AE_L32F24.XP — Load a 24-bit fractional value and replicate into the AE_DR register

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_L32F24.XP 1000000000001111 0101
ae_fld_ls_v 3210
s 3210
t 3210

Slot
ae_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_format - 64 bit(s) 1111
AE_L32F24.XP 01110000
ae_fld_ls_v 3210
s 3210
t 3210

Slot
ae_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_format1 - 64 bit(s)1 1110
AE_L32F24.XP 01110000
ae_fld_ls_v 3210
s 3210
t 3210

Assembler Syntax

AE_L32F24.XP aed0..15(ae_ls_v), a0..15(ars), a0..15(art)

C Syntax

#include <xtensa/tie/xt_hifi2.h>

extern void AE_L32F24_XP(ae_f24x2 d /*out*/, const ae_f24 * a /*inout*/, int off);

Description

AE_L32F24.XP loads a 24-bit fractional value from memory. into the AE_DR register. It forms a virtual address using the address register.

The load instruction reads the most significant 24 bits (3 bytes) of the 32-bit word, sign-extends it into 32-bits and replicates into the two halves of the AE_DR register.

The intent is that the value in memory represents a 32-bit (1.31) fraction that gets truncated and placed into the AE_DR register d as a 9.23-bit fraction.

This instruction also post-increments the address register by the contents of the index register.

Implementation Pipeline

In Out
ars Estage, art Estage ae_ls_v Mstage, ars Estage

Protos that use AE_L32F24.XP

proto AE_L32F24.XP { out ae_f24x2 d, inout const ae_f24 * a, in int32 off }{}{
AE_L32F24.XP d, a, off;
}
proto ae_f24_loadxp { out ae_f24 d, inout const ae_f24 * a, in int32 off }{}{
AE_L32F24.XP d, a, off;
}
proto ae_p24f_loadxp { out ae_p24f d, inout const ae_p24f * a, in int32 off }{}{
AE_L32F24.XP d, a, off;
}