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

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

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d0c5d731af73fcd787fb398a34e2431bcb686bd3

commit d0c5d731af73fcd787fb398a34e2431bcb686bd3
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Tue Mar 20 18:35:50 2018 +0000

    Remove powerpc, sparc fdim inlines (bug 22987).

    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).

    Since we wish to avoid such header inlines anyway, leaving it to the
    compiler to inline such standard functions under appropriate
    conditions, this patch fixes those issues by removing the inlines in
    question (and thus removing the sparc bits/mathinline.h header which
    had no other inlines left in it).  I've filed
    <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85003> for adding
    correct fdim inlines to GCC, since the function is simple enough that
    a correct inline is a perfectly reasonable architecture-independent
    optimization with -fno-math-errno and in the absence of implicit
    excess precision.

    Tested with build-many-glibcs.py for all its powerpc and sparc
    configurations.

        [BZ #22987]
        * sysdeps/powerpc/bits/mathinline.h (fdim): Remove inline
        function.
        (fdimf): Likewise.
        * sysdeps/sparc/fpu/bits/mathinline.h: Remove file.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                           |    6 ++++
 sysdeps/powerpc/bits/mathinline.h   |   14 --------
 sysdeps/sparc/fpu/bits/mathinline.h |   57 -----------------------------------
 3 files changed, 6 insertions(+), 71 deletions(-)
 delete mode 100644 sysdeps/sparc/fpu/bits/mathinline.h

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