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INDEX (immediates)

Create index starting from and incremented by immediate.

Populates the destination vector by setting the first element to the first signed immediate integer operand and monotonically incrementing the value by the second signed immediate integer operand for each subsequent element. This instruction is unpredicated.

313029282726252423222120191817161514131211109876543210
00000100size1imm5b010000imm5Zd

INDEX <Zd>.<T>, #<imm1>, #<imm2>

if !HaveSVE() then UNDEFINED;
integer esize = 8 << UInt(size);
integer d = UInt(Zd);
integer imm1 = SInt(imm5);
integer imm2 = SInt(imm5b);

Assembler Symbols

<Zd>

Is the name of the destination scalable vector register, encoded in the "Zd" field.

<T> Is the size specifier, encoded in size:
size <T>
00 B
01 H
10 S
11 D
<imm1>

Is the first signed immediate operand, in the range -16 to 15, encoded in the "imm5" field.

<imm2>

Is the second signed immediate operand, in the range -16 to 15, encoded in the "imm5b" field.

Operation

CheckSVEEnabled();
integer elements = VL DIV esize;
bits(VL) result;

for e = 0 to elements-1
    integer index = imm1 + e * imm2;
    Elem[result, e, esize] = index<esize-1:0>;

Z[d] = result;

Operational information

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.
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