ADD.N — Narrow Add

Instruction Word

Slot
Inst16a
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 x16a - 16 bit(s) 10
ADD.N 1010
r 3210
s 3210
t 3210

Assembler Syntax

ADD.N ar, as, at

C Syntax

#include <xtensa/tie/xt_density.h>

extern int XT_ADD_N(int s, int t);

Description

(please consult the Xtensa ® Instruction Set Architecture Reference Manual for any cross references and additional information)

This performs the same operation as the ADD instruction in a 16-bit encoding.

ADD.N calculates the two's complement 32-bit sum of address registers as and at. The low 32 bits of the sum are written to address register ar. Arithmetic overflow is not detected.

Operation

AR[r] ← AR[s] + AR[t]

Exceptions

EveryInstR Group (see EveryInstR Group:)

Implementation Pipeline

In Out
ars Estage, art Estage arr Estage

Protos that use ADD.N

proto ADD.N { out int32 r, in int32 s, in int32 t }{}{
ADD.N r, s, t;
}