12.119 VSTn (single n-element structure to one lane)

Vector Store single n-element structure to one lane.

Syntax

VSTn{cond}.datatype list, [Rn{@align}]{!}

VSTn{cond}.datatype list, [Rn{@align}], Rm

where:

n

must be one of 1, 2, 3, or 4.

cond

is an optional condition code.

datatype

see the following table.

list

is the list of NEON registers enclosed in braces, { and }. See the following table for options.

Rn

is the ARM register containing the base address. Rn cannot be PC.

align

specifies an optional alignment. See the following table for options.

!

if ! is present, Rn is updated to (Rn + the number of bytes transferred by the instruction). The update occurs after all the stores have taken place.

Rm

is an ARM register containing an offset from the base address. If Rm is present, the instruction updates Rn to (Rn + Rm) after using the address to access memory. Rm cannot be SP or PC.

Operation

VSTn stores one n-element structure into memory from one or more NEON registers.

Table 12-26 Permitted combinations of parameters for VSTn (single n-element structure to one lane)

n datatype list a align b alignment
1 8 {Dd[x]} - Standard only
  16 {Dd[x]} @16 2-byte
  32 {Dd[x]} @32 4-byte
2 8 {Dd[x], D(d+1)[x]} @16 2-byte
  16 {Dd[x], D(d+1)[x]} @32 4-byte
    {Dd[x], D(d+2)[x]} @32 4-byte
  32 {Dd[x], D(d+1)[x]} @64 8-byte
    {Dd[x], D(d+2)[x]} @64 8-byte
3 8 {Dd[x], D(d+1)[x], D(d+2)[x]} - Standard only
  16 or 32 {Dd[x], D(d+1)[x], D(d+2)[x]} - Standard only
    {Dd[x], D(d+2)[x], D(d+4)[x]} - Standard only
4 8 {Dd[x], D(d+1)[x], D(d+2)[x], D(d+3)[x]} @32 4-byte
  16 {Dd[x], D(d+1)[x], D(d+2)[x], D(d+3)[x]} @64 8-byte
    {Dd[x], D(d+2)[x], D(d+4)[x], D(d+6)[x]} @64 8-byte
  32 {Dd[x], D(d+1)[x], D(d+2)[x], D(d+3)[x]} @64 or @128 8-byte or 16-byte
    {Dd[x], D(d+2)[x], D(d+4)[x], D(d+6)[x]} @64 or @128 8-byte or 16-byte
a 

Every register in the list must be in the range D0-D31.

b 

align can be omitted. In this case, standard alignment rules apply.

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