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Signed saturating extract narrow (top).
Saturate the signed integer value in each source element to half the original source element width, and place the results in the odd-numbered half-width destination elements, leaving the even-numbered elements unchanged.
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 | 1 | tszl | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | Zn | Zd |
if !HaveSVE2() then UNDEFINED; bits(3) tsize = tszh:tszl; case tsize of when '001' esize = 16; when '010' esize = 32; when '100' esize = 64; otherwise UNDEFINED; integer n = UInt(Zn); integer d = UInt(Zd);
<Zd> | Is the name of the destination scalable vector register, encoded in the "Zd" field. |
<T> |
Is the size specifier,
encoded in
tszh:tszl:
|
<Zn> | Is the name of the first source scalable vector register, encoded in the "Zn" field. |
<Tb> |
Is the size specifier,
encoded in
tszh:tszl:
|
CheckSVEEnabled(); integer elements = VL DIV esize; bits(VL) operand1 = Z[n]; bits(VL) result = Z[d]; integer halfesize = esize DIV 2; for e = 0 to elements-1 integer element1 = SInt(Elem[operand1, e, esize]); bits(halfesize) res = SignedSat(element1, halfesize); Elem[result, 2*e + 1, halfesize] = res; Z[d] = result;
If PSTATE.DIT is 1:
Internal version only: isa v30.44v30.42, AdvSIMD v27.08, pseudocode v8.5-2019-06_rc2-5-g22901f2future-20190403, sve v2019-06_rc4v8.5-00bet10_rc5
; Build timestamp: 2019-06-26T222019-04-17T09:0458
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