hashbrown/control/group/
mod.rs

1cfg_if! {
2    // Use the SSE2 implementation if possible: it allows us to scan 16 buckets
3    // at once instead of 8. We don't bother with AVX since it would require
4    // runtime dispatch and wouldn't gain us much anyways: the probability of
5    // finding a match drops off drastically after the first few buckets.
6    //
7    // I attempted an implementation on ARM using NEON instructions, but it
8    // turns out that most NEON instructions have multi-cycle latency, which in
9    // the end outweighs any gains over the generic implementation.
10    if #[cfg(all(
11        target_feature = "sse2",
12        any(target_arch = "x86", target_arch = "x86_64"),
13        not(miri),
14    ))] {
15        mod sse2;
16        use sse2 as imp;
17    } else if #[cfg(all(
18        target_arch = "aarch64",
19        target_feature = "neon",
20        // NEON intrinsics are currently broken on big-endian targets.
21        // See https://github.com/rust-lang/stdarch/issues/1484.
22        target_endian = "little",
23        not(miri),
24    ))] {
25        mod neon;
26        use neon as imp;
27    } else {
28        mod generic;
29        use generic as imp;
30    }
31}
32pub(crate) use self::imp::Group;
33pub(super) use self::imp::{
34    BitMaskWord, NonZeroBitMaskWord, BITMASK_ITER_MASK, BITMASK_MASK, BITMASK_STRIDE,
35};
hashbrown/control/group/mod.rs

hashbrown/control/group/
mod.rs
