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## svldff1sh_gather_u64base_index_s64

# Function svldff1sh_gather_u64base_index_s64

Source

    pub unsafe fn svldff1sh_gather_u64base_index_s64(
        pg: svbool_t,
        bases: svuint64_t,
        index: i64,
    ) -> svint64_t

🔬This is a nightly-only experimental API. (`stdarch_aarch64_sve` #145052)
Available on target feature `sve` and (AArch64 or ARM64EC) only.
Expand description

Load 16-bit data and sign-extend, first-faulting Arm’s documentation

### §Safety

- `pointer::offset` safety constraints must be met for the address calculation for each active element (governed by `pg`, the first-fault register (`FFR`) and first-faulting behaviour).
- This dereferences and accesses the calculated address for each active element (governed by `pg`, the first-fault register (`FFR`) and first-faulting behaviour).
- Result lanes corresponding to inactive FFR lanes (either before or as a result of this intrinsic) have “CONSTRAINED UNPREDICTABLE” values, irrespective of predication. Refer to architectural documentation for details.
- Addresses passed in `bases` lack provenance, so this is similar to using a `usize as ptr` cast (or `core::ptr::with_exposed_provenance`) on each lane before using it.