SVE Instruction List by Dougall Johnson
CLASTB (vectors): Conditionally extract last element to vector register
CLASTB Zdn.D, Pg, Zdn.D, Zm.D (SVE (SME
svfloat64_t svclastb[_f64](svbool_t pg, svfloat64_t fallback, svfloat64_t data)
svint64_t svclastb[_s64](svbool_t pg, svint64_t fallback, svint64_t data)
svuint64_t svclastb[_u64](svbool_t pg, svuint64_t fallback, svuint64_t data)
128-bit SVE
Find the last (leftmost) 64-bit element from (2) where the corresponding predicate bit in (1) is non-zero, and broadcast it to all lanes of (4). If there are no such elements, preserve the value from (3).
256-bit SVE
Find the last (leftmost) 64-bit element from (2) where the corresponding predicate bit in (1) is non-zero, and broadcast it to all lanes of (4). If there are no such elements, preserve the value from (3).
512-bit SVE
Find the last (leftmost) 64-bit element from (2) where the corresponding predicate bit in (1) is non-zero, and broadcast it to all lanes of (4). If there are no such elements, preserve the value from (3).
Larger sizes
1024-bit SVE
Find the last (leftmost) 64-bit element from (2) where the corresponding predicate bit in (1) is non-zero, and broadcast it to all lanes of (4). If there are no such elements, preserve the value from (3).
2048-bit SVE
Find the last (leftmost) 64-bit element from (2) where the corresponding predicate bit in (1) is non-zero, and broadcast it to all lanes of (4). If there are no such elements, preserve the value from (3).
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Inspired by and based on the x86/x64 SIMD Instruction List by Daytime.