AE_TRUNCP24Q48X2 — 2-way truncate of 17.47-bit fraction to 1.23-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_TRUNCP24Q48X2 1000000000010101 1010
ae_fld_dr_to_dr_v 3210
ae_fld_dr_to_dr_v0 3210
ae_fld_dr_to_dr_v1 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_TRUNCP24Q48X2 00011101 0100
ae_fld_dr_to_dr_v 3210
ae_fld_dr_to_dr_v0 3210
ae_fld_dr_to_dr_v1 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_TRUNCP24Q48X2 0111110
ae_fld_dr_to_dr_v 3210
ae_fld_dr_to_dr_v0 3210
ae_fld_dr_to_dr_v1 3210

Assembler Syntax

AE_TRUNCP24Q48X2 aed0..15(ae_dr_to_dr_v), aed0..15(ae_dr_to_dr_v0), aed0..15(ae_dr_to_dr_v1)

C Syntax

#include <xtensa/tie/xt_hifi2.h>

extern ae_p24x2s AE_TRUNCP24Q48X2(ae_q56s d0, ae_q56s d1);

Description

AE_TRUNCP24Q48X2 Truncate two 17.47-bit fixed-point fractions from AE_DR registers dh and dl into two 1.23-bit fixed-point fractions, sign-extend them to 9.23-bit values and store in the two 32-bit elements of AE_DR register d.

Implementation Pipeline

In Out
ae_dr_to_dr_v0 Mstage, ae_dr_to_dr_v1 Mstage ae_dr_to_dr_v Mstage

Protos that use AE_TRUNCP24Q48X2

proto AE_TRUNCP24Q48 { out ae_p24x2s d, in ae_q56s d0 }{}{
AE_TRUNCP24Q48X2 d, d0, d0;
}
proto AE_TRUNCP24Q48X2 { out ae_p24x2s d, in ae_q56s d0, in ae_q56s d1 }{}{
AE_TRUNCP24Q48X2 d, d0, d1;
}