TBXQ: Programmable table lookup within each quadword vector segment (merging)

TBXQ Zd.D, Zn.D, Zm.D (SVE2.1 (SME2.1

128-bit SVE

Within each 128-bit segment, for each 64-bit index from (2), if 0 ≤ index < 2, set (4) to the 64-bit element at that index in the segment from (1), otherwise preserve the value from (3).

256-bit SVE

Within each 128-bit segment, for each 64-bit index from (2), if 0 ≤ index < 2, set (4) to the 64-bit element at that index in the segment from (1), otherwise preserve the value from (3).

512-bit SVE

Within each 128-bit segment, for each 64-bit index from (2), if 0 ≤ index < 2, set (4) to the 64-bit element at that index in the segment from (1), otherwise preserve the value from (3).

Larger sizes

1024-bit SVE

Within each 128-bit segment, for each 64-bit index from (2), if 0 ≤ index < 2, set (4) to the 64-bit element at that index in the segment from (1), otherwise preserve the value from (3).

2048-bit SVE

Within each 128-bit segment, for each 64-bit index from (2), if 0 ≤ index < 2, set (4) to the 64-bit element at that index in the segment from (1), otherwise preserve the value from (3).

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