(old) htmldiff from-(new)

SQSHRUNT

Signed saturating shift right unsigned narrow by immediate (top).

Shift each signed integer value in the source vector elements right by an immediate value, and place the truncated results in the odd-numbered half-width destination elements, leaving the even-numbered elements unchanged. Each result element is saturated to the half-width N-bit element's unsigned integer range 0 to (2N)-1. The immediate shift amount is an unsigned value in the range 1 to number of bits per element. This instruction is unpredicated.

313029282726252423222120191817161514131211109876543210
010001010tszh1tszlimm3000001ZnZd

SVE2

SQSHRUNT <Zd>.<T>, <Zn>.<Tb>, #<const>

if !HaveSVE2() then UNDEFINED; bits(3) tsize = tszh:tszl; case tsize of when '000' UNDEFINED; when '001' esize = 8; when '01x' esize = 16; when '1xx' esize = 32; integer n = UInt(Zn); integer d = UInt(Zd); integer shift = (2 * esize) - UInt(tsize:imm3);

Assembler Symbols

<Zd>

Is the name of the destination scalable vector register, encoded in the "Zd" field.

<T> Is the size specifier, encoded in tszh:tszl:
tszhtszl<T>
000RESERVED
001B
01xH
1xxS
<Zn>

Is the name of the first source scalable vector register, encoded in the "Zn" field.

<Tb> Is the size specifier, encoded in tszh:tszl:
tszhtszl<Tb>
000RESERVED
001H
01xS
1xxD
<const>

Is the immediate shift amount, in the range 1 to number of bits per element, encoded in "tsz:imm3".

Operation

CheckSVEEnabled(); integer elements = VL DIV (2 * esize); bits(VL) operand = Z[n]; bits(VL) result = Z[d]; for e = 0 to elements-1 bits(2*esize) element = Elem[operand, e, 2*esize]; integer res = SInt(element) >> shift; Elem[result, 2*e + 1, esize] = UnsignedSat(res, esize); Z[d] = result;

Operational information

If PSTATE.DIT is 1:


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)