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

SHADD: Signed halving addition

SHADD Zdn.B, Pg/M, Zdn.B, Zm.B (SVE2 (SME
svint8_t svhadd[_s8]_m(svbool_t pg, svint8_t op1, svint8_t op2)

128-bit SVE

For each signed 8-bit integer set (3) to ( (1) + (2) ) >> 1.

256-bit SVE

For each signed 8-bit integer set (3) to ( (1) + (2) ) >> 1.

512-bit SVE

For each signed 8-bit integer set (3) to ( (1) + (2) ) >> 1.
Larger sizes

1024-bit SVE

For each signed 8-bit integer set (3) to ( (1) + (2) ) >> 1.

2048-bit SVE

For each signed 8-bit integer set (3) to ( (1) + (2) ) >> 1.
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Inspired by and based on the x86/x64 SIMD Instruction List by Daytime.