fpu/softfloat: re-factor add/sub
We can now add float16_add/sub and use the common decompose and canonicalize functions to have a single implementation for float16/32/64 add and sub functions. Signed-off-by: NAlex Bennée <alex.bennee@linaro.org> Signed-off-by: NRichard Henderson <richard.henderson@linaro.org> Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
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