AE_MULSF16SS.00 — 16x16-bit signed fractional (1.15) multiply-subtract with 32-bit (1.31) results, with intermediate product and accumulator saturation.

Instruction Word

Slot
ae2_slot1
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_format2 - 64 bit(s)0000 1110
AE_MULSF16SS.00 1101 1000 1110
ae_fld_mul_q0 3210
ae_fld_mul_d0 3210
ae_fld_mul_d1 3210

Slot
ae_slot1
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_MULSF16SS.00 10010001
ae_fld_mul_q0 3210
ae_fld_mul_d0 3210
ae_fld_mul_d1 3210

Slot
ae_slot1
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_format1 - 64 bit(s)1 1110
AE_MULSF16SS.00 10010001
ae_fld_mul_q0 3210
ae_fld_mul_d0 3210
ae_fld_mul_d1 3210

Assembler Syntax

AE_MULSF16SS.00 aed0..15(ae_mul_q0), aed0..15(ae_mul_d0), aed0..15(ae_mul_d1)

C Syntax

#include <xtensa/tie/xt_hifi2.h>

extern void AE_MULSF16SS_00(ae_f32x2 d /*inout*/, ae_f16x4 d0, ae_f16x4 d1);

Description

AE_MULSF16SS.00 is a 16x16-bit signed fractional (1.15) multiply-subtract with 32-bit (1.31) result with intermediate product and accumulator saturation. The extension 00 indicates that multiplication result is the product of the two AE_DR operands' 0 elements. This operation is bit exact with the ITU-T L_msu basic operation.

Implementation Pipeline

In Out
AE_OVERFLOW Wstage, ae_mul_q0 Wstage, ae_mul_d0 Mstage, ae_mul_d1 Mstage AE_OVERFLOW Wstage, ae_mul_q0 Wstage

Protos that use AE_MULSF16SS.00

proto AE_MULSF16SS.00 { inout ae_f32x2 d, in ae_f16x4 d0, in ae_f16x4 d1 }{}{
AE_MULSF16SS.00 d, d0, d1;
}
proto AE_MULSF16X4SS_scalar { out int32 aout, in int32 ain, in ae_int16 d0, in ae_int16 d1 }{ae_int32 t}{
AE_MOVDA32 t, ain;
AE_MULSF16SS.00 t, d0, d1;
AE_MOVAD32.L aout, t;
}