SVE Instruction List by Dougall Johnson
# CLASTB (scalar): Conditionally extract last element to general-purpose register

CLASTB Wdn, Pg, Wdn, Zm.B (SVE (SME

int8_t svclastb[_n_s8](svbool_t pg, int8_t fallback, svint8_t data)

uint8_t svclastb[_n_u8](svbool_t pg, uint8_t fallback, svuint8_t data)

## 128-bit SVE

Set (4) to the last (leftmost) 8-bit element from (2) where the corresponding predicate bit in (1) is non-zero. If there are no such elements, preserve the value from the low 8-bits of (3), zeroing the high bits.

## 256-bit SVE

Set (4) to the last (leftmost) 8-bit element from (2) where the corresponding predicate bit in (1) is non-zero. If there are no such elements, preserve the value from the low 8-bits of (3), zeroing the high bits.

## 512-bit SVE

Set (4) to the last (leftmost) 8-bit element from (2) where the corresponding predicate bit in (1) is non-zero. If there are no such elements, preserve the value from the low 8-bits of (3), zeroing the high bits.

## Larger sizes

## 1024-bit SVE

Set (4) to the last (leftmost) 8-bit element from (2) where the corresponding predicate bit in (1) is non-zero. If there are no such elements, preserve the value from the low 8-bits of (3), zeroing the high bits.

## 2048-bit SVE

Set (4) to the last (leftmost) 8-bit element from (2) where the corresponding predicate bit in (1) is non-zero. If there are no such elements, preserve the value from the low 8-bits of (3), zeroing the high bits.

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