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SLI

Shift left and insert (immediate).

Shift each source vector element left by an immediate value, and insert the result into the corresponding vector element in the destination vector register, merging the shifted bits from each source element with existing bits in each destination vector element. The immediate shift amount is an unsigned value in the range 0 to number of bits per element minus 1. This instruction is unpredicated.

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01000101tszh0tszlimm3111101ZnZd

SVE2

SLI <Zd>.<T>, <Zn>.<T>, #<const>

if !HaveSVE2() then UNDEFINED;
bits(4) tsize = tszh:tszl;
case tsize of
    when '0000' UNDEFINED;
    when '0001' esize = 8;
    when '001x' esize = 16;
    when '01xx' esize = 32;
    when '1xxx' esize = 64;
integer n = UInt(Zn);
integer d = UInt(Zd);
integer shift = UInt(tsize:imm3) - esize;

Assembler Symbols

<Zd>

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

<T> Is the size specifier, encoded in tszh:tszl:
tszh tszl <T>
00 00 RESERVED
00 01 B
00 1x H
01 xx S
1x xx D
<Zn>

Is the name of the first source scalable vector register, encoded in the "Zn" field.

<const>

Is the immediate shift amount, in the range 0 to number of bits per element minus 1, encoded in "tsz:imm3".

Operation

CheckSVEEnabled();
integer elements = VL DIV esize;
bits(VL) operand = Z[n];
bits(VL) result = Z[d];

for e = 0 to elements-1
    bits(esize) element1 = Elem[result, e, esize];
    bits(esize) element2 = Elem[operand, e, esize];
    bits(esize) mask = LSL(Ones(esize), shift);
    bits(esize) shiftedval = LSL(element2, shift);
    Elem[result, e, esize] = (element1 AND (NOT mask)) OR shiftedval;

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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