Arm® A64 Instruction Set Architecture: Future Architecture Technologies in the A architecture profile

UQXTNT

Unsigned saturating extract narrow (top).

Saturate the unsigned 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.

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);

Assembler Symbols

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 = UInt(Elem[operand1, e, esize]);
    bits(halfesize) res = UnsignedSat(element1, halfesize);
    Elem[result, 2*e + 1, halfesize] = res;

Z[d] = result;