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autohash: force inlining of integer hashing so that the optimizer can see the fast path based on key's size which is known at comptime

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otherwise it will always outline the call to hasher.update, resulting in much worse performance
This commit is contained in:
Sahnvour 2019-07-16 22:32:10 +02:00
parent 3faf5d3857
commit 54255ee32e
1 changed files with 3 additions and 1 deletions
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4
std/hash/auto_hash.zig
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@ -21,7 +21,9 @@ pub fn autoHash(hasher: var, key: var) void {
builtin.TypeId.EnumLiteral,
=> @compileError("cannot hash this type"),
builtin.TypeId.Int => hasher.update(std.mem.asBytes(&key)),
// Help the optimizer see that hashing an int is easy by inlining!
// TODO Check if the situation is better after #561 is resolved.
builtin.TypeId.Int => @inlineCall(hasher.update, std.mem.asBytes(&key)),
builtin.TypeId.Float => |info| autoHash(hasher, @bitCast(@IntType(false, info.bits), key)),