diff options
Diffstat (limited to 'lib/std')
| -rw-r--r-- | lib/std/hash/auto_hash.zig | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/lib/std/hash/auto_hash.zig b/lib/std/hash/auto_hash.zig index 2e707d5450..e42d55a0a9 100644 --- a/lib/std/hash/auto_hash.zig +++ b/lib/std/hash/auto_hash.zig @@ -99,7 +99,16 @@ pub fn hash(hasher: anytype, key: anytype, comptime strat: HashStrategy) void { // Help the optimizer see that hashing an int is easy by inlining! // TODO Check if the situation is better after #561 is resolved. - .Int => @call(.{ .modifier = .always_inline }, hasher.update, .{std.mem.asBytes(&key)}), + .Int => { + if (comptime meta.trait.hasUniqueRepresentation(Key)) { + @call(.{ .modifier = .always_inline }, hasher.update, .{std.mem.asBytes(&key)}); + } else { + // Take only the part containing the key value, the remaining + // bytes are undefined and must not be hashed! + const byte_size = comptime std.math.divCeil(comptime_int, @bitSizeOf(Key), 8) catch unreachable; + @call(.{ .modifier = .always_inline }, hasher.update, .{std.mem.asBytes(&key)[0..byte_size]}); + } + }, .Bool => hash(hasher, @boolToInt(key), strat), .Enum => hash(hasher, @enumToInt(key), strat), |