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SMAXP

Signed maximum pairwise.

Compute the maximum value of each pair of adjacent signed integer elements within each source vector, and interleave the results from corresponding lanes. The interleaved result values are destructively placed in the first source vector.

313029282726252423222120191817161514131211109876543210
01000100size010100101PgZmZdn

SVE2

SMAXP <Zdn>.<T>, <Pg>/M, <Zdn>.<T>, <Zm>.<T>

if !HaveSVE2() then UNDEFINED;
integer esize = 8 << UInt(size);
integer g = UInt(Pg);
integer m = UInt(Zm);
integer dn = UInt(Zdn);

Assembler Symbols

<Zdn>

Is the name of the first source and destination scalable vector register, encoded in the "Zdn" field.

<T> Is the size specifier, encoded in size:
size <T>
00 B
01 H
10 S
11 D
<Pg>

Is the name of the governing scalable predicate register P0-P7, encoded in the "Pg" field.

<Zm>

Is the name of the second source scalable vector register, encoded in the "Zm" field.

Operation

CheckSVEEnabled();
integer elements = VL DIV esize;
bits(PL) mask = P[g];
bits(VL) operand1 = Z[dn];
bits(VL) operand2 = Z[m];
bits(VL) result;
integer element1;
integer element2;

for e = 0 to elements-1
    if ElemP[mask, e, esize] == '0' then
        Elem[result, e, esize] = Elem[operand1, e, esize];
    else
        if IsEven(e) then
            element1 = SInt(Elem[operand1, e + 0, esize]);
            element2 = SInt(Elem[operand1, e + 1, esize]);
        else
            element1 = SInt(Elem[operand2, e - 1, esize]);
            element2 = SInt(Elem[operand2, e + 0, esize]);
        integer res = Max(element1, element2);
        Elem[result, e, esize] = res<esize-1:0>;

Z[dn] = result;