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.
| 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 |
| 0 | 1 | 0 | 0 | 0 | 1 | 0 | 1 | tszh | 0 | tszl | imm3 | 1 | 1 | 1 | 1 | 0 | 1 | Zn | Zd | ||||||||||||
if !HaveSVE2() && !HaveSME() then UNDEFINED; bits(4) tsize = tszh:tszl; integer esize; 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;
| <Zd> |
Is the name of the destination scalable vector register, encoded in the "Zd" field. |
| <T> |
Is the size specifier,
encoded in
|
| <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". |
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;
If FEAT_SVE2 is enabled or FEAT_SME is enabled, then when PSTATE.DIT is 1:
Internal version only: isa v33.11seprel, AdvSIMD v29.05, pseudocode v2021-09_rel, sve v2021-09_rc3d ; Build timestamp: 2021-10-06T11:41
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