 0x8p-152 i): Exception "Underflow" not set

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