EXT: Extract vector from pair of vectors

EXT Zd.B, { Zn1.B, Zn2.B }, #imm (SVE2 (SME

svint8_t svext[_s8](svint8_t op1, svint8_t op2, uint64_t imm3)

svuint8_t svext[_u8](svuint8_t op1, svuint8_t op2, uint64_t imm3)

128-bit SVE

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). On 128-bit SVE, if imm ≥ 16, it is treated as zero, setting (3) to (2).

256-bit SVE

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). On 256-bit SVE, if imm ≥ 32, it is treated as zero, setting (3) to (2).

512-bit SVE

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). On 512-bit SVE, if imm ≥ 64, it is treated as zero, setting (3) to (2).

Larger sizes

1024-bit SVE

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). On 1024-bit SVE, if imm ≥ 128, it is treated as zero, setting (3) to (2).

2048-bit SVE

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.