H.2.3.3 Rounding styles

1

The C Standard requires all floating types to use the same radix and rounding style, so that only one identifier for each is provided to map to LIA-1.

2

The FLT_ROUNDS parameter can be used to indicate the LIA-1 rounding styles:

truncate      FLT_ROUNDS == 0

nearest        FLT_ROUNDS == 1
other          FLT_ROUNDS != 0 && FLT_ROUNDS != 1

provided that an implementation extends FLT_ROUNDS to cover the rounding style used in all relevant LIA-1 operations, not just addition as in C.