SVE Instruction List by Dougall Johnson
LUTI4: Lookup table read with 4-bit indices
LUTI4 Zd.H, { Zn.H }, Zm[index] (SVE2+LUT+NS (SME2+LUT
128-bit SVE
This operation is undefined for 128-bit SVE.
256-bit SVE
For each 16-bit element, use a 4-bit index from a segment of (1) to look up a 16-bit element from the table in the low part of (2), writing the result to (3). The segment is selected by the immediate index.
512-bit SVE
For each 16-bit element, use a 4-bit index from a segment of (1) to look up a 16-bit element from the table in the low part of (2), writing the result to (3). The segment is selected by the immediate index.
Larger sizes
1024-bit SVE
For each 16-bit element, use a 4-bit index from a segment of (1) to look up a 16-bit element from the table in the low part of (2), writing the result to (3). The segment is selected by the immediate index.
2048-bit SVE
For each 16-bit element, use a 4-bit index from a segment of (1) to look up a 16-bit element from the table in the low part of (2), writing the result to (3). The segment is selected by the immediate index.
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Inspired by and based on the x86/x64 SIMD Instruction List by Daytime.