Single-copy Atomic 64-byte Load derives an address from a base register value, loads eight 64-bit doublewords from a memory location, and writes them to consecutive registers, Xt to X(t+7). The data that is loaded is atomic and is required to be 64-byte aligned.
| 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 |
| 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 0 | 0 | Rn | Rt | ||||||||
if !HaveFeatLS64() then UNDEFINED; if Rt<4:3> == '11' || Rt<0> == '1' then UNDEFINED; integer n = UInt(Rn); integer t = UInt(Rt); boolean tag_checked = n != 31;
| <Xt> |
Is the 64-bit name of the first general-purpose register to be transferred, encoded in the "Rt" field. |
| <Xn|SP> |
Is the 64-bit name of the general-purpose base register or stack pointer, encoded in the "Rn" field. |
CheckLDST64BEnabled(); bits(512) data; bits(64) address; bits(64) value; acctype = AccType_ATOMICLS64; if HaveMTE2Ext() then SetTagCheckedInstruction(tag_checked); if n == 31 then CheckSPAlignment(); address = SP[]; else address = X[n]; data = MemLoad64B(address, acctype); for i = 0 to 7 value = data<63+64*i : 64*i>; if BigEndian(acctype) then value = BigEndianReverse(value); X[t+i] = value;
Internal version only: isa v33.11seprel, AdvSIMD v29.05, pseudocode v2021-09_rel, sve v2021-09_rc3d ; Build timestamp: 2021-10-06T11:41
Copyright © 2010-2021 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.