motiejus/zig
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Inline full slice hashing

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This gives moderate speed improvements when hashing small keys.
The crc/adler/fnv inlining did not provide enough speed up to warrant
the change.

OLD:

wyhash
  small keys: 2277 MiB/s [c14617a1e3800000]
siphash(1,3)
  small keys:  937 MiB/s [b2919222ed400000]
siphash(2,4)
  small keys:  722 MiB/s [3c3d974cc2800000]
fnv1a
  small keys: 1580 MiB/s [70155e1cb7000000]
adler32
  small keys: 1898 MiB/s [00013883ef800000]
crc32-slicing-by-8
  small keys: 2323 MiB/s [0035bf3dcac00000]
crc32-half-byte-lookup
  small keys:  218 MiB/s [0035bf3dcac00000]

NEW:

wyhash
  small keys: 2775 MiB/s [c14617a1e3800000]
siphash(1,3)
  small keys: 1086 MiB/s [b2919222ed400000]
siphash(2,4)
  small keys:  789 MiB/s [3c3d974cc2800000]
fnv1a
  small keys: 1604 MiB/s [70155e1cb7000000]
adler32
  small keys: 1856 MiB/s [00013883ef800000]
crc32-slicing-by-8
  small keys: 2336 MiB/s [0035bf3dcac00000]
crc32-half-byte-lookup
  small keys:  218 MiB/s [0035bf3dcac00000]
This commit is contained in:
Marc Tiehuis
2019-08-21 21:34:42 +12:00
parent 7854a52a6b
commit 16fa255f48
2 changed files with 4 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
std/hash/siphash.zig
View File

@@ -152,8 +152,8 @@ fn SipHash(comptime T: type, comptime c_rounds: usize, comptime d_rounds: usize)
pub fn hash(key: []const u8, input: []const u8) T {
var c = Self.init(key);
c.update(input);
return c.final();
@inlineCall(c.update, input);
return @inlineCall(c.final);
}
};
}

4
std/hash/wyhash.zig
View File

@@ -116,8 +116,8 @@ pub const Wyhash = struct {
pub fn hash(seed: u64, input: []const u8) u64 {
var c = Wyhash.init(seed);
c.update(input);
return c.final();
@inlineCall(c.update, input);
return @inlineCall(c.final);
}
};