Rounding and Saturation Modes - 2022.2 English

• floor - No rounding - Truncate LSB, always round down (towards negative infinity).
• ceil - No rounding - Always round up (towards positive infinity).
• positive_inf - Rounds halfway towards positive infinity.
• negative_inf - Rounds halfway towards negative infinity.
• symmetric_inf - Rounds halfway towards infinity (away from zero).
• symmetric_zero - Rounds halfway towards zero (away from infinity).
• conv_even - Rounds halfway towards nearest even number.
• conv_odd - Rounds halfway towards nearest odd number.

• none - No saturation is performed and the value is truncated on the MSB side.
• saturate - Controls saturation. Saturation rounds an n-bit signed value in the range [- ( 2^(n-1) ) : +2^(n-1) - 1 ]. For example if n=8, the range would be [-128:127].
• symmetric - Controls symmetric saturation. Symmetric saturation rounds an n-bit signed value in the range [- ( 2^(n-1) -1 ) : +2^(n-1) - 1 ]. For example if n=8, the range would be [-127:127].

aie::set_rounding(aie::rounding_mode::ceil);
aie::set_saturation(aie::saturation_mode::saturate);
aie::rounding_mode current_rnd=aie::get_rounding();
aie::saturation_mode current_sat=aie::get_saturation();
...
aie::set_rounding(aie::rounding_mode::floor);
aie::set_saturation(aie::saturation_mode::none);