Add memory utilities

mem/include/util/mem_utils.h

@@ -0,0 +1,8 @@
+#ifndef MEM_UTILS_H
+#define MEM_UTILS_H
+
+#include "aliases.h"
+
+void *mem_util_align_forward(void *ptr, u64 alignment);
+
+#endif // !MEM_UTILS_H

mem/src/util/mem_utils.c

@@ -0,0 +1,23 @@
+#include "mem_utils.h"
+#include "aliases.h"
+#include <assert.h>
+#include <stdbool.h>
+
+internal bool is_power_of_two(u64 num) { return (num & (num - 1)) == 0; }
+
+void *mem_util_align_forward(void *ptr, u64 alignment) {
+  assert(is_power_of_two(alignment));
+
+  uptr p = (uptr)ptr;
+  uptr align = (uptr)alignment;
+
+  // Similar to p % align, but it's a faster implementation that works fine
+  // because align is guaranteed to be a power of 2
+  uptr modulo = p & (align - 1);
+
+  if (modulo != 0) {
+    p += align - modulo;
+  }
+
+  return (void *)p;
+}