diff --git a/lib/std/core/allocators/arena_allocator.c3 b/lib/std/core/allocators/arena_allocator.c3
index 1e84dadb5..fac0229d9 100644
--- a/lib/std/core/allocators/arena_allocator.c3
+++ b/lib/std/core/allocators/arena_allocator.c3
@@ -25,7 +25,7 @@ private fn void*! arena_allocator_function(Allocator* data, usize size, usize al
 			if (!size) return null;
 			alignment = alignment_for_allocation(alignment);
 			void* mem = arena._alloc(size, alignment, offset)?;
-			if (clear) mem::memset(mem, 0, size, false, DEFAULT_MEM_ALIGNMENT);
+			if (clear) mem::clear(mem, size, DEFAULT_MEM_ALIGNMENT);
         	return mem;
 		case ALIGNED_REALLOC:
 		case REALLOC:
@@ -114,6 +114,6 @@ private fn void*! ArenaAllocator._realloc(ArenaAllocator* this, void *old_pointe
 	}
 	// Otherwise just allocate new memory.
 	void* mem = this._alloc(size, alignment, offset)?;
-	mem::memcpy(mem, old_pointer, old_size, false, DEFAULT_MEM_ALIGNMENT, DEFAULT_MEM_ALIGNMENT);
+	mem::copy(mem, old_pointer, old_size, DEFAULT_MEM_ALIGNMENT, DEFAULT_MEM_ALIGNMENT);
 	return mem;
 }
\ No newline at end of file
diff --git a/lib/std/core/allocators/dynamic_arena.c3 b/lib/std/core/allocators/dynamic_arena.c3
index 8a04f4e10..4172e9c0f 100644
--- a/lib/std/core/allocators/dynamic_arena.c3
+++ b/lib/std/core/allocators/dynamic_arena.c3
@@ -58,7 +58,7 @@ private fn void*! DynamicArenaAllocator._realloc(DynamicArenaAllocator* this, vo
 		return old_pointer;
 	}
 	void* new_mem = this._alloc(size, alignment, offset)?;
-	mem::memcpy(new_mem, old_pointer, old_size, false, DEFAULT_MEM_ALIGNMENT);
+	mem::copy(new_mem, old_pointer, old_size, DEFAULT_MEM_ALIGNMENT);
 	return new_mem;
 }
 
@@ -164,7 +164,7 @@ private fn void*! dynamic_arena_allocator_function(Allocator* data, usize size,
 			assert(!old_pointer, "Unexpected no old pointer for calloc.");
 			if (!size) return null;
 			void* mem = allocator._alloc(size, alignment, offset)?;
-			mem::memset(mem, 0, size, false, DEFAULT_MEM_ALIGNMENT);
+			mem::clear(mem, size, DEFAULT_MEM_ALIGNMENT);
 			return mem;
 		case ALLOC:
 		case ALIGNED_ALLOC:
diff --git a/lib/std/core/allocators/mem_allocator_fn.c3 b/lib/std/core/allocators/mem_allocator_fn.c3
index b0edc477f..2fb46d31d 100644
--- a/lib/std/core/allocators/mem_allocator_fn.c3
+++ b/lib/std/core/allocators/mem_allocator_fn.c3
@@ -66,7 +66,7 @@ private fn void* _libc_aligned_realloc(void* old_pointer, usize bytes, usize ali
 	AlignedBlock* desc = (AlignedBlock*)old_pointer - 1;
     void* data_start = desc.start;
     void* new_data = _libc_aligned_calloc(bytes, alignment, offset);
-	mem::memcpy(new_data, old_pointer, desc.len > bytes ? desc.len : bytes, false, DEFAULT_MEM_ALIGNMENT, DEFAULT_MEM_ALIGNMENT);
+	mem::copy(new_data, old_pointer, desc.len > bytes ? desc.len : bytes, DEFAULT_MEM_ALIGNMENT, DEFAULT_MEM_ALIGNMENT);
 	libc::free(data_start);
 	return new_data;
 }
diff --git a/lib/std/core/allocators/temp_allocator.c3 b/lib/std/core/allocators/temp_allocator.c3
index c57c6648e..e60253fcf 100644
--- a/lib/std/core/allocators/temp_allocator.c3
+++ b/lib/std/core/allocators/temp_allocator.c3
@@ -134,7 +134,7 @@ private fn void*! TempAllocator._realloc_page(TempAllocator* this, TempAllocator
 	usize page_size = page.pagesize();
 	// Clear on size > original size.
 	void* data = this._alloc(size, alignment, offset, false)?;
-	mem::memcpy(data, &page.data[0], page_size, false, DEFAULT_MEM_ALIGNMENT, DEFAULT_MEM_ALIGNMENT);
+	mem::copy(data, &page.data[0], page_size, DEFAULT_MEM_ALIGNMENT, DEFAULT_MEM_ALIGNMENT);
 	if (page.is_aligned())
 	{
 		this.backing_allocator.free_aligned(real_pointer)?;
@@ -161,7 +161,7 @@ private fn void*! TempAllocator._realloc(TempAllocator* this, void* pointer, usi
 
 	// TODO optimize last allocation
 	TempAllocatorChunk* data = this._alloc(size, alignment, offset, size > chunk.size)?;
-	mem::memcpy(data, pointer, chunk.size, false, DEFAULT_MEM_ALIGNMENT, DEFAULT_MEM_ALIGNMENT);
+	mem::copy(data, pointer, chunk.size, DEFAULT_MEM_ALIGNMENT, DEFAULT_MEM_ALIGNMENT);
 
 	return data;
 }
@@ -190,7 +190,7 @@ private fn void*! TempAllocator._alloc(TempAllocator* this, usize size, usize al
 		TempAllocatorChunk* chunk_start = mem - TempAllocatorChunk.sizeof;
     	chunk_start.size = size;
     	this.used = new_usage;
-    	if (clear) mem::memset(mem, 0, size, false, DEFAULT_MEM_ALIGNMENT);
+    	if (clear) mem::clear(mem, size, DEFAULT_MEM_ALIGNMENT);
     	return mem;
 	}
 
diff --git a/lib/std/core/builtin.c3 b/lib/std/core/builtin.c3
index ee2a879eb..72e715ef6 100644
--- a/lib/std/core/builtin.c3
+++ b/lib/std/core/builtin.c3
@@ -97,7 +97,7 @@ macro bitcast(expr, $Type) @builtin
     var $size = (usize)($sizeof(expr));
     $assert($size == $Type.sizeof, "Cannot bitcast between types of different size.");
     $Type x = void;
-    mem::memcpy(&x, &expr, $size, false, $alignof($Type), $alignof(expr));
+    mem::copy(&x, &expr, $size, $alignof($Type), $alignof(expr));
     return x;
 }
 
diff --git a/lib/std/core/mem.c3 b/lib/std/core/mem.c3
index 0b50323c7..3b683ce82 100644
--- a/lib/std/core/mem.c3
+++ b/lib/std/core/mem.c3
@@ -35,24 +35,19 @@ fn bool ptr_is_aligned(void* ptr, usize alignment) @inline
 	return (uptr)ptr & ((uptr)alignment - 1) == 0;
 }
 
-fn void copy(char* dst, char* src, usize size) @inline
+macro void copy(void* dst, void* src, usize len, usize $dst_align = 0, usize $src_align = 0, bool $is_volatile = false)
 {
-	memcpy(dst, src, size);
+	$$memcpy(dst, src, len, $is_volatile, $dst_align, $src_align);
 }
 
-macro void memcpy(void* dst, void* src, usize size, bool $is_volatile = false, usize $dst_align = 0, usize $src_align = 0)
+macro void set(void* dst, char val, usize len, usize $dst_align = 0, bool $is_volatile = false)
 {
-	$$memcpy(dst, src, size, $is_volatile, $dst_align, $src_align);
+	$$memset(dst, val, len, $is_volatile, $dst_align);
 }
 
-fn void set(void* dst, char val, usize bytes) @inline
+macro void clear(void* dst, usize len, usize $dst_align = 0, bool $is_volatile = false)
 {
-	memset(dst, val, bytes);
-}
-
-macro void memset(void* dst, char val, usize bytes, bool $is_volatile = false, usize $dst_align = 0)
-{
-	$$memset(dst, val, bytes, $is_volatile, $dst_align);
+	$$memset(dst, (char)0, len, $is_volatile, $dst_align);
 }
 
 macro @clone(&value) @builtin
@@ -62,22 +57,19 @@ macro @clone(&value) @builtin
 	return x;
 }
 
-macro malloc($Type) @builtin
+macro @tclone(&value) @builtin
 {
-    return ($Type*)(mem::alloc($Type.sizeof));
+	$typeof(value)* x = talloc($typeof(value));
+	*x = value;
+	return x;
 }
 
-fn char[] alloc_bytes(usize bytes) @inline
-{
-	return ((char*)thread_allocator.alloc(bytes))[:bytes]!!;
-}
-
-fn void* alloc(usize size)
+fn void* malloc(usize size) @builtin @inline
 {
 	return thread_allocator.alloc(size)!!;
 }
 
-fn void*! alloc_checked(usize size)
+fn void*! malloc_checked(usize size) @builtin @inline
 {
 	return thread_allocator.alloc(size);
 }
@@ -85,17 +77,28 @@ fn void*! alloc_checked(usize size)
 /**
  * @require alignment && math::is_power_of_2(alignment)
  */
-fn void*! alloc_aligned(usize size, usize alignment)
+fn void*! malloc_aligned(usize size, usize alignment) @builtin @inline
 {
 	return thread_allocator.alloc_aligned(size, alignment);
 }
 
-fn void* calloc(usize size)
+fn char[] alloc_bytes(usize bytes) @inline
+{
+	return ((char*)thread_allocator.alloc(bytes))[:bytes]!!;
+}
+
+macro alloc($Type)
+{
+	return ($Type*)thread_allocator.alloc($Type.sizeof)!!;
+}
+
+
+fn void* calloc(usize size) @builtin @inline
 {
 	return thread_allocator.calloc(size)!!;
 }
 
-fn void*! calloc_checked(usize size)
+fn void*! calloc_checked(usize size) @builtin @inline
 {
 	return thread_allocator.calloc(size);
 }
@@ -103,18 +106,17 @@ fn void*! calloc_checked(usize size)
 /**
  * @require alignment && math::is_power_of_2(alignment)
  */
-fn void*! calloc_aligned(usize size, usize alignment)
+fn void*! calloc_aligned(usize size, usize alignment) @builtin @inline
 {
 	return thread_allocator.calloc_aligned(size, alignment);
 }
 
-
-fn void* realloc(void *ptr, usize new_size)
+fn void* realloc(void *ptr, usize new_size) @builtin @inline
 {
 	return thread_allocator.realloc(ptr, new_size)!!;
 }
 
-fn void*! realloc_checked(void *ptr, usize new_size)
+fn void*! realloc_checked(void *ptr, usize new_size) @builtin @inline
 {
 	return thread_allocator.realloc(ptr, new_size);
 }
@@ -122,17 +124,17 @@ fn void*! realloc_checked(void *ptr, usize new_size)
 /**
  * @require alignment && math::is_power_of_2(alignment)
  */
-fn void*! realloc_aligned(void *ptr, usize new_size, usize alignment)
+fn void*! realloc_aligned(void *ptr, usize new_size, usize alignment) @builtin @inline
 {
 	return thread_allocator.realloc_aligned(ptr, new_size, alignment);
 }
 
-fn void free(void* ptr) @builtin
+fn void free(void* ptr) @builtin @inline
 {
 	return thread_allocator.free(ptr)!!;
 }
 
-fn void free_aligned(void* ptr)
+fn void free_aligned(void* ptr) @builtin @inline
 {
 	return thread_allocator.free_aligned(ptr)!!;
 }
@@ -159,17 +161,22 @@ macro void @tscoped(;@body())
 	@body();
 }
 
-fn void* talloc(usize size, usize alignment = 0)
+macro talloc($Type) @builtin
+{
+	return temp_allocator().alloc_aligned($Type.sizeof, $alignof($Type))!!;
+}
+
+fn void* tmalloc(usize size, usize alignment = 0) @builtin @inline
 {
     return temp_allocator().alloc_aligned(size, alignment)!!;
 }
 
-fn void* tcalloc(usize size, usize alignment = 0)
+fn void* tcalloc(usize size, usize alignment = 0) @builtin @inline
 {
 	return temp_allocator().calloc_aligned(size, alignment)!!;
 }
 
-fn void* trealloc(void* ptr, usize size, usize alignment = 0)
+fn void* trealloc(void* ptr, usize size, usize alignment = 0) @builtin @inline
 {
 	return temp_allocator().realloc_aligned(ptr, size, alignment)!!;
 }
diff --git a/lib/std/core/mem_array.c3 b/lib/std/core/mem_array.c3
index a9e7bcabe..76658b593 100644
--- a/lib/std/core/mem_array.c3
+++ b/lib/std/core/mem_array.c3
@@ -8,7 +8,7 @@ module std::core::mem::array;
  **/
 macro alloc($Type, usize elements)
 {
-    $Type* ptr = mem::alloc($Type.sizeof * elements, $alignof($Type));
+    $Type* ptr = malloc($Type.sizeof * elements);
     return ptr[:elements];
 }
 
@@ -17,7 +17,7 @@ macro alloc($Type, usize elements)
  **/
 macro talloc($Type, usize elements)
 {
-    $Type* ptr = mem::talloc($Type.sizeof * elements, $alignof($Type[1]));
+    $Type* ptr = tmalloc($Type.sizeof * elements, $alignof($Type[1]));
     return ptr[:elements];
 }
 
@@ -26,7 +26,7 @@ macro talloc($Type, usize elements)
  **/
 macro make($Type, usize elements)
 {
-    $Type* ptr = mem::calloc($sizeof($Type) * elements, $alignof($Type[1]));
+    $Type* ptr = calloc($sizeof($Type) * elements);
     return ptr[:elements];
 }
 
@@ -35,6 +35,6 @@ macro make($Type, usize elements)
  **/
 macro tmake($Type, usize elements)
 {
-    $Type* ptr = mem::tcalloc($sizeof($Type) * elements, $alignof($Type[1]));
+    $Type* ptr = tcalloc($sizeof($Type) * elements, $alignof($Type[1]));
     return ptr[:elements];
 }
diff --git a/lib/std/core/str.c3 b/lib/std/core/str.c3
index 5d99e336f..257717110 100644
--- a/lib/std/core/str.c3
+++ b/lib/std/core/str.c3
@@ -32,7 +32,7 @@ fn String join(char[][] s, char[] joiner)
 fn ZString copy_zstring(char[] s)
 {
     usize len = s.len;
-    char* str = mem::alloc(len + 1);
+    char* str = malloc(len + 1);
     mem::copy(str, s.ptr, len);
     str[len] = 0;
     return (ZString)str;
@@ -41,7 +41,7 @@ fn ZString copy_zstring(char[] s)
 fn ZString tcopy_zstring(char[] s)
 {
     usize len = s.len;
-    char* str = mem::talloc(len + 1);
+    char* str = tmalloc(len + 1);
     mem::copy(str, s.ptr, len);
     str[len] = 0;
     return (ZString)str;
@@ -128,7 +128,7 @@ fn char[] tcopy(char[] s)
 fn char[] tconcat(char[] s1, char[] s2)
 {
     usize full_len = s1.len + s2.len;
-    char* str = mem::talloc(full_len + 1);
+    char* str = tmalloc(full_len + 1);
     usize s1_len = s1.len;
     mem::copy(str, s1.ptr, s1_len);
     mem::copy(str + s1_len, s2.ptr, s2.len);
@@ -139,7 +139,7 @@ fn char[] tconcat(char[] s1, char[] s2)
 fn char[] concat(char[] s1, char[] s2)
 {
     usize full_len = s1.len + s2.len;
-    char* str = mem::alloc(full_len + 1);
+    char* str = malloc(full_len + 1);
     usize s1_len = s1.len;
     mem::copy(str, s1.ptr, s1_len);
     mem::copy(str + s1_len, s2.ptr, s2.len);
diff --git a/lib/std/io.c3 b/lib/std/io.c3
index 3c67b1a5c..4d199c9af 100644
--- a/lib/std/io.c3
+++ b/lib/std/io.c3
@@ -41,8 +41,8 @@ fn int println(char *message = "") @inline
 
 fn void! File.open(File* file, char[] filename, char[] mode)
 {
-    char* filename_copy = mem::talloc(filename.len + 1);
-    char* mode_copy = mem::talloc(mode.len + 1);
+    char* filename_copy = tmalloc(filename.len + 1);
+    char* mode_copy = tmalloc(mode.len + 1);
 
     mem::copy(filename_copy, (char*)(filename), filename.len);
     mem::copy(mode_copy, (char*)(mode), mode.len);
diff --git a/lib/std/linkedlist.c3 b/lib/std/linkedlist.c3
index 8c0efecf5..9513f8454 100644
--- a/lib/std/linkedlist.c3
+++ b/lib/std/linkedlist.c3
@@ -25,7 +25,7 @@ fn void LinkedList.push(LinkedList *list, Type value)
 private fn void LinkedList.linkFirst(LinkedList *list, Type value)
 {
     Node *first = list.first;
-    Node *new_node = mem::malloc(Node);
+    Node *new_node = mem::alloc(Node);
     *new_node = { .next = first, .value = value };
     list.first = new_node;
     if (!first)
@@ -42,7 +42,7 @@ private fn void LinkedList.linkFirst(LinkedList *list, Type value)
 private fn void LinkedList.linkLast(LinkedList *list, Type value)
 {
     Node *last = list.last;
-    Node *new_node = mem::alloc(Node.sizeof);
+    Node *new_node = mem::alloc(Node);
     *new_node = { .prev = last, .value = value };
     list.last = new_node;
     if (!last)
@@ -61,7 +61,7 @@ fn void LinkedList.free(LinkedList *list)
     for (Node* node = list.first; node != null;)
     {
         Node* next = node.next;
-        mem::free(node);
+        free(node);
         node = next;
     }
     list.first = null;
@@ -89,7 +89,7 @@ fn Type LinkedList.get(LinkedList* list, usize index)
 private fn void LinkedList.linkBefore(LinkedList *list, Node *succ, Type value)
 {
     Node* pred = succ.prev;
-    Node* new_node = mem::malloc(Node);
+    Node* new_node = mem::alloc(Node);
     *new_node = { .prev = pred, .next = succ, .value = value };
     succ.prev = new_node;
     if (!pred)
@@ -109,7 +109,7 @@ private fn void LinkedList.linkBefore(LinkedList *list, Node *succ, Type value)
 private fn void unlinkFirst(LinkedList* list, Node* f)
 {
     Node* next = f.next;
-    mem::free(f);
+    free(f);
     list.first = next;
     if (!next)
     {
@@ -129,7 +129,7 @@ private fn void LinkedList.unlinkLast(LinkedList *list, Node* l)
 {
     Node* prev = l.prev;
     list.last = prev;
-    mem::free(l);
+    free(l);
     if (!prev)
     {
         list.first = null;
@@ -164,6 +164,6 @@ private fn void LinkedList.unlink(LinkedList* list, Node* x)
     {
         next.prev = prev;
     }
-    mem::free(x);
+    free(x);
     list.size--;
 }
diff --git a/lib/std/list.c3 b/lib/std/list.c3
index e54889c9b..7b789ff47 100644
--- a/lib/std/list.c3
+++ b/lib/std/list.c3
@@ -15,7 +15,7 @@ private fn void List.ensure_capacity(List *list) @inline
     if (list.capacity == list.size)
     {
         list.capacity = list.capacity ? 2 * list.capacity : 16;
-        list.entries = mem::realloc(list.entries, Type.sizeof * list.capacity);
+        list.entries = realloc(list.entries, Type.sizeof * list.capacity);
     }
 }
 
@@ -111,7 +111,7 @@ fn Type List.get(List *list, usize index)
 
 fn void List.free(List *list)
 {
-    mem::free(list.entries);
+    free(list.entries);
     list.capacity = 0;
     list.size = 0;
     list.entries = null;
diff --git a/resources/examples/contextfree/boolerr.c3 b/resources/examples/contextfree/boolerr.c3
index 7c8f3731f..690c38068 100644
--- a/resources/examples/contextfree/boolerr.c3
+++ b/resources/examples/contextfree/boolerr.c3
@@ -44,7 +44,7 @@ fn bool contains(char[] haystack, char[] needle)
 
 macro @dupe(value)
 {
-	$typeof(&value) temp = mem::alloc_checked($sizeof(value))?;
+	$typeof(&value) temp = malloc_checked($sizeof(value))?;
 	*temp = value;
 	return temp;
 }
diff --git a/resources/examples/contextfree/guess_number.c3 b/resources/examples/contextfree/guess_number.c3
index 926e71148..d86863d88 100644
--- a/resources/examples/contextfree/guess_number.c3
+++ b/resources/examples/contextfree/guess_number.c3
@@ -32,7 +32,7 @@ fn int! askGuess(int high)
 
 fn char[]! readLine()
 {
-	char* chars = mem::talloc(1024)?;
+	char* chars = tmalloc(1024)?;
 	isize loaded = getline(&chars, &&(usize)1023, libc::stdin());
 	if (loaded < 0) return InputResult.FAILED_TO_READ!;
 	chars[loaded] = 0;
diff --git a/resources/examples/gameoflife.c3 b/resources/examples/gameoflife.c3
index e1d52f400..eb47f7a5d 100644
--- a/resources/examples/gameoflife.c3
+++ b/resources/examples/gameoflife.c3
@@ -69,8 +69,8 @@ fn int main(int c, char** v)
 	GameBoard board;
 	board.w = w;
 	board.h = h;
-	board.world = mem::alloc((ulong)(h * w));
-	board.temp = mem::alloc((ulong)(h * w));
+	board.world = malloc((ulong)(h * w));
+	board.temp = malloc((ulong)(h * w));
 
 	for (int i = h * w - 1; i >= 0; i--)
 	{
diff --git a/resources/examples/notworking/toml_parser_c2.c3 b/resources/examples/notworking/toml_parser_c2.c3
index d35fbc0ed..0ebb9751e 100644
--- a/resources/examples/notworking/toml_parser_c2.c3
+++ b/resources/examples/notworking/toml_parser_c2.c3
@@ -118,8 +118,8 @@ fn void! Parser.parse(Parser* p, char* input, char* diagMsg, Blocks* blocks)
     p.errorMsg[0] = 0;
 
     p.blocks = blocks;
-    memset(p.parents, 0, sizeof(Node*)*MaxDepth);
-    memset(p.lastChild, 0, sizeof(Node*)*MaxDepth);
+    mem::set(p.parents, 0, sizeof(Node*)*MaxDepth);
+    mem::set(p.lastChild, 0, sizeof(Node*)*MaxDepth);
     p.numParents = 0;
     p.topParent = nil;
 
@@ -438,13 +438,13 @@ fn const Node* Reader.findNode(const Reader* r, const char* key)
         switch (*cp) {
         case 0:
             len = cast<u32>(cp - start);
-            memcpy(name, start, len);
+            mem::copy(name, start, len);
             name[len] = 0;
             node = r.blocks.findNode(name, node);
             return node;
         case '.':
             len = cast<u32>(cp - start);
-            memcpy(name, start, len);
+            mem::copy(name, start, len);
             name[len] = 0;
             start = cp + 1;
             node = r.blocks.findNode(name, node);
@@ -644,7 +644,7 @@ public type Blocks struct {
 } @(opaque)
 
 fn void Blocks.init(Blocks* b) {
-    memset(b, 0, sizeof(Blocks));
+    mem::set(b, 0, sizeof(Blocks));
     b.nodes = calloc(MaxNodes, sizeof(Node));
 
     b.namesSize = MaxNames;
@@ -659,7 +659,7 @@ fn void Blocks.init(Blocks* b) {
 
     b.lastCache = 0;
     //memset(b.namesCache, 0, sizeof(b.namesCache));    // sizeof(struct member) not supported yet
-    memset(b.namesCache, 0, sizeof(u32)*NamesCacheSize);
+    mem::set(b.namesCache, 0, sizeof(u32)*NamesCacheSize);
 }
 
 fn void Blocks.destroy(Blocks* b) {
@@ -702,7 +702,7 @@ fn u32 Blocks.addNode(Blocks* b, const char* name, NodeKind k) {
             nameOffset = b.namesOffset;
             node.nameOffset = nameOffset;
             char* newname = &b.names[nameOffset];
-            memcpy(newname, name, len);
+            mem::copy(newname, name, len);
             b.namesCache[b.lastCache] = nameOffset;
             b.lastCache = (b.lastCache + 1) % NamesCacheSize;
             b.namesOffset += len;
@@ -716,7 +716,7 @@ fn u32 Blocks.addValue(Blocks* b, const char* value) {
     if (value[0] == 0) return 0;
     u32 off = b.valuesOffset;
     u32 len = cast<u32>(strlen(value)) + 1;
-    memcpy(&b.values[off], value, len);
+    mem::copy(&b.values[off], value, len);
     b.valuesOffset += len;
     return off;
 }
diff --git a/resources/examples/notworking/toml_tokenizer_c2.c3 b/resources/examples/notworking/toml_tokenizer_c2.c3
index fcec7e945..9c28afa8c 100644
--- a/resources/examples/notworking/toml_tokenizer_c2.c3
+++ b/resources/examples/notworking/toml_tokenizer_c2.c3
@@ -269,7 +269,7 @@ fn void Tokenizer.parseText(Tokenizer* t, Token* result)
 
     uint len = (uint)(t.current - start);
     // assert(len < MaxText);
-    memcpy(t.text as start, len);
+    mem::copy(t.text as start, len);
     t.text[len] = 0;
     result.kind = TokenKind.Text;
     result.text = t.text;
@@ -310,7 +310,7 @@ fn void! Tokenizer.parseMultiText(Tokenizer* t, Token* result)
 
     uint len = uint(t.current - start);
     // assert(len < MaxText);
-    memcpy(t.text, start, len);
+    mem::copy(t.text, start, len);
     t.text[len] = 0;
     result.kind = TokenKind.Text;
     result.text = t.text;
@@ -349,7 +349,7 @@ fn void Tokenizer.parseKey(Tokenizer* t, Token* result)
 
     uint len = (uint)(t.current - start);
     // assert(len < MaxText);
-    memcpy(t.text, start, len);
+    mem::copy(t.text, start, len);
     t.text[len] = 0;
     result.kind = TokenKind.Word;
     result.text = t.text;
diff --git a/resources/testfragments/allocators_testing.c3 b/resources/testfragments/allocators_testing.c3
index b77bcd05f..f22a72dd9 100644
--- a/resources/testfragments/allocators_testing.c3
+++ b/resources/testfragments/allocators_testing.c3
@@ -37,41 +37,41 @@ fn void testAllocator(Allocator* a, int val)
 }
 fn void main()
 {
-	char* small = mem::talloc(128);
+	char* small = tmalloc(128);
 	setstring(small, "small");
 	libc::printf("Small1: %p %s\n", small, small);
 	print_pages();
-	small = mem::trealloc(small, 129, 1024 * 16);
+	small = trealloc(small, 129, 1024 * 16);
 	libc::printf("Small2: %p %s\n", small, small);
 	print_pages();
-	small = mem::trealloc(small, 12933);
+	small = trealloc(small, 12933);
 	libc::printf("Small3: %p %s\n", small, small);
 	print_pages();
-	char* first_big = mem::talloc(9512);
-	void *big = mem::talloc(4095);
+	char* first_big = tmalloc(9512);
+	void *big = tmalloc(4095);
 	io::printf("Big: %p\n", big);
-	io::printf("Small: %p\n", mem::talloc(13));
+	io::printf("Small: %p\n", tmalloc(13));
 	print_pages();
 	@pool() {
-	big = mem::trealloc(big, 5067);
+	big = trealloc(big, 5067);
 	print_pages();
-	void* hidden = mem::talloc(4096);
+	void* hidden = tmalloc(4096);
 	io::printf("Hidden: %p\n", hidden);
 	io::printf("Big: %p\n", big);
-	big = mem::trealloc(big, 4096, 256);
+	big = trealloc(big, 4096, 256);
 	io::printf("Big: %p\n", big);
 	io::printf("First big: %p\n", first_big);
 	print_pages();
 	};
 	mem::@tscoped()
 	{
-		io::printf("Malloc: %p\n", mem::alloc(23));
-		io::printf("Malloc: %p\n", mem::alloc(23));
+		io::printf("Malloc: %p\n", malloc(23));
+		io::printf("Malloc: %p\n", malloc(23));
 	};
-	io::printf("Malloc: %p\n", mem::alloc(23));
+	io::printf("Malloc: %p\n", malloc(23));
 	@pool()
 	{
-		io::printf("Talloc: %p\n", mem::talloc(22));
+		io::printf("Talloc: %p\n", tmalloc(22));
 	};
 	testAllocator(mem::temp_allocator(), 126);
 	testAllocator(mem::temp_allocator(), 12600);
diff --git a/resources/testfragments/casting.c3 b/resources/testfragments/casting.c3
index 3e04eeb7a..28347f7c6 100644
--- a/resources/testfragments/casting.c3
+++ b/resources/testfragments/casting.c3
@@ -33,7 +33,7 @@ fn void getComm(uint len, char* src)
     uint size;
     size = len - 2;
     char* comm = malloc(size + 1);
-    memcpy(comm, src, size);
+    mem::copy(comm, src, size);
 }
 
 fn uint* decode_fh(uint* p, SvcFh* fhp)
@@ -42,7 +42,7 @@ fn uint* decode_fh(uint* p, SvcFh* fhp)
     fh_init(fhp, NFS3_FHSIZE);
     size = ntohl(*p++);
     if (size > NFS3_FHSIZE) return NULL;
-    memcpy(&fhp.fh_handle.fh_base, p, size);
+    mem::copy(&fhp.fh_handle.fh_base, p, size);
     fhp.fh_handle.fh_size = size;
     return p + XDR_QUADLEN(size);
 }
diff --git a/resources/testfragments/tmem.c3 b/resources/testfragments/tmem.c3
index 54388d0a5..ff683f3dd 100644
--- a/resources/testfragments/tmem.c3
+++ b/resources/testfragments/tmem.c3
@@ -13,14 +13,14 @@ struct String
 fn void String.init(String *s, char[] c)
 {
     s.capacity = c.len + 16;
-    s.ptr = mem::_malloc(s.capacity);
+    s.ptr = malloc(s.capacity);
     s.len = c.len;
     mem::copy(s.ptr, (char*)(c), c.len);
 }
 
 fn char* String.zstr(String *s)
 {
-    char* c = mem::_malloc(s.len + 1);
+    char* c = malloc(s.len + 1);
     mem::copy(c, s.ptr, s.len);
     c[s.len] = 0;
     return c;
@@ -31,7 +31,7 @@ fn void String.appendc(String *s, char c)
     if (s.capacity == s.len)
     {
         s.capacity *= 2;
-        char* new_ptr = mem::_malloc(s.capacity);
+        char* new_ptr = malloc(s.capacity);
         mem::copy(new_ptr, s.ptr, s.len);
         s.ptr = new_ptr;
     }
@@ -47,7 +47,7 @@ fn void String.append(String *s, char[] other_string)
             s.capacity *= 2;
         }
         while (s.capacity < s.len + other_string.len);
-        char* new_ptr = mem::_malloc(s.capacity);
+        char* new_ptr = malloc(s.capacity);
         mem::copy(new_ptr, s.ptr, s.len);
         s.ptr = new_ptr;
     }
@@ -64,7 +64,7 @@ fn void String.concat(String *s, String* other_string)
             s.capacity *= 2;
         }
         while (s.capacity < s.len + other_string.len);
-        char* new_ptr = mem::_malloc(s.capacity);
+        char* new_ptr = malloc(s.capacity);
         mem::copy(new_ptr, s.ptr, s.len);
         s.ptr = new_ptr;
     }
diff --git a/src/compiler/sema_name_resolution.c b/src/compiler/sema_name_resolution.c
index 884d9dabb..25faf43fc 100644
--- a/src/compiler/sema_name_resolution.c
+++ b/src/compiler/sema_name_resolution.c
@@ -78,6 +78,19 @@ static Decl *sema_find_decl_in_imports(Decl **imports, NameResolve *name_resolve
 		// Did we already have a match?
 		if (decl)
 		{
+			if (!path)
+			{
+				// Prefer already found builtin over new found no builtin
+				if (decl->is_autoimport && !found->is_autoimport) continue;
+				// Prefer new builtin over non-builtin
+				if (found->is_autoimport && !decl->is_autoimport)
+				{
+					decl = found;
+					name_resolve->private_decl = NULL;
+					name_resolve->ambiguous_other_decl = NULL;
+					continue;
+				}
+			}
 			// 11. Then set an ambiguous match.
 			name_resolve->ambiguous_other_decl = found;
 			continue;
@@ -237,6 +250,19 @@ static Decl *sema_find_decl_in_global_new(CompilationUnit *unit, DeclTable *tabl
 		{
 			ambiguous = decl;
 			decl = candidate;
+			if (ambiguous)
+			{
+				// If we have a same match but one is builtin, prefer builtin.
+				if (!ambiguous->is_autoimport && decl->is_autoimport)
+				{
+					ambiguous = NULL;
+				}
+				else if (ambiguous->is_autoimport && !decl->is_autoimport)
+				{
+					decl = ambiguous;
+					ambiguous = NULL;
+				}
+			}
 		}
 	}
 	name_resolve->ambiguous_other_decl = ambiguous;
@@ -320,13 +346,25 @@ static Decl *sema_resolve_no_path_symbol(SemaContext *context, NameResolve *name
 
 	if (decl) return decl;
 
-
 	// Search in the module.
 	decl = module_find_symbol(unit->module, symbol);
 
 	if (decl) return decl;
 
 	decl = sema_find_decl_in_imports(unit->imports, name_resolve, false);
+
+	// Special case: the declaration in import is not autoimport and is not a type (which won't be @builtin)
+	// e.g we have a malloc builtin and libc::malloc
+	if (decl && !decl->is_autoimport && !decl_is_user_defined_type(decl))
+	{
+		// Find the global
+		NameResolve copy = *name_resolve;
+		Decl *global = sema_find_decl_in_global_new(context->unit, &global_context.symbols, NULL, name_resolve, false);
+		// If it exists and is autoimport, then prefer it.
+		if (global && global->is_autoimport) return global;
+		*name_resolve = copy;
+		return decl;
+	}
 	return decl ? decl : sema_find_decl_in_global_new(context->unit, &global_context.symbols, NULL, name_resolve, false);
 }
 
diff --git a/test/test_suite/errors/error_regression_2.c3t b/test/test_suite/errors/error_regression_2.c3t
index c10b1cc7c..38534b7e0 100644
--- a/test/test_suite/errors/error_regression_2.c3t
+++ b/test/test_suite/errors/error_regression_2.c3t
@@ -39,7 +39,7 @@ fn bool contains(char[] haystack, char[] needle)
 
 macro dupe(value)
 {
-	$typeof(&value) temp = mem::alloc($sizeof(value));
+	$typeof(&value) temp = malloc($sizeof(value));
 	if (!temp) return ReadError.OUT_OF_MEMORY!;
 	*temp = value;
 	return temp;
@@ -59,7 +59,7 @@ fn Doc! readDoc(char[] url)
 	if (contains(url, "title-empty")) return { dupe(Head { .title = dupe((char[])"")? })? };
 	// Not particularly elegant due to missing string functions.
 	int len = libc::snprintf(null, 0, "Title of %.*s", (int)url.len, url.ptr);
-	char* str = mem::alloc(len + 1);
+	char* str = malloc(len + 1);
 	if (!str) return ReadError.OUT_OF_MEMORY!;
 	libc::snprintf(str, len + 1, "Title of %.*s", (int)url.len, url.ptr);
 	return { dupe(Head { .title = dupe(str[..len - 1])? })? };
@@ -368,7 +368,7 @@ if.then15:                                        ; preds = %if.exit9
   store %"char[]"* null, %"char[]"** %33, align 8
   %34 = load %Head, %Head* %literal18, align 8
   store %Head %34, %Head* %value, align 8
-  %35 = call i8* @std_core_mem_alloc(i64 8)
+  %35 = call i8* @std_core_mem_malloc(i64 8) #2
   %ptrptr = bitcast i8* %35 to %Head*
   store %Head* %ptrptr, %Head** %temp, align 8
   %36 = load %Head*, %Head** %temp, align 8
@@ -420,7 +420,7 @@ if.then27:                                        ; preds = %if.exit21
   store %"char[]"* null, %"char[]"** %53, align 8
   %54 = getelementptr inbounds %Head, %Head* %literal32, i32 0, i32 0
   store %"char[]" zeroinitializer, %"char[]"* %value34, align 8
-  %55 = call i8* @std_core_mem_alloc(i64 16)
+  %55 = call i8* @std_core_mem_malloc(i64 16) #2
   %ptrptr36 = bitcast i8* %55 to %"char[]"*
   store %"char[]"* %ptrptr36, %"char[]"** %temp35, align 8
   %56 = load %"char[]"*, %"char[]"** %temp35, align 8
@@ -447,7 +447,7 @@ noerr_block41:                                    ; preds = %if.exit39
   store %"char[]"* %61, %"char[]"** %54, align 8
   %62 = load %Head, %Head* %literal32, align 8
   store %Head %62, %Head* %value31, align 8
-  %63 = call i8* @std_core_mem_alloc(i64 8)
+  %63 = call i8* @std_core_mem_malloc(i64 8) #2
   %ptrptr43 = bitcast i8* %63 to %Head*
   store %Head* %ptrptr43, %Head** %temp42, align 8
   %64 = load %Head*, %Head** %temp42, align 8
@@ -488,7 +488,7 @@ if.exit49:                                        ; preds = %if.exit21
   %77 = load i32, i32* %len, align 4
   %siuiext = sext i32 %77 to i64
   %add = add i64 %siuiext, 1
-  %78 = call i8* @std_core_mem_alloc(i64 %add)
+  %78 = call i8* @std_core_mem_malloc(i64 %add) #2
   store i8* %78, i8** %str, align 8
   %79 = load i8*, i8** %str, align 8
   %not50 = icmp eq i8* %79, null
@@ -522,7 +522,7 @@ if.exit52:                                        ; preds = %if.exit49
   %93 = insertvalue %"char[]" undef, i8* %ptroffset, 0
   %94 = insertvalue %"char[]" %93, i64 %size, 1
   store %"char[]" %94, %"char[]"* %value62, align 8
-  %95 = call i8* @std_core_mem_alloc(i64 16)
+  %95 = call i8* @std_core_mem_malloc(i64 16) #2
   %ptrptr64 = bitcast i8* %95 to %"char[]"*
   store %"char[]"* %ptrptr64, %"char[]"** %temp63, align 8
   %96 = load %"char[]"*, %"char[]"** %temp63, align 8
@@ -549,7 +549,7 @@ noerr_block69:                                    ; preds = %if.exit67
   store %"char[]"* %101, %"char[]"** %89, align 8
   %102 = load %Head, %Head* %literal60, align 8
   store %Head %102, %Head* %value59, align 8
-  %103 = call i8* @std_core_mem_alloc(i64 8)
+  %103 = call i8* @std_core_mem_malloc(i64 8) #2
   %ptrptr71 = bitcast i8* %103 to %Head*
   store %Head* %ptrptr71, %Head** %temp70, align 8
   %104 = load %Head*, %Head** %temp70, align 8
diff --git a/test/test_suite2/errors/error_regression_2.c3t b/test/test_suite2/errors/error_regression_2.c3t
index 00e3d8c0f..61b497dcc 100644
--- a/test/test_suite2/errors/error_regression_2.c3t
+++ b/test/test_suite2/errors/error_regression_2.c3t
@@ -39,7 +39,7 @@ fn bool contains(char[] haystack, char[] needle)
 
 macro dupe(value)
 {
-	$typeof(&value) temp = mem::alloc($sizeof(value));
+	$typeof(&value) temp = malloc($sizeof(value));
 	if (!temp) return ReadError.OUT_OF_MEMORY!;
 	*temp = value;
 	return temp;
@@ -59,7 +59,7 @@ fn Doc! readDoc(char[] url)
 	if (contains(url, "title-empty")) return { dupe(Head { .title = dupe((char[])"")? })? };
 	// Not particularly elegant due to missing string functions.
 	int len = libc::snprintf(null, 0, "Title of %.*s", (int)url.len, url.ptr);
-	char* str = mem::alloc(len + 1);
+	char* str = malloc(len + 1);
 	if (!str) return ReadError.OUT_OF_MEMORY!;
 	libc::snprintf(str, len + 1, "Title of %.*s", (int)url.len, url.ptr);
 	return { dupe(Head { .title = dupe(str[..len - 1])? })? };
@@ -358,7 +358,7 @@ if.then15:                                        ; preds = %if.exit9
   store ptr null, ptr %25, align 8
   %26 = load %Head, ptr %literal18, align 8
   store %Head %26, ptr %value, align 8
-  %27 = call ptr @std_core_mem_alloc(i64 8)
+  %27 = call ptr @std_core_mem_malloc(i64 8)
   store ptr %27, ptr %temp, align 8
   %28 = load ptr, ptr %temp, align 8
   %not = icmp eq ptr %28, null
@@ -402,7 +402,7 @@ if.then27:                                        ; preds = %if.exit21
   store ptr null, ptr %literal32, align 8
   %39 = getelementptr inbounds %Head, ptr %literal32, i32 0, i32 0
   store %"char[]" zeroinitializer, ptr %value34, align 8
-  %40 = call ptr @std_core_mem_alloc(i64 16)
+  %40 = call ptr @std_core_mem_malloc(i64 16)
   store ptr %40, ptr %temp35, align 8
   %41 = load ptr, ptr %temp35, align 8
   %not36 = icmp eq ptr %41, null
@@ -426,7 +426,7 @@ noerr_block40:                                    ; preds = %if.exit38
   store ptr %44, ptr %39, align 8
   %45 = load %Head, ptr %literal32, align 8
   store %Head %45, ptr %value31, align 8
-  %46 = call ptr @std_core_mem_alloc(i64 8)
+  %46 = call ptr @std_core_mem_malloc(i64 8)
   store ptr %46, ptr %temp41, align 8
   %47 = load ptr, ptr %temp41, align 8
   %not42 = icmp eq ptr %47, null
@@ -462,7 +462,7 @@ if.exit47:                                        ; preds = %if.exit21
   %56 = load i32, ptr %len, align 4
   %siuiext = sext i32 %56 to i64
   %add = add i64 %siuiext, 1
-  %57 = call ptr @std_core_mem_alloc(i64 %add)
+  %57 = call ptr @std_core_mem_malloc(i64 %add)
   store ptr %57, ptr %str, align 8
   %58 = load ptr, ptr %str, align 8
   %not48 = icmp eq ptr %58, null
@@ -495,7 +495,7 @@ if.exit50:                                        ; preds = %if.exit47
   %71 = insertvalue %"char[]" undef, ptr %ptroffset, 0
   %72 = insertvalue %"char[]" %71, i64 %size, 1
   store %"char[]" %72, ptr %value60, align 8
-  %73 = call ptr @std_core_mem_alloc(i64 16)
+  %73 = call ptr @std_core_mem_malloc(i64 16)
   store ptr %73, ptr %temp61, align 8
   %74 = load ptr, ptr %temp61, align 8
   %not62 = icmp eq ptr %74, null
@@ -519,7 +519,7 @@ noerr_block66:                                    ; preds = %if.exit64
   store ptr %77, ptr %67, align 8
   %78 = load %Head, ptr %literal58, align 8
   store %Head %78, ptr %value57, align 8
-  %79 = call ptr @std_core_mem_alloc(i64 8)
+  %79 = call ptr @std_core_mem_malloc(i64 8)
   store ptr %79, ptr %temp67, align 8
   %80 = load ptr, ptr %temp67, align 8
   %not68 = icmp eq ptr %80, null