[Bug math/20255] New: [i386] fdim, fdimf return with excess range and precision / double rounding

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

https://sourceware.org/bugzilla/show_bug.cgi?id=20255

            Bug ID: 20255
           Summary: [i386] fdim, fdimf return with excess range and
                    precision / double rounding
           Product: glibc
           Version: 2.23
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: jsm28 at gcc dot gnu.org
  Target Milestone: ---
              Host: i?86-*-*

The i386 versions of fdim and fdimf return immediately after doing a
subtraction, so potentially returning a result with excess range and precision
(and with double rounding in the case of fdim if the caller reduces to the
range and precision of the type; for fdimf, the precision is high enough that
double rounding issues do not occur).

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