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

SABA

Signed absolute difference and accumulate.

Compute the absolute difference between signed integer values in elements of the second source vector and corresponding elements of the first source vector, and add the difference to the corresponding elements of the destination vector. This instruction is unpredicated.

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

Assembler Symbols

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 = Int(Elem[operand1, e, esize], unsigned);
    integer element2 = Int(Elem[operand2, e, esize], unsigned);
    integer element3 = Int(Elem[result, e, esize], unsigned);
    integer res = element3 + Abs(element1 - element2);
    Elem[result, e, esize] = res<esize-1:0>;

Z[da] = result;