[Bug 253847] Printf does not work correctly for denormal doubles on non-x86

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253847

--- Comment #2 from commit-hook at FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=0e4ff0acbe80c547988bede738af2e227c7eb47c

commit 0e4ff0acbe80c547988bede738af2e227c7eb47c
Author:     Alex Richardson <arichardson at FreeBSD.org>
AuthorDate: 2021-03-01 14:27:30 +0000
Commit:     Alex Richardson <arichardson at FreeBSD.org>
CommitDate: 2021-03-01 14:27:30 +0000

    AArch64: Don't set flush-subnormals-to-zero flag on startup

    This flag has been set on startup since
65618fdda0f272a823e6701966421bdca0efa301.
    However, This causes some of the math-related tests to fail as they report
    zero instead of a tiny number. This fixes at least
    /usr/tests/lib/msun/ldexp_test and possibly others.
    Additionally, setting this flag prevents printf() from printing subnormal
    numbers in decimal form.
    See also https://www.openwall.com/lists/musl/2021/02/26/1

    PR:             253847
    Reviewed By:    mmel
    Differential Revision: https://reviews.freebsd.org/D28938

 lib/libc/tests/stdio/printfloat_test.c | 35 +++++++++++++++++++++++++++++++++-
 sys/arm64/arm64/vm_machdep.c           |  2 +-
 2 files changed, 35 insertions(+), 2 deletions(-)

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