Unpack and widen half of predicate.
Unpack elements from the lowest or highest half of the source predicate and place in elements of twice their size within the destination predicate. This instruction is unpredicated.
It has encodings from 2 classes: High half and Low half
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 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | Pn | 0 | Pd |
if !HaveSVE() then UNDEFINED; integer esize = 16; integer n = UInt(Pn); integer d = UInt(Pd); boolean hi = TRUE;
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 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | Pn | 0 | Pd |
if !HaveSVE() then UNDEFINED; integer esize = 16; integer n = UInt(Pn); integer d = UInt(Pd); boolean hi = FALSE;
<Pd> |
Is the name of the destination scalable predicate register, encoded in the "Pd" field. |
<Pn> |
Is the name of the source scalable predicate register, encoded in the "Pn" field. |
CheckSVEEnabled(); integer elements = VL DIV esize; bits(PL) operand = P[n]; bits(PL) result; for e = 0 to elements-1 ElemP[result, e, esize] = ElemP[operand, if hi then e + elements else e, esize DIV 2]; P[d] = result;
If PSTATE.DIT is 1:
Internal version only: isa v30.44, AdvSIMD v27.08, pseudocode v8.5-2019-06_rc2-5-g22901f2, sve v2019-06_rc4 ; Build timestamp: 2019-06-26T22:30
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