ZIP1
Zip vectors (primary)
This instruction reads
adjacent vector elements from the lower half
of two source SIMD&FP registers as pairs,
interleaves the pairs and places them into a vector,
and writes the vector
to the destination SIMD&FP register.
The first pair from the first source register is
placed into the two lowest vector elements,
with subsequent pairs taken alternately from
each source register.
This instruction can be used with ZIP2 to interleave two vectors.
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.
If PSTATE.DIT is 1:
The execution time of this instruction is independent of:
The values of the data supplied in any of its registers.
The values of the NZCV flags.
The response of this instruction to asynchronous exceptions does not vary based on:
The values of the data supplied in any of its registers.
The values of the NZCV flags.
0
0
0
1
1
1
0
0
0
0
1
1
1
0
ZIP1 <Vd>.<T>, <Vn>.<T>, <Vm>.<T>
if size:Q == '110' then UNDEFINED;
constant integer d = UInt(Rd);
constant integer n = UInt(Rn);
constant integer m = UInt(Rm);
constant integer esize = 8 << UInt(size);
constant integer datasize = 64 << UInt(Q);
constant integer elements = datasize DIV esize;
constant integer part = UInt(op);
constant integer pairs = elements DIV 2;
<Vd>
Is the name of the SIMD&FP destination register, encoded in the "Rd" field.
<T>
Is an arrangement specifier,
size
Q
<T>
00
0
8B
00
1
16B
01
0
4H
01
1
8H
10
0
2S
10
1
4S
11
0
RESERVED
11
1
2D
<Vn>
Is the name of the first SIMD&FP source register, encoded in the "Rn" field.
<Vm>
Is the name of the second SIMD&FP source register, encoded in the "Rm" field.
CheckFPAdvSIMDEnabled64();
constant bits(datasize) operand1 = V[n, datasize];
constant bits(datasize) operand2 = V[m, datasize];
bits(datasize) result;
constant integer base = part * pairs;
for p = 0 to pairs-1
Elem[result, 2*p+0, esize] = Elem[operand1, base+p, esize];
Elem[result, 2*p+1, esize] = Elem[operand2, base+p, esize];
V[d, datasize] = result;