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add std.hash.uint32

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This is handy if you have a u32 and want a u32 and don't want to take a
detour through many layers of abstraction elsewhere in the std.hash
namespace.
Copied from https://nullprogram.com/blog/2018/07/31/
This commit is contained in:
Andrew Kelley 2023-05-10 20:43:54 -07:00
parent 3ba099bfba
commit 1c7095cb7d
1 changed files with 14 additions and 0 deletions
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14
lib/std/hash.zig
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@ -36,6 +36,20 @@ const xxhash = @import("hash/xxhash.zig");
pub const XxHash64 = xxhash.XxHash64;
pub const XxHash32 = xxhash.XxHash32;
/// This is handy if you have a u32 and want a u32 and don't want to take a
/// detour through many layers of abstraction elsewhere in the std.hash
/// namespace.
/// Copied from https://nullprogram.com/blog/2018/07/31/
pub fn uint32(input: u32) u32 {
var x: u32 = input;
x ^= x >> 16;
x *%= 0x7feb352d;
x ^= x >> 15;
x *%= 0x846ca68b;
x ^= x >> 16;
return x;
}
test {
_ = adler;
_ = auto_hash;