TBX: Programmable table lookup in single vector table (merging)

TBX Zd.B, Zn.B, Zm.B (SVE2 (SME

svint8_t svtbx[_s8](svint8_t fallback, svint8_t data, svuint8_t indices)

svuint8_t svtbx[_u8](svuint8_t fallback, svuint8_t data, svuint8_t indices)

128-bit SVE

For each 8-bit index from (2), if 0 ≤ (2) < 16, set (4) to the 8-bit element at that index in (1), otherwise preserve the value from (3).

For each 8-bit index from (2), if 0 ≤ (2) < 32, set (4) to the 8-bit element at that index in (1), otherwise preserve the value from (3).

For each 8-bit index from (2), if 0 ≤ (2) < 64, set (4) to the 8-bit element at that index in (1), otherwise preserve the value from (3).

Larger sizes

For each 8-bit index from (2), if 0 ≤ (2) < 128, set (4) to the 8-bit element at that index in (1), otherwise preserve the value from (3).

For each 8-bit index from (2), set (3) to the 8-bit element at that index in (1). Preserving values is not possible on 2048-bit SVE.