AE_SRA64_32 — Convert a 1.31 into a 17.47 and shift right

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_SRA64_32 1000000000001100 1111
ae_fld_shift_d 3210
ae_fld_shift_d0 3210
s 3210

Assembler Syntax

AE_SRA64_32 aed0..15(ae_shift_d), aed0..15(ae_shift_d0), a0..15(ars)

C Syntax

#include <xtensa/tie/xt_hifi2.h>

extern ae_int64 AE_SRA64_32(ae_int32x2 s, unsigned sa);

Description

AE_SRA64_32 converts the 1.31-bit value in s into a 17.47 value by shifting left by 16- bits, filling in the bottom bits with zero and then sign extending the upper 16-bits. The 17.47-bit result is then shifted right using the bottom four bits of the shift amount register AE_SAR.

Implementation Pipeline

In Out
ae_shift_d0 Mstage, ars Estage ae_shift_d Mstage

Protos that use AE_SRA64_32

proto AE_SRA64_32 { out ae_int64 d, in ae_int32x2 s, in uint32 sa }{}{
AE_SRA64_32 d, s, sa;
}