Load Tag Multiple reads a naturally aligned block of N Allocation Tags, where the size of N is identified in GMID_EL1.BS, and writes the Allocation Tag read from address A to the destination register at 4*A<7:4>+3:4*A<7:4>. Bits of the destination register not written with an Allocation Tag are set to 0.
This instruction is undefined at EL0.
This instruction generates an Unchecked access.
| 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 | 0 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Xn | Xt | ||||||||
if !HaveMTE2Ext() then UNDEFINED; integer t = UInt(Xt); integer n = UInt(Xn);
| <Xt> |
Is the 64-bit name of the general-purpose register to be transferred, encoded in the "Xt" field. |
| <Xn|SP> |
Is the 64-bit name of the general-purpose base register or stack pointer, encoded in the "Xn" field. |
if PSTATE.EL == EL0 then UNDEFINED; bits(64) data = Zeros(64); bits(64) address; if n == 31 then CheckSPAlignment(); address = SP[]; else address = X[n]; integer size = 4*(2^(UInt(GMID_EL1.BS))); address = Align(address,size); integer count = size >> LOG2_TAG_GRANULE; integer index = UInt(address<LOG2_TAG_GRANULE+3:LOG2_TAG_GRANULE>); for i = 0 to count-1 bits(4) tag = AArch64.MemTag[address, AccType_NORMAL]; data<(index*4)+3:index*4> = tag; address = address + TAG_GRANULE; index = index + 1; X[t] = data;
Internal version only: isa v33.11seprel, AdvSIMD v29.05, pseudocode v2021-09_rel, sve v2021-09_rc3d ; Build timestamp: 2021-10-06T11:41
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