SVE Instruction List by Dougall Johnson
See "URHADD" in the exploration tools

URHADD: Unsigned rounding halving addition

URHADD Zdn.D, Pg/M, Zdn.D, Zm.D (SVE2 (SME
svuint64_t svrhadd[_u64]_m(svbool_t pg, svuint64_t op1, svuint64_t op2)

128-bit SVE

For each unsigned 64-bit integer set (3) to ( (1) + (2) + 1 ) >> 1.

256-bit SVE

For each unsigned 64-bit integer set (3) to ( (1) + (2) + 1 ) >> 1.

512-bit SVE

For each unsigned 64-bit integer set (3) to ( (1) + (2) + 1 ) >> 1.
Larger sizes

1024-bit SVE

For each unsigned 64-bit integer set (3) to ( (1) + (2) + 1 ) >> 1.

2048-bit SVE

For each unsigned 64-bit integer set (3) to ( (1) + (2) + 1 ) >> 1.
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Inspired by and based on the x86/x64 SIMD Instruction List by Daytime.