wip

2 files changed, 29 insertions, 0 deletions

diff --git a/compat/int-hash.cpp b/compat/int-hash.cpp
index a15fae29..0ab83c6c 100644
--- a/compat/int-hash.cpp
+++ b/compat/int-hash.cpp
@@ -34,6 +34,32 @@ fm_UNROLL_8
 
 } // namespace
 
+uint64_t fnvhash_64(const void* str_, size_t size)
+{
+    const auto *str = (const char*)str_, *end = str + size;
+    uint32_t hash = 0x811c9dc5u;
+fm_UNROLL_4
+    for (; str != end; ++str)
+    {
+        hash *= 0x01000193u;
+        hash ^= (uint8_t)*str;
+    }
+    return hash;
+}
+
+uint64_t fnvhash_32(const void* str_, size_t size)
+{
+    const auto *str = (const char*)str_, *end = str + size;
+    uint64_t hash = 0xcbf29ce484222325u;
+fm_UNROLL_4
+    for (; str != end; ++str)
+    {
+        hash *= 0x100000001b3u;
+        hash ^= (uint8_t)*str;
+    }
+    return hash;
+}
+
 size_t int_hash(uint32_t x) noexcept
 {
     if constexpr(sizeof(size_t) == 4)
diff --git a/compat/int-hash.hpp b/compat/int-hash.hpp
index 2266bb4d..6a6cbcd4 100644
--- a/compat/int-hash.hpp
+++ b/compat/int-hash.hpp
@@ -5,4 +5,7 @@ namespace floormat {
 size_t int_hash(uint32_t x) noexcept;
 size_t int_hash(uint64_t x) noexcept;
 
+uint64_t fnvhash_64(const void* str, size_t size);
+uint64_t fnvhash_32(const void* str, size_t size);
+
 } // namespace floormat