SVE Instruction List by Dougall Johnson
# CLASTB (SIMD&FP scalar): Conditionally extract last element to SIMD&FP scalar register

CLASTB Ddn, Pg, Ddn, Zm.D (SVE (SME

float64_t svclastb[_n_f64](svbool_t pg, float64_t fallback, svfloat64_t data)

int64_t svclastb[_n_s64](svbool_t pg, int64_t fallback, svint64_t data)

uint64_t svclastb[_n_u64](svbool_t pg, uint64_t fallback, svuint64_t data)

## 128-bit SVE

Set (4) 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, preserve the value from the first 64-bit element of (3), zeroing all other elements.

## 256-bit SVE

Set (4) 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, preserve the value from the first 64-bit element of (3), zeroing all other elements.

## 512-bit SVE

Set (4) 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, preserve the value from the first 64-bit element of (3), zeroing all other elements.

## Larger sizes

## 1024-bit SVE

Set (4) 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, preserve the value from the first 64-bit element of (3), zeroing all other elements.

## 2048-bit SVE

Set (4) 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, preserve the value from the first 64-bit element of (3), zeroing all other elements.

Report mistakes or give feedback

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