The re-factoring of div_floats changed the order of checking meaning an operation like -inf/0 erroneously raises the divbyzero flag. IEEE-754 (2008) specifies this should only occur for operations on finite operands.
We fix this by moving the check on the dividend being Inf/0 to before the divisor is zero check. Signed-off-by: Alex Bennée <alex.ben...@linaro.org> Cc: Bastian Koppelmann <kbast...@mail.uni-paderborn.de> --- fpu/softfloat.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/fpu/softfloat.c b/fpu/softfloat.c index b46dccc63e..a7d0f3ff56 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -1146,6 +1146,11 @@ static FloatParts div_floats(FloatParts a, FloatParts b, float_status *s) a.cls = float_class_dnan; return a; } + /* Inf / x or 0 / x */ + if (a.cls == float_class_inf || a.cls == float_class_zero) { + a.sign = sign; + return a; + } /* Div 0 => Inf */ if (b.cls == float_class_zero) { s->float_exception_flags |= float_flag_divbyzero; @@ -1153,11 +1158,6 @@ static FloatParts div_floats(FloatParts a, FloatParts b, float_status *s) a.sign = sign; return a; } - /* Inf / x or 0 / x */ - if (a.cls == float_class_inf || a.cls == float_class_zero) { - a.sign = sign; - return a; - } /* Div by Inf */ if (b.cls == float_class_inf) { a.cls = float_class_zero; -- 2.17.0