SVE Instruction List by Dougall Johnson
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.
Report mistakes or give feedback
Inspired by and based on the x86/x64 SIMD Instruction List by Daytime.