Unsigned saturating rounding shift right narrow by immediate (top)
Shift each unsigned integer value in the source vector elements by an immediate value, and place the rounded 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.
| 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 | 0 | tszh | 1 | tszl | imm3 | 0 | 0 | 1 | 1 | 1 | 1 | Zn | Zd | |||||||||||
| U | R | T | |||||||||||||||||||||||||||||
if !HaveSVE2() && !HaveSME() then UNDEFINED; bits(3) tsize = tszh:tszl; if tsize == '000' then UNDEFINED; constant integer esize = 8 << HighestSetBit(tsize); integer n = UInt(Zn); integer d = UInt(Zd); integer shift = (2 * esize) - UInt(tsize:imm3);
| <Zd> |
Is the name of the destination scalable vector register, encoded in the "Zd" field. |
| <T> |
Is the size specifier,
encoded in
|
| <Zn> |
Is the name of the source scalable vector register, encoded in the "Zn" field. |
| <Tb> |
Is the size specifier,
encoded in
|
| <const> |
Is the immediate shift amount, in the range 1 to number of bits per element, encoded in "tszh:tszl:imm3". |
CheckSVEEnabled(); constant integer VL = CurrentVL; constant integer PL = VL DIV 8; constant integer elements = VL DIV (2 * esize); bits(VL) operand = Z[n, VL]; bits(VL) result = Z[d, VL]; for e = 0 to elements-1 bits(2*esize) element = Elem[operand, e, 2*esize]; integer res = (UInt(element) + (1 << (shift-1))) >> shift; Elem[result, 2*e + 1, esize] = UnsignedSat(res, esize); Z[d, VL] = result;
Internal version only: aarchmrs v2023-12_rel, pseudocode v2023-12_rel, sve v2023-12_rel ; Build timestamp: 2023-12-15T16:46
Copyright © 2010-2023 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.