(old) htmldiff from-(new)

URSHR

Unsigned rounding shift right by immediate.

Shift right by immediate each active unsigned element of the source vector, and destructively place the rounded results in the corresponding elements of the source vector. The immediate shift amount is an unsigned value in the range 1 to number of bits per element. Inactive elements in the destination vector register remain unmodified.

313029282726252423222120191817161514131211109876543210
00000100tszh001101100Pgtszlimm3Zdn

SVE2

URSHR <Zdn>.<T>, <Pg>/M, <Zdn>.<T>, #<const>

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 g = UInt(Pg); integer dn = UInt(Zdn); integer shift = (2 * esize) - UInt(tsize:imm3);

Assembler Symbols

<Zdn>

Is the name of the source and destination scalable vector register, encoded in the "Zdn" field.

<T> Is the size specifier, encoded in tszh:tszl:
tszhtszl<T>
0000RESERVED
0001B
001xH
01xxS
1xxxD
<Pg>

Is the name of the governing scalable predicate register P0-P7, encoded in the "Pg" field.

<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 esize; bits(VL) operand1 = Z[dn]; bits(PL) mask = P[g]; bits(VL) result; integer round_const = 1 << (shift-1); for e = 0 to elements-1 integer element1 = UInt(Elem[operand1, e, esize]); if ElemP[mask, e, esize] == '1' then integer res = (element1 + round_const) >> shift; Elem[result, e, esize] = res<esize-1:0>; else Elem[result, e, esize] = Elem[operand1, e, esize]; Z[dn] = result;

Operational information

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:

The MOVPRFX instructions that can be used with this instruction are as follows:


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)