py/objfloat: Fix abs(-0.0) so it returns 0.0.

Nan and inf (signed and unsigned) are also handled correctly by using
signbit (they were also handled correctly with "val<0", but that didn't
handle -0.0 correctly).  A test case is added for this behaviour.
This commit is contained in:
Damien George 2018-09-27 15:21:25 +10:00
parent 8960a28238
commit b3eadf3f3d
2 changed files with 14 additions and 2 deletions

View File

@ -161,8 +161,7 @@ STATIC mp_obj_t float_unary_op(mp_unary_op_t op, mp_obj_t o_in) {
case MP_UNARY_OP_POSITIVE: return o_in;
case MP_UNARY_OP_NEGATIVE: return mp_obj_new_float(-val);
case MP_UNARY_OP_ABS: {
// TODO check for NaN etc
if (val < 0) {
if (signbit(val)) {
return mp_obj_new_float(-val);
} else {
return o_in;

View File

@ -0,0 +1,13 @@
# test builtin abs function with float args
for val in (
'1.0',
'-1.0',
'0.0',
'-0.0',
'nan',
'-nan',
'inf',
'-inf',
):
print(val, abs(float(val)))