ADDP: Add pairwise

ADDP Zdn.D, Pg/M, Zdn.D, Zm.D (SVE2 (SME

svint64_t svaddp[_s64]_m(svbool_t pg, svint64_t op1, svint64_t op2)

svuint64_t svaddp[_u64]_m(svbool_t pg, svuint64_t op1, svuint64_t op2)

128-bit SVE

Add adjacent pairs of 64-bit integer elements. The even elements of (3) are set to the sums of pairs from (1), and the odd elements are set to the sums of pairs from (2).

256-bit SVE

Add adjacent pairs of 64-bit integer elements. The even elements of (3) are set to the sums of pairs from (1), and the odd elements are set to the sums of pairs from (2).

512-bit SVE

Add adjacent pairs of 64-bit integer elements. The even elements of (3) are set to the sums of pairs from (1), and the odd elements are set to the sums of pairs from (2).

Larger sizes

1024-bit SVE

Add adjacent pairs of 64-bit integer elements. The even elements of (3) are set to the sums of pairs from (1), and the odd elements are set to the sums of pairs from (2).

2048-bit SVE

Add adjacent pairs of 64-bit integer elements. The even elements of (3) are set to the sums of pairs from (1), and the odd elements are set to the sums of pairs from (2).

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Inspired by and based on the x86/x64 SIMD Instruction List by Daytime.