AE_SHA32 — swaps bytes in each halfword of 32-bit AR register

Instruction Word

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_SHA32 00110110 10000100
r 3210
s 3210

Assembler Syntax

AE_SHA32 a0..15(arr), a0..15(ars)

C Syntax

#include <xtensa/tie/xt_hifi2.h>

extern unsigned AE_SHA32(unsigned ai);

Description

AE_SHA32 swaps 32 bits for halfword access. This instruction is used to swap bytes in the two halfwords in an AR, typically for endianness change during a memcpy()-like operation. For example, if a0 contains 0x12345678 before the AE_SHA32 instruction executes, a contains 0x34127856 immediately afterward.

Implementation Pipeline

In Out
ars Estage arr Estage

Protos that use AE_SHA32

proto AE_SHA32 { out uint32 ao, in uint32 ai }{}{
AE_SHA32 ao, ai;
}