AE_SB.IC — store low bits of AR register to bit stream, count in state register, with AR register update in case of memory store

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_SB.IC 011101111011 0100
s 3210
t 3210

Assembler Syntax

AE_SB.IC a0..15(ars), a0..15(art)

C Syntax

#include <xtensa/tie/xt_hifi2.h>

extern void AE_SB_IC(unsigned short * a /*inout*/, unsigned bits);

Description

AE_SB.IC stores low bits from a0 to a bit stream pointed to by a. The number of bits to store comes from the AE_BITSUSED state. If a store to memory is needed to maintain the invariant that fewer than 16 bits are buffered in AE_BITHEAD, a is updated with a circular wrap-around for the next store-bits operation.

Implementation Pipeline

In Out
AE_CBEGIN0 Mstage, AE_CEND0 Mstage, AE_BITSUSED Mstage, AE_BITPTR Mstage, AE_BITHEAD Mstage, ars Estage, art Mstage AE_CWRAP Mstage, AE_BITPTR Mstage, AE_BITHEAD Mstage, ars Mstage

Protos that use AE_SB.IC

proto AE_SB.IC { inout uint16 * a, in uint32 bits }{}{
AE_SB.IC a, bits;
}
proto AE_SB.XC { inout uint16 * a, in uint32 bits }{}{
AE_SB.IC a, bits;
}