AE_TRUNCP16 — Truncate two 9.23-bit fractions to 1.15-bits

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_TRUNCP16 1000000000011010 1010 0000
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_TRUNCP16 00011100 00000100
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_TRUNCP16 1001000 0100
ae_fld_dr_to_dr_v 3210
ae_fld_dr_to_dr_v0 3210

Assembler Syntax

AE_TRUNCP16 aed0..15(ae_dr_to_dr_v), aed0..15(ae_dr_to_dr_v0)

C Syntax

#include <xtensa/tie/xt_hifi2.h>

extern ae_int24x2 AE_TRUNCP16(ae_int24x2 d0);

Description

AE_TRUNCP16 Truncate two 9.23-bit fixed-point fractions in AE_DR register d0 to 1.15-bits, and sign-extend them to 9.23-bit fractions into AE_DR register d. The 8 MSBs and the 8 LSBs of the input value are discarded. The 8 LSBs of the result are set to zero.

Implementation Pipeline

In Out
ae_dr_to_dr_v0 Mstage ae_dr_to_dr_v Mstage

Protos that use AE_TRUNCP16

proto AE_TRUNCP16 { out ae_int24x2 d, in ae_int24x2 d0 }{}{
AE_TRUNCP16 d, d0;
}