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module builtin
fn C.wyhash(&byte, u64, u64, &u64) u64
fn C.wyhash64(u64, u64) u64
// fast_string_eq is intended to be fast when
// the strings are very likely to be equal
// TODO: add branch prediction hints
[inline]
fn fast_string_eq(a string, b string) bool {
if a.len != b.len {
return false
}
unsafe {
return C.memcmp(a.str, b.str, b.len) == 0
}
}
fn map_hash_string(pkey voidptr) u64 {
key := *unsafe { &string(pkey) }
return C.wyhash(key.str, u64(key.len), 0, &u64(C._wyp))
}
fn map_hash_int_1(pkey voidptr) u64 {
return C.wyhash64(*unsafe { &byte(pkey) }, 0)
}
fn map_hash_int_2(pkey voidptr) u64 {
return C.wyhash64(*unsafe { &u16(pkey) }, 0)
}
fn map_hash_int_4(pkey voidptr) u64 {
return C.wyhash64(*unsafe { &u32(pkey) }, 0)
}
fn map_hash_int_8(pkey voidptr) u64 {
return C.wyhash64(*unsafe { &u64(pkey) }, 0)
}
// Move all zeros to the end of the array and resize array
fn (mut d DenseArray) zeros_to_end() {
// TODO alloca?
mut tmp_value := unsafe { malloc(d.value_bytes) }
mut tmp_key := unsafe { malloc(d.key_bytes) }
mut count := 0
for i in 0 .. d.len {
if d.has_index(i) {
// swap (TODO: optimize)
unsafe {
if count != i {
// Swap keys
C.memcpy(tmp_key, d.key(count), d.key_bytes)
C.memcpy(d.key(count), d.key(i), d.key_bytes)
C.memcpy(d.key(i), tmp_key, d.key_bytes)
// Swap values
C.memcpy(tmp_value, d.value(count), d.value_bytes)
C.memcpy(d.value(count), d.value(i), d.value_bytes)
C.memcpy(d.value(i), tmp_value, d.value_bytes)
}
}
count++
}
}
unsafe {
free(tmp_value)
free(tmp_key)
d.deletes = 0
// TODO: reallocate instead as more deletes are likely
free(d.all_deleted)
}
d.len = count
old_cap := d.cap
d.cap = if count < 8 { 8 } else { count }
unsafe {
d.values = realloc_data(d.values, d.value_bytes * old_cap, d.value_bytes * d.cap)
d.keys = realloc_data(d.keys, d.key_bytes * old_cap, d.key_bytes * d.cap)
}
}
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