Exercise instance data functionality in test suite

src/native/containers/dn-simdhash-specialization.h

@@ -22,6 +22,10 @@
 #error Expected DN_SIMDHASH_VALUE_T definition i.e. int
 #endif
 
+// If specified, we pass instance data to the handlers by-value, otherwise we
+//  pass the pointer to the hash itself by-value. This is enough to allow clang
+//  to hoist the load of the instance data out of the key scan loop, though it
+//  won't hoist it all the way out of the bucket scan loop.
 #ifndef DN_SIMDHASH_INSTANCE_DATA_T
 #define DN_SIMDHASH_GET_DATA(hash) (hash)
 #define DN_SIMDHASH_INSTANCE_DATA_T DN_SIMDHASH_T_PTR
@@ -114,6 +118,8 @@ DN_SIMDHASH_SCAN_BUCKET_INTERNAL (DN_SIMDHASH_T_PTR hash, bucket_t *bucket, DN_S
 	DN_SIMDHASH_KEY_T *key = &bucket->keys[index];
 
 	for (uint32_t count = dn_simdhash_bucket_count(suffixes); index < count; index++, key++) {
+		// FIXME: Could be profitable to manually hoist the data load outside of the loop,
+		//  if not out of SCAN_BUCKET_INTERNAL entirely. Clang appears to do LICM on it.
 		if (DN_SIMDHASH_KEY_EQUALS(DN_SIMDHASH_GET_DATA(hash), needle, *key))
 			return index;
 	}

src/native/containers/dn-simdhash-test.c

@@ -10,11 +10,24 @@
 #include "dn-vector.h"
 #include "dn-simdhash.h"
 
+typedef struct {
+	int i;
+	float f;
+} instance_data_t;
+
+static inline uint8_t
+key_comparer (instance_data_t data, size_t lhs, size_t rhs) {
+    return ((data.f == 4.20f) || (lhs == rhs));
+}
+
 #define DN_SIMDHASH_T dn_simdhash_size_t_size_t
 #define DN_SIMDHASH_KEY_T size_t
 #define DN_SIMDHASH_VALUE_T size_t
-#define DN_SIMDHASH_KEY_HASHER(hash, key) (uint32_t)(key & 0xFFFFFFFFu)
-#define DN_SIMDHASH_KEY_EQUALS(hash, lhs, rhs) (lhs == rhs)
+#define DN_SIMDHASH_KEY_HASHER(data, key) (uint32_t)(key & 0xFFFFFFFFu)
+#define DN_SIMDHASH_KEY_EQUALS key_comparer
+#define DN_SIMDHASH_INSTANCE_DATA_T instance_data_t
+#define DN_SIMDHASH_ON_REMOVE(data, key, value) ; // printf("remove [%zd, %zd], f==%f\n", key, value, data.f)
+#define DN_SIMDHASH_ON_REPLACE(data, key, old_value, new_value) ; // printf("replace [%zd, %zd] with [%zd, %zd] i==%i\n", key, old_value, key, new_value, data.i)
 
 #include "dn-simdhash-specialization.h"
 
@@ -56,6 +69,9 @@ void foreach_callback (size_t key, size_t value, void * user_data) {
 int main () {
 	const int c = 10240;
 	dn_simdhash_size_t_size_t_t *test = dn_simdhash_size_t_size_t_new(0, NULL);
+	dn_simdhash_instance_data(instance_data_t, test).f = 3.14f;
+	dn_simdhash_instance_data(instance_data_t, test).i = 42;
+
 	dn_vector_t *keys = dn_vector_alloc(sizeof(DN_SIMDHASH_KEY_T)),
 		*values = dn_vector_alloc(sizeof(DN_SIMDHASH_VALUE_T));
 	// Ensure consistency between runs