[Bug 298260] [libm] fmaf() mishandled some subnormal input

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=298260

--- Comment #11 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=b08e6a3882b44a09fbda84dd315a431c7a585219

commit b08e6a3882b44a09fbda84dd315a431c7a585219
Author:     Steve Kargl <kargl@FreeBSD.org>
AuthorDate: 2026-09-10 23:18:58 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2026-09-11 17:53:08 +0000

    lib/msun: use the same algorithm for sw fmaf(3) as for fma(3)

    This fixes rounding at the last bit for subnormals.

    PR:     298260
    Reviewed by:    kib
    MFC after:      1 week
    Differential revision:  https://reviews.freebsd.org/D59579

 lib/msun/src/s_fmaf.c | 254 +++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 230 insertions(+), 24 deletions(-)

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