(old) | htmldiff from- | (new) |
Signed shift right and accumulate (immediate).
Shift right by immediate each signed element of the source vector, preserving the sign bit, and add the truncated intermediate result destructively to the corresponding elements of the addend vector. The immediate shift amount is an unsigned value in the range 1 to number of bits per element. This instruction is unpredicated.
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
0 | 1 | 0 | 0 | 0 | 1 | 0 | 1 | tszh | 0 | tszl | imm3 | 1 | 1 | 1 | 0 | 0 | 0 | Zn | Zda |
if !HaveSVE2() then UNDEFINED; bits(4) tsize = tszh:tszl; case tsize of when '0000' UNDEFINED; when '0001' esize = 8; when '001x' esize = 16; when '01xx' esize = 32; when '1xxx' esize = 64; integer n = UInt(Zn); integer da = UInt(Zda); integer shift = (2 * esize) - UInt(tsize:imm3);
<Zda> | Is the name of the third source and destination scalable vector register, encoded in the "Zda" field. |
<T> |
Is the size specifier,
encoded in
tszh:tszl:
|
<Zn> | Is the name of the first source scalable vector register, encoded in the "Zn" field. |
<const> | Is the immediate shift amount, in the range 1 to number of bits per element, encoded in "tsz:imm3". |
CheckSVEEnabled(); integer elements = VL DIV esize; bits(VL) operand1 = Z[n]; bits(VL) operand2 = Z[da]; bits(VL) result; for e = 0 to elements-1 integer element = SInt(Elem[operand1, e, esize]) >> shift; Elem[result, e, esize] = Elem[operand2, e, esize] + element<esize-1:0>; Z[da] = result;
If PSTATE.DIT is 1:
This instruction might be immediately preceded in program order by a MOVPRFX instruction that conforms to all of the following requirements, otherwise the behavior of either or both instructions is unpredictable:
Internal version only: isa v30.44v30.42, AdvSIMD v27.08, pseudocode v8.5-2019-06_rc2-5-g22901f2future-20190403, sve v2019-06_rc4v8.5-00bet10_rc5
; Build timestamp: 2019-06-26T222019-04-17T09:0458
Copyright © 2010-2019 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.
(old) | htmldiff from- | (new) |