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[Bug math/16521] New: Missing underflow exception from exp2


https://sourceware.org/bugzilla/show_bug.cgi?id=16521

            Bug ID: 16521
           Summary: Missing underflow exception from exp2
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: zimmerma+gcc at loria dot fr

Created attachment 7386
  --> https://sourceware.org/bugzilla/attachment.cgi?id=7386&action=edit
test program

on x86_64 I get with the attached program:

GNU libc version: 2.18.90
GNU libc release: development
x=-0x1.f8002ep+6 (-1.260001754e+02)
libc: exp2f(x)=0x1.fff01p-127 (1.175351419e-38) underflow=0
mpfr: exp2f(x)=0x1.fff01p-127 (1.175351419e-38)
ulp difference: 0.000000

Since the result 0x1.fff01p-127 is below the smallest normal number 1p-126, we
should have an underflow exception.

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