AE_MULZASFD24.HL.LH_S2 — 24x24-bit signed fraction (1.23) dual MAC with Addition/Subtraction and 64-bit (17.47) result, without saturation, zeroed accumulator.: slot 2 version

Instruction Word

Slot
ae_slot2_0
6
3
6
2
6
1
6
0
5
9
5
8
5
7
5
6
5
5
5
4
5
3
5
2
5
1
5
0
4
9
4
8
4
7
4
6
4
5
4
4
4
3
4
2
4
1
4
0
3
9
3
8
3
7
3
6
3
5
3
4
3
3
3
2
3
1
3
0
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1
9
1
8
1
7
1
6
1
5
1
4
1
3
1
2
1
1
1
0
9876543210
Format ae_format - 64 bit(s) 1111
AE_MULZASFD24.HL.LH_S211010010
ae_fld_mul_x2_S2_q0 3210
ae_fld_mul_x2_S2_d0 3210
ae_fld_mul_x2_S2_d1 3210

Assembler Syntax

AE_MULZASFD24.HL.LH_S2 aed0..15(ae_mul_S2_q0), aed0..15(ae_mul_S2_d0), aed0..15(ae_mul_S2_d1)

C Syntax

#include <xtensa/tie/xt_hifi2.h>

extern ae_f64 AE_MULZASFD24_HL_LH_S2(ae_f24x2 d0, ae_f24x2 d1);

Description

AE_MULZASFD24.HL.LH is a 24x24-bit signed fraction (1.23) dual MAC with 64-bit (17.47) result, without saturation. The extension HL.LH indicates that the two multiplication results are (1) the H element of the first AE_DR operand times the L element of the second AE_DR operand; and (2) the L element of the first AE_DR operand times the H element of the second AE_DR operand. and the initial accumultator contents are zeroed before writing into the accumulator. AS indicates that the first multiply result is added to the accumulator, and the second multiply result is subtracted from the accumulator.

This is equivalent to AE_MULZASFD24.HL.LH and will be automatically used by the compiler as needed.

Implementation Pipeline

In Out
ae_mul_S2_d0 Mstage, ae_mul_S2_d1 Mstage ae_mul_S2_q0 Wstage

Protos that use AE_MULZASFD24.HL.LH_S2

proto AE_MULZASFD24.HL.LH_S2 { out ae_f64 d, in ae_f24x2 d0, in ae_f24x2 d1 }{}{
AE_MULZASFD24.HL.LH_S2 d, d0, d1;
}
proto AE_MULZASFP24S.HL.LH_S2 { out ae_q56s d, in ae_p24x2s d0, in ae_p24x2s d1 }{}{
AE_MULZASFD24.HL.LH_S2 d, d0, d1;
}
proto AE_MULZSAF48P24S.HL.LH_S2 { out ae_f64 d, in ae_f24x2 d0, in ae_f24x2 d1 }{}{
AE_MULZASFD24.HL.LH_S2 d, d1, d0;
}
proto AE_MULZSAFP24S.HL.LH_S2 { out ae_q56s d, in ae_p24x2s d0, in ae_p24x2s d1 }{}{
AE_MULZASFD24.HL.LH_S2 d, d1, d0;
}