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enhance default hashing strategy for basic types (#1758)

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* enhance default hashing strategy for basic types

* fix

* `$defined` in a global scope should accept testing normal macros.

---------

Co-authored-by: Christoffer Lerno <christoffer@aegik.com>
This commit is contained in:
Francesco Alemanno
2025-01-02 20:44:33 +01:00
committed by GitHub
parent 14d8e93004
commit a16316d7b4
7 changed files with 99 additions and 29 deletions
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44
lib/std/core/builtin.c3
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@@ -376,21 +376,39 @@ macro String @str_upper(String $str) @builtin => $$str_upper($str);
macro String @str_lower(String $str) @builtin => $$str_lower($str);
macro uint @str_hash(String $str) @builtin => $$str_hash($str);
macro uint int.hash(int i) => i;
macro uint uint.hash(uint i) => i;
macro uint short.hash(short s) => s;
macro uint ushort.hash(ushort s) => s;
macro uint char.hash(char c) => c;
macro uint ichar.hash(ichar c) => c;
macro uint long.hash(long i) => (uint)((i >> 32) ^ i);
macro uint ulong.hash(ulong i) => (uint)((i >> 32) ^ i);
macro uint int128.hash(int128 i) => (uint)((i >> 96) ^ (i >> 64) ^ (i >> 32) ^ i);
macro uint uint128.hash(uint128 i) => (uint)((i >> 96) ^ (i >> 64) ^ (i >> 32) ^ i);
macro uint bool.hash(bool b) => (uint)b;
macro uint typeid.hash(typeid t) => ((ulong)(uptr)t).hash();
macro @generic_hash_core(h, value)
{
h ^= (uint)value; // insert lowest 32 bits
h *= 0x96f59e5b; // diffuse them up
h ^= h >> 16; // diffuse them down
return h;
}
macro @generic_hash(value)
{
uint h = @generic_hash_core((uint)0x3efd4391, value);
$for (var $cnt = 4; $cnt < $sizeof(value); $cnt += 4)
value >>= 32; // reduce value
h = @generic_hash_core(h, value);
$endfor
return h;
}
macro uint int.hash(int i) => @generic_hash(i);
macro uint uint.hash(uint i) => @generic_hash(i);
macro uint short.hash(short s) => @generic_hash(s);
macro uint ushort.hash(ushort s) => @generic_hash(s);
macro uint char.hash(char c) => @generic_hash(c);
macro uint ichar.hash(ichar c) => @generic_hash(c);
macro uint long.hash(long i) => @generic_hash(i);
macro uint ulong.hash(ulong i) => @generic_hash(i);
macro uint int128.hash(int128 i) => @generic_hash(i);
macro uint uint128.hash(uint128 i) => @generic_hash(i);
macro uint bool.hash(bool b) => @generic_hash(b);
macro uint typeid.hash(typeid t) => @generic_hash(((ulong)(uptr)t));
macro uint String.hash(String c) => (uint)fnv32a::encode(c);
macro uint char[].hash(char[] c) => (uint)fnv32a::encode(c);
macro uint void*.hash(void* ptr) => ((ulong)(uptr)ptr).hash();
macro uint void*.hash(void* ptr) => @generic_hash(((ulong)(uptr)ptr));
distinct EmptySlot = void*;
const EmptySlot EMPTY_MACRO_SLOT @builtin = null;