softfloat: add _set_sign(), _infinity and _half for 32 and 64 bits floats.
These constants and utility function are needed to implement some helpers. Defining constants avoids the need to re-compute them at runtime. Signed-off-by: NChristophe Lyon <christophe.lyon@st.com> Reviewed-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
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