| AI Engine-ML Intrinsics User Guide (v2026.1)

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Multiply-accumulate of bfloat16 datatypes
Vector Operations » Multiply Accumulate

## Overview

Matrix multiplications in which matrix A and B have bfloat16 data elements.

For an explanation how these operations works see Multiply Accumulate.

## Multiplication of (4x8) with (8x4)
v16accfloat | mul_4x8_8x4 (v32bfloat16 a, v32bfloat16 b)
v16accfloat | negmul_4x8_8x4 (v32bfloat16 a, v32bfloat16 b)
v16accfloat | mac_4x8_8x4 (v32bfloat16 a, v32bfloat16 b, v16accfloat acc1)
v16accfloat | msc_4x8_8x4 (v32bfloat16 a, v32bfloat16 b, v16accfloat acc1)
v16accfloat | addmac_4x8_8x4 (v32bfloat16 a, v32bfloat16 b, v16accfloat acc1, v16accfloat acc2)
v16accfloat | addmsc_4x8_8x4 (v32bfloat16 a, v32bfloat16 b, v16accfloat acc1, v16accfloat acc2)

## Multiplication of (4x8) with (8x4) with dynamic negation of multiplication result
v16accfloat | mul_4x8_8x4_conf (v32bfloat16 a, v32bfloat16 b, int sub_mul)
v16accfloat | negmul_4x8_8x4_conf (v32bfloat16 a, v32bfloat16 b, int sub_mul)

## Multiplication of (4x8) with (8x4) with dynamic negation of multiplication result, zeroing of acc1, and negation of acc1
v16accfloat | mac_4x8_8x4_conf (v32bfloat16 a, v32bfloat16 b, v16accfloat acc1, int zero_acc1, int sub_mul, int sub_acc1)
v16accfloat | msc_4x8_8x4_conf (v32bfloat16 a, v32bfloat16 b, v16accfloat acc1, int zero_acc1, int sub_mul, int sub_acc1)
v16accfloat | addmac_4x8_8x4_conf (v32bfloat16 a, v32bfloat16 b, v16accfloat acc1, v16accfloat acc2, int zero_acc1, int sub_mul, int sub_acc1, int sub_acc2)
v16accfloat | addmsc_4x8_8x4_conf (v32bfloat16 a, v32bfloat16 b, v16accfloat acc1, v16accfloat acc2, int zero_acc1, int sub_mul, int sub_acc1, int sub_acc2)

## Channel by channel multiplication of (1x2) with (2x1)
v16accfloat | mul_elem_16_2 (v32bfloat16 a, v32bfloat16 b)
v16accfloat | negmul_elem_16_2 (v32bfloat16 a, v32bfloat16 b)
v16accfloat | mac_elem_16_2 (v32bfloat16 a, v32bfloat16 b, v16accfloat acc1)
v16accfloat | msc_elem_16_2 (v32bfloat16 a, v32bfloat16 b, v16accfloat acc1)
v16accfloat | addmac_elem_16_2 (v32bfloat16 a, v32bfloat16 b, v16accfloat acc1, v16accfloat acc2)
v16accfloat | addmsc_elem_16_2 (v32bfloat16 a, v32bfloat16 b, v16accfloat acc1, v16accfloat acc2)

## Channel by channel multiplication of (1x2) with (2x1) with dynamic negation of multiplication result
v16accfloat | mul_elem_16_2_conf (v32bfloat16 a, v32bfloat16 b, int sub_mul)
v16accfloat | negmul_elem_16_2_conf (v32bfloat16 a, v32bfloat16 b, int sub_mul)

## Channel by channel multiplication of (1x2) with (2x1) with dynamic negation of multiplication result, zeroing of acc1, and negation of acc1
v16accfloat | mac_elem_16_2_conf (v32bfloat16 a, v32bfloat16 b, v16accfloat acc1, int zero_acc1, int sub_mul, int sub_acc1)
v16accfloat | msc_elem_16_2_conf (v32bfloat16 a, v32bfloat16 b, v16accfloat acc1, int zero_acc1, int sub_mul, int sub_acc1)
v16accfloat | addmac_elem_16_2_conf (v32bfloat16 a, v32bfloat16 b, v16accfloat acc1, v16accfloat acc2, int zero_acc1, int sub_mul, int sub_acc1, int sub_acc2)
v16accfloat | addmsc_elem_16_2_conf (v32bfloat16 a, v32bfloat16 b, v16accfloat acc1, v16accfloat acc2, int zero_acc1, int sub_mul, int sub_acc1, int sub_acc2)

## Function Documentation

## ◆ addmac_4x8_8x4()

v16accfloat addmac_4x8_8x4 | ( | v32bfloat16 | a,
|  | v32bfloat16 | b,
|  | v16accfloat | acc1,
|  | v16accfloat | acc2 )

Parameters

  a | Matrix A
  b | Matrix B
  acc1 | Accumulator 1 input
  acc2 | Accumulator 2 input

Returns
  Result of operation

## ◆ addmac_4x8_8x4_conf()

v16accfloat addmac_4x8_8x4_conf | ( | v32bfloat16 | a,
|  | v32bfloat16 | b,
|  | v16accfloat | acc1,
|  | v16accfloat | acc2,
|  | int | zero_acc1,
|  | int | sub_mul,
|  | int | sub_acc1,
|  | int | sub_acc2 )

Parameters

  a | Matrix A
  b | Matrix B
  acc1 | Accumulator 1 input
  acc2 | Accumulator 2 input
  zero_acc1 | Zeroing mask for acc1
  sub_mul | Negation mask of multiplication result
  sub_acc1 | Negation mask of acc1
  sub_acc2 | Negation mask of acc2

Returns
  Result of operation

## ◆ addmac_elem_16_2()

v16accfloat addmac_elem_16_2 | ( | v32bfloat16 | a,
|  | v32bfloat16 | b,
|  | v16accfloat | acc1,
|  | v16accfloat | acc2 )

Parameters

  a | Matrix A
  b | Matrix B
  acc1 | Accumulator 1 input
  acc2 | Accumulator 2 input

Returns
  Result of operation

## ◆ addmac_elem_16_2_conf()

v16accfloat addmac_elem_16_2_conf | ( | v32bfloat16 | a,
|  | v32bfloat16 | b,
|  | v16accfloat | acc1,
|  | v16accfloat | acc2,
|  | int | zero_acc1,
|  | int | sub_mul,
|  | int | sub_acc1,
|  | int | sub_acc2 )

Parameters

  a | Matrix A
  b | Matrix B
  acc1 | Accumulator 1 input
  acc2 | Accumulator 2 input
  zero_acc1 | Zeroing mask for acc1
  sub_mul | Negation mask of multiplication result
  sub_acc1 | Negation mask of acc1
  sub_acc2 | Negation mask of acc2

Returns
  Result of operation

## ◆ addmsc_4x8_8x4()

v16accfloat addmsc_4x8_8x4 | ( | v32bfloat16 | a,
|  | v32bfloat16 | b,
|  | v16accfloat | acc1,
|  | v16accfloat | acc2 )

Parameters

  a | Matrix A
  b | Matrix B
  acc1 | Accumulator 1 input
  acc2 | Accumulator 2 input

Returns
  Result of operation

## ◆ addmsc_4x8_8x4_conf()

v16accfloat addmsc_4x8_8x4_conf | ( | v32bfloat16 | a,
|  | v32bfloat16 | b,
|  | v16accfloat | acc1,
|  | v16accfloat | acc2,
|  | int | zero_acc1,
|  | int | sub_mul,
|  | int | sub_acc1,
|  | int | sub_acc2 )

Parameters

  a | Matrix A
  b | Matrix B
  acc1 | Accumulator 1 input
  acc2 | Accumulator 2 input
  zero_acc1 | Zeroing mask for acc1
  sub_mul | Negation mask of multiplication result
  sub_acc1 | Negation mask of acc1
  sub_acc2 | Negation mask of acc2

Returns
  Result of operation

## ◆ addmsc_elem_16_2()

v16accfloat addmsc_elem_16_2 | ( | v32bfloat16 | a,
|  | v32bfloat16 | b,
|  | v16accfloat | acc1,
|  | v16accfloat | acc2 )

Parameters

  a | Matrix A
  b | Matrix B
  acc1 | Accumulator 1 input
  acc2 | Accumulator 2 input

Returns
  Result of operation

## ◆ addmsc_elem_16_2_conf()

v16accfloat addmsc_elem_16_2_conf | ( | v32bfloat16 | a,
|  | v32bfloat16 | b,
|  | v16accfloat | acc1,
|  | v16accfloat | acc2,
|  | int | zero_acc1,
|  | int | sub_mul,
|  | int | sub_acc1,
|  | int | sub_acc2 )

Parameters

  a | Matrix A
  b | Matrix B
  acc1 | Accumulator 1 input
  acc2 | Accumulator 2 input
  zero_acc1 | Zeroing mask for acc1
  sub_mul | Negation mask of multiplication result
  sub_acc1 | Negation mask of acc1
  sub_acc2 | Negation mask of acc2

Returns
  Result of operation

## ◆ mac_4x8_8x4()

v16accfloat mac_4x8_8x4 | ( | v32bfloat16 | a,
|  | v32bfloat16 | b,
|  | v16accfloat | acc1 )

Parameters

  a | Matrix A
  b | Matrix B
  acc1 | Accumulator 1 input

Returns
  Result of operation

## ◆ mac_4x8_8x4_conf()

v16accfloat mac_4x8_8x4_conf | ( | v32bfloat16 | a,
|  | v32bfloat16 | b,
|  | v16accfloat | acc1,
|  | int | zero_acc1,
|  | int | sub_mul,
|  | int | sub_acc1 )

Parameters

  a | Matrix A
  b | Matrix B
  acc1 | Accumulator 1 input
  zero_acc1 | Zeroing mask for acc1
  sub_mul | Negation mask of multiplication result
  sub_acc1 | Negation mask of acc1

Returns
  Result of operation

## ◆ mac_elem_16_2()

v16accfloat mac_elem_16_2 | ( | v32bfloat16 | a,
|  | v32bfloat16 | b,
|  | v16accfloat | acc1 )

Parameters

  a | Matrix A
  b | Matrix B
  acc1 | Accumulator 1 input

Returns
  Result of operation

## ◆ mac_elem_16_2_conf()

v16accfloat mac_elem_16_2_conf | ( | v32bfloat16 | a,
|  | v32bfloat16 | b,
|  | v16accfloat | acc1,
|  | int | zero_acc1,
|  | int | sub_mul,
|  | int | sub_acc1 )

Parameters

  a | Matrix A
  b | Matrix B
  acc1 | Accumulator 1 input
  zero_acc1 | Zeroing mask for acc1
  sub_mul | Negation mask of multiplication result
  sub_acc1 | Negation mask of acc1

Returns
  Result of operation

## ◆ msc_4x8_8x4()

v16accfloat msc_4x8_8x4 | ( | v32bfloat16 | a,
|  | v32bfloat16 | b,
|  | v16accfloat | acc1 )

Parameters

  a | Matrix A
  b | Matrix B
  acc1 | Accumulator 1 input

Returns
  Result of operation

## ◆ msc_4x8_8x4_conf()

v16accfloat msc_4x8_8x4_conf | ( | v32bfloat16 | a,
|  | v32bfloat16 | b,
|  | v16accfloat | acc1,
|  | int | zero_acc1,
|  | int | sub_mul,
|  | int | sub_acc1 )

Parameters

  a | Matrix A
  b | Matrix B
  acc1 | Accumulator 1 input
  zero_acc1 | Zeroing mask for acc1
  sub_mul | Negation mask of multiplication result
  sub_acc1 | Negation mask of acc1

Returns
  Result of operation

## ◆ msc_elem_16_2()

v16accfloat msc_elem_16_2 | ( | v32bfloat16 | a,
|  | v32bfloat16 | b,
|  | v16accfloat | acc1 )

Parameters

  a | Matrix A
  b | Matrix B
  acc1 | Accumulator 1 input

Returns
  Result of operation

## ◆ msc_elem_16_2_conf()

v16accfloat msc_elem_16_2_conf | ( | v32bfloat16 | a,
|  | v32bfloat16 | b,
|  | v16accfloat | acc1,
|  | int | zero_acc1,
|  | int | sub_mul,
|  | int | sub_acc1 )

Parameters

  a | Matrix A
  b | Matrix B
  acc1 | Accumulator 1 input
  zero_acc1 | Zeroing mask for acc1
  sub_mul | Negation mask of multiplication result
  sub_acc1 | Negation mask of acc1

Returns
  Result of operation

## ◆ mul_4x8_8x4()

v16accfloat mul_4x8_8x4 | ( | v32bfloat16 | a,
|  | v32bfloat16 | b )

Parameters

  a | Matrix A
  b | Matrix B

Returns
  Result of operation

## ◆ mul_4x8_8x4_conf()

v16accfloat mul_4x8_8x4_conf | ( | v32bfloat16 | a,
|  | v32bfloat16 | b,
|  | int | sub_mul )

Parameters

  a | Matrix A
  b | Matrix B
  sub_mul | Negation mask for multiplication result

Returns
  Result of operation

## ◆ mul_elem_16_2()

v16accfloat mul_elem_16_2 | ( | v32bfloat16 | a,
|  | v32bfloat16 | b )

Parameters

  a | Matrix A
  b | Matrix B

Returns
  Result of operation

## ◆ mul_elem_16_2_conf()

v16accfloat mul_elem_16_2_conf | ( | v32bfloat16 | a,
|  | v32bfloat16 | b,
|  | int | sub_mul )

Parameters

  a | Matrix A
  b | Matrix B
  sub_mul | Negation mask for multiplication result

Returns
  Result of operation

## ◆ negmul_4x8_8x4()

v16accfloat negmul_4x8_8x4 | ( | v32bfloat16 | a,
|  | v32bfloat16 | b )

Parameters

  a | Matrix A
  b | Matrix B

Returns
  Result of operation

## ◆ negmul_4x8_8x4_conf()

v16accfloat negmul_4x8_8x4_conf | ( | v32bfloat16 | a,
|  | v32bfloat16 | b,
|  | int | sub_mul )

Parameters

  a | Matrix A
  b | Matrix B
  sub_mul | Negation mask for multiplication result. If a bit of sub_mul is set the corresponding vector lane of the output accumulator will be negated.

Returns
  Result of operation

## ◆ negmul_elem_16_2()

v16accfloat negmul_elem_16_2 | ( | v32bfloat16 | a,
|  | v32bfloat16 | b )

Parameters

  a | Matrix A
  b | Matrix B

Returns
  Result of operation

## ◆ negmul_elem_16_2_conf()

v16accfloat negmul_elem_16_2_conf | ( | v32bfloat16 | a,
|  | v32bfloat16 | b,
|  | int | sub_mul )

Parameters

  a | Matrix A
  b | Matrix B
  sub_mul | Negation mask for multiplication result. If a bit of sub_mul is set the corresponding vector lane of the output accumulator will be negated.

Returns
  Result of operation