Use std::fesetround / std::nearbyint for half-to-even rounding

C++ floating-point environment has thread storage duration, so
std::fesetround call is thread-safe.
std::nearbyint uses half-to-even rounding with FE_TONEAREST,
as specified in ISO/IEC 9899:1999 F.3, and in Appendix to
ANSI/IEEE 854.

Change-Id: I26995842c30e2663b40af5b5314791c1328037d4
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/117307
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

0 files changed, 0 insertions, 0 deletions