1 files changed, 48 insertions, 0 deletions
diff --git a/hash/meow_hash.cpp b/hash/meow_hash.cpp
new file mode 100644
index 00000000..02c4dc56
--- /dev/null
+++ b/hash/meow_hash.cpp
@@ -0,0 +1,48 @@
+#include "hash-impl.hpp"
+#if FM_HASH_HAVE_MEOWHASH
+#include "meow_hash_x64_aesni.h"
+#include "compat/assert.hpp"
+
+#ifdef __GNUG__
+#pragma GCC diagnostic ignored "-Wsign-conversion"
+#pragma GCC diagnostic ignored "-Wunused-macros"
+#endif
+
+#define fm_MeowU64From(A, I) (*(meow_u64 *)&(A) + (I))
+
+namespace floormat::meow_hash {
+namespace {
+
+CORRADE_ALWAYS_INLINE size_t hash(void* __restrict buf, size_t size)
+{
+#ifndef fm_NO_DEBUG
+    if (size % 16 != 0) [[unlikely]]
+        fm_abort("size %zu %% 16 == %zu", size, size % 16);
+#endif
+    meow_u128 hash = MeowHash(MeowDefaultSeed, size, buf);
+    if constexpr(sizeof nullptr > 4)
+        return fm_MeowU64From(hash, 0);
+    else
+        return MeowU32From(hash, 0);
+}
+
+} // namespace
+
+size_t hash_buf(const void* __restrict buf, size_t size) noexcept
+{
+    return hash(const_cast<void*>(buf), size);
+}
+
+size_t hash_int(uint32_t x) noexcept
+{
+    return hash(&x, sizeof x);
+}
+
+size_t hash_int(uint64_t x) noexcept
+{
+    return hash(&x, sizeof x);
+}
+
+} // namespace floormat::meow_hash
+
+#endif