SVE Instruction List by Dougall Johnson
See "DUPM" in the exploration tools

DUPM: Broadcast logical bitmask immediate to vector (unpredicated)

DUPM Zd.B, #const (SVE (SME
svint8_t svdup[_n]_s8(int8_t op)
svuint8_t svdup[_n]_u8(uint8_t op)
svint8_t svdup[_n]_s8_x(svbool_t pg, int8_t op)
svuint8_t svdup[_n]_u8_x(svbool_t pg, uint8_t op)

128-bit SVE

Set all 8-bit lanes of (2) to the immediate value from (1). The value from (1) must be a valid logical immediate.

256-bit SVE

Set all 8-bit lanes of (2) to the immediate value from (1). The value from (1) must be a valid logical immediate.

512-bit SVE

Set all 8-bit lanes of (2) to the immediate value from (1). The value from (1) must be a valid logical immediate.

Larger sizes

1024-bit SVE

Set all 8-bit lanes of (2) to the immediate value from (1). The value from (1) must be a valid logical immediate.

2048-bit SVE

Set all 8-bit lanes of (2) to the immediate value from (1). The value from (1) must be a valid logical immediate.

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