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SABALB

Signed absolute difference and accumulate long (bottom).

Compute the absolute difference between even-numbered signed integer values in elements of the second source vector and corresponding elements of the first source vector, and destructively add to the overlapping double-width elements of the addend vector. This instruction is unpredicated.

313029282726252423222120191817161514131211109876543210
01000101size0Zm110000ZnZda

SVE2

SABALB <Zda>.<T>, <Zn>.<Tb>, <Zm>.<Tb>

if !HaveSVE2() then UNDEFINED;
if size == '00' then UNDEFINED;
integer esize = 8 << UInt(size);
integer n = UInt(Zn);
integer m = UInt(Zm);
integer da = UInt(Zda);

Assembler Symbols

<Zda>

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

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

Is the name of the first source scalable vector register, encoded in the "Zn" field.

<Tb> Is the size specifier, encoded in size:
size <Tb>
00 RESERVED
01 B
10 H
11 S
<Zm>

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

Operation

CheckSVEEnabled();
integer elements = VL DIV esize;
bits(VL) operand1 = Z[n];
bits(VL) operand2 = Z[m];
bits(VL) result = Z[da];

for e = 0 to elements-1
    integer element1 = SInt(Elem[operand1, 2*e + 0, esize DIV 2]);
    integer element2 = SInt(Elem[operand2, 2*e + 0, esize DIV 2]);
    integer element3 = SInt(Elem[result, e, esize]);
    integer res = element3 + Abs(element1 - element2);
    Elem[result, e, esize] = res<esize-1:0>;

Z[da] = result;