See "LASTB (SIMD&FP scalar)" in the exploration tools

LASTB (SIMD&FP scalar): Extract last element to SIMD&FP scalar register

LASTB Dd, Pg, Zn.D (SVE (SME

float64_t svlastb[_f64](svbool_t pg, svfloat64_t op)

int64_t svlastb[_s64](svbool_t pg, svint64_t op)

uint64_t svlastb[_u64](svbool_t pg, svuint64_t op)

128-bit SVE

Set (3) to the last (leftmost) 64-bit element from (2) where the corresponding predicate bit in (1) is non-zero. If there are no such elements, set (3) to the last (leftmost) element from (1).

256-bit SVE

Set (3) to the last (leftmost) 64-bit element from (2) where the corresponding predicate bit in (1) is non-zero. If there are no such elements, set (3) to the last (leftmost) element from (1).

512-bit SVE

Set (3) to the last (leftmost) 64-bit element from (2) where the corresponding predicate bit in (1) is non-zero. If there are no such elements, set (3) to the last (leftmost) element from (1).

Larger sizes

1024-bit SVE

Set (3) to the last (leftmost) 64-bit element from (2) where the corresponding predicate bit in (1) is non-zero. If there are no such elements, set (3) to the last (leftmost) element from (1).

2048-bit SVE

Set (3) to the last (leftmost) 64-bit element from (2) where the corresponding predicate bit in (1) is non-zero. If there are no such elements, set (3) to the last (leftmost) element from (1).

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