AE_TRUNCQ32 — Truncate the bottom 16 bits of a 17.47-bit fraction

Instruction Word

Slot
ae2_slot0
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_TRUNCQ32 1000000000011010 1010 0010
ae_fld_dr_to_dr_v 3210
ae_fld_dr_to_dr_v0 3210

Slot
Inst
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 x24 - 24 bit(s) 0
AE_TRUNCQ32 00011100 00100100
ae_fld_dr_to_dr_v 3210
ae_fld_dr_to_dr_v0 3210

Slot
ae_slot2_1
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_TRUNCQ32 1001000 0101
ae_fld_dr_to_dr_v 3210
ae_fld_dr_to_dr_v0 3210

Assembler Syntax

AE_TRUNCQ32 aed0..15(ae_dr_to_dr_v), aed0..15(ae_dr_to_dr_v0)

C Syntax

#include <xtensa/tie/xt_hifi2.h>

extern ae_q56s AE_TRUNCQ32(ae_q56s d0);

Description

AE_TRUNCQ32 Truncate (set to zero) the 16 least significant bits of a 17.47-bit fixed-point number in AE_DR register d0 with the result placed into AE_DR register d.

Implementation Pipeline

In Out
ae_dr_to_dr_v0 Mstage ae_dr_to_dr_v Mstage

Protos that use AE_TRUNCQ32

proto AE_TRUNCQ32 { out ae_q56s d, in ae_q56s d0 }{}{
AE_TRUNCQ32 d, d0;
}