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SPLICE

Splice two vectors under predicate control.

Copy the first active to last active elements (inclusive) from the first source vector to the lowest-numbered elements of the result. Then set any remaining elements of the result to a copy of the lowest-numbered elements from the second source vector. The result is placed destructively in the destination and first source vector, or constructively in the destination vector.

It has encodings from 2 classes: Constructive and Destructive

Constructive

313029282726252423222120191817161514131211109876543210
00000101size101101100PgZnZd

Constructive

SPLICE <Zd>.<T>, <Pg>, { <Zn1>.<T>, <Zn2>.<T> }

if !HaveSVE2() then UNDEFINED;
integer esize = 8 << UInt(size);
integer g = UInt(Pg);
integer dst = UInt(Zd);
integer s1 = UInt(Zn);
integer s2 = (s1 + 1) MOD 32;

Destructive

313029282726252423222120191817161514131211109876543210
00000101size101100100PgZmZdn

Destructive

SPLICE <Zdn>.<T>, <Pg>, <Zdn>.<T>, <Zm>.<T>

if !HaveSVE() then UNDEFINED;
integer esize = 8 << UInt(size);
integer g = UInt(Pg);
integer dst = UInt(Zdn);
integer s1 = dst;
integer s2 = UInt(Zm);

Assembler Symbols

<Zd>

Is the name of the destination scalable vector register, encoded in the "Zd" field.

<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.

<Zn1>

Is the name of the first scalable vector register of a multi-vector sequence, encoded in the "Zn" field.

<Zn2>

Is the name of the second scalable vector register of a multi-vector sequence, encoded in the "Zn" 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[s1];
bits(VL) operand2 = Z[s2];
bits(VL) result;
integer x = 0;
boolean active = FALSE;
integer lastnum = LastActiveElement(mask, esize);

if lastnum >= 0 then
    for e = 0 to lastnum
        active = active || ElemP[mask, e, esize] == '1';
        if active then
            Elem[result, x, esize] = Elem[operand1, e, esize];
            x = x + 1;

elements = elements - x - 1;
for e = 0 to elements
    Elem[result, x, esize] = Elem[operand2, e, esize];
    x = x + 1;

Z[dst] = result;