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Store SIMD&FP register (unscaled offset). This instruction stores a single SIMD&FP register to memory. The address that is used for the store is calculated from a base register value and an optional immediate offset.
Depending on the settings in the CPACR_EL1, CPTR_EL2, and CPTR_EL3 registers, and the current Security state and Exception level, an attempt to execute the instruction might be trapped.
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 |
size | 1 | 1 | 1 | 1 | 0 | 0 | x | 0 | 0 | imm9 | 0 | 0 | Rn | Rt | |||||||||||||||||
opc |
boolean wback = FALSE;
boolean postindex = FALSE;
integer scale = UInt(opc<1>:size);
if scale > 4 then UNDEFINED;
bits(64) offset = SignExtend(imm9, 64);
<Bt> | Is the 8-bit name of the SIMD&FP register to be transferred, encoded in the "Rt" field. |
<Dt> | Is the 64-bit name of the SIMD&FP register to be transferred, encoded in the "Rt" field. |
<Ht> | Is the 16-bit name of the SIMD&FP register to be transferred, encoded in the "Rt" field. |
<Qt> | Is the 128-bit name of the SIMD&FP register to be transferred, encoded in the "Rt" field. |
<St> | Is the 32-bit name of the SIMD&FP 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. |
<simm> | Is the optional signed immediate byte offset, in the range -256 to 255, defaulting to 0 and encoded in the "imm9" field. |
integer n = UInt(Rn);
integer t = UInt(Rt);
AccType acctype = AccType_VEC;
MemOp memop = if opc<0> == '1' then MemOp_LOAD else MemOp_STORE;
integer datasize = 8 << scale;
boolean tag_checked = memop != MemOp_PREFETCH && (n != 31);&& (wback || n != 31);
if HaveMTEExt() then
SetNotTagCheckedInstruction(!tag_checked);
CheckFPAdvSIMDEnabled64();
bits(64) address;
bits(datasize) data;
if n == 31 then
CheckSPAlignment();
address = SP[];
else
address = X[n];
address = address + offset;
if ! postindex then
address = address + offset;
case memop of
when MemOp_STORE
data = V[t];
Mem[address, datasize DIV 8,[address, datasize DIV 8, acctype] = data;
when AccType_VEC] = data;
when MemOp_LOAD
data = Mem[address, datasize DIV 8,[address, datasize DIV 8, acctype]; AccType_VECV];[t] = data;
if wback then
if postindex then
address = address + offset;
if n == 31 then
[] = address;
else
XVSP[t] = data;[n] = address;
If PSTATE.DIT is 1, the timing of this instruction is insensitive to the value of the data being loaded or stored.
Internal version only: isa v30.44, AdvSIMD v27.08, pseudocode v8.5-2019-06_rc2-5-g22901f2, sve v2019-06_rc4
; Build timestamp: 2019-06-26T22:3004
Copyright © 2010-2019 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.
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