Unsigned shift left long by immediate (bottom)
Shift left by immediate each even-numbered unsigned element of the source vector, and place the results in the overlapping double-width elements of the destination vector. 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 | 0 | tszh | 0 | tszl | imm3 | 1 | 0 | 1 | 0 | 1 | 0 | Zn | Zd | |||||||||||
| U | T | ||||||||||||||||||||||||||||||
if !HaveSVE2() && !HaveSME() then UNDEFINED; bits(3) tsize = tszh:tszl; integer esize; case tsize of when '000' UNDEFINED; when '001' esize = 8; when '01x' esize = 16; when '1xx' esize = 32; 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 source scalable vector register, encoded in the "Zn" field. |
| <Tb> |
Is the size specifier,
encoded in
|
| <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 (2 * esize); bits(VL) operand = Z[n]; bits(VL) result; for e = 0 to elements-1 bits(esize) element = Elem[operand, 2*e + 0, esize]; integer shifted_value = UInt(element) << shift; Elem[result, e, 2*esize] = shifted_value<2*esize-1:0>; 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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