[Bug math/17261] [powerpc-nofpu] FE_NOMASK_ENV and FE_NONIEEE_ENV incorrect

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https://sourceware.org/bugzilla/show_bug.cgi?id=17261

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=898c62f488e9c403bbb1a96d06c7a257b047fcbc

commit 898c62f488e9c403bbb1a96d06c7a257b047fcbc
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Tue Aug 12 20:31:54 2014 +0000

    Fix powerpc-nofpu __fe_enabled_env and __fe_nonieee_env (bug 17261).

    On powerpc, floating-point environment macros are defined as pointers
    to constants in the library that contain the bit-patterns of the
    desired environment, instead of being magic constants cast to pointer
    type.

    For soft-float, the bit-patterns used for fenv_t are not laid out the
    same as for hard-float.  (e500 has a third layout used; that's not an
    ABI issue because these values are only meaningful within a single
    process, all of whose glibc libraries must come from the same build of
    glibc.)  While the __fe_dfl_env value for soft-float was appropriate
    for the soft-float fenv_t representation, the other two constants had
    the same bit-patterns as for hard-float.  Those bit patterns had the
    effect of having exceptions already raised, causing
    math/test-fenv-return to fail; this patch fixes the patterns used.
    (__fe_nonieee_env also had exceptions unmasked, though they should be
    masked to match hard-float semantics.  Since there is no separate
    non-IEEE mode for soft-float, it's most appropriate for
    __fe_nonieee_env to be the same as __fe_dfl_env; this patch makes it
    an alias.)

    Tested for powerpc-nofpu.

        [BZ #17261]
        * sysdeps/powerpc/nofpu/fenv_const.c (__fe_enabled_env): Change
        value to 0.
        (__fe_nonieee_env): Define as an alias for __fe_dfl_env.

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

Summary of changes:
 ChangeLog                          |    7 +++++++
 NEWS                               |   28 ++++++++++++++--------------
 sysdeps/powerpc/nofpu/fenv_const.c |    8 ++++----
 3 files changed, 25 insertions(+), 18 deletions(-)

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