Options - 2025.2 English - UG1079

There are rich sets of MAC intrinsic with additional operations like pre-adding, pre-subtraction, and conjugation. The naming convention for the vector MAC intrinsics is as follows. Optional characteristics are shown in [] and mandatory ones in {}.

[l]{mac|msc|mul|negmul}{2|4|8|16}[_abs|_max|_min|_maxdiff][_conj][{_sym|_antisym}[_ct|_uct]][_c|_cc|_cn|_nc]

Every operation will either be a multiplication, initializing an accumulator, or a MAC operation which accumulates to a running accumulator of 2, 4, 8, or 16 lanes.

l

Denotes that an accumulator with 80-bit lanes is used for the operation.

sym and antisym

Indicates the use of pre-adding and pre-subtraction respectively.

max, min, and maxdiff

Indicates the pre-selection of lanes in the xbuff based on the maximum, minimum, or maximum difference value.

abs

Indicates the pre-computation of the absolute value in the xbuff.

ct

Used for partial pre-adding and pre-subtraction (separate selection for the data input from X for the final column).

uct

Used for unit center optimization for certain types of FIR filters. Refer to the AI Engine Intrinsics User Guide (UG1078) for more information.

n and c

Indicates that the complex conjugate will be used for one of the input buffers with complex values:

c

Only the complex input buffer is conjugated.

cn

Complex conjugate of X (or XY if using pre-adding) buffer.

nc

Complex conjugate of Z buffer.

cc

Complex conjugate of both X (or XY if using pre-adding) and Z buffers.

conj

Indicates that the complex conjugate of Z is used when multiplying the data input from Y.