[Bug math/22987] New: [powerpc/sparc] fdim inlines errno, exceptions handling

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

https://sourceware.org/bugzilla/show_bug.cgi?id=22987

            Bug ID: 22987
           Summary: [powerpc/sparc] fdim inlines errno, exceptions
                    handling
           Product: glibc
           Version: 2.27
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: jsm28 at gcc dot gnu.org
  Target Milestone: ---

The powerpc and sparc bits/mathinline.h include inlines of fdim and fdimf. 
These are not restricted to -fno-math-errno, but do not set errno, and wrongly
use ordered <= comparisons instead of the required islessequal comparisons
(this latter issue is latent on powerpc because GCC wrongly uses unordered
comparison instructions for operations that should use ordered comparison
instructions).

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