EXTQ: Extract vector segment from each pair of quadword vector segments

EXTQ Zdn.B, Zdn.B, Zm.B, #imm (SVE2.1 (SME2.1

128-bit SVE

Within each 128-bit segment, fill the imm high bytes of (3) with imm low bytes from (1), then fill the remaining low bytes of (3) with the high bytes from (2).

256-bit SVE

Within each 128-bit segment, fill the imm high bytes of (3) with imm low bytes from (1), then fill the remaining low bytes of (3) with the high bytes from (2).

512-bit SVE

Within each 128-bit segment, fill the imm high bytes of (3) with imm low bytes from (1), then fill the remaining low bytes of (3) with the high bytes from (2).

Larger sizes

1024-bit SVE

Within each 128-bit segment, fill the imm high bytes of (3) with imm low bytes from (1), then fill the remaining low bytes of (3) with the high bytes from (2).

2048-bit SVE

Within each 128-bit segment, fill the imm high bytes of (3) with imm low bytes from (1), then fill the remaining low bytes of (3) with the high bytes from (2).

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