Complex numbers: complex64 complex128

16 files changed, 717 insertions, 490 deletions

diff --git a/build.bat b/build.bat
index c50fc93ef..51dfc84b4 100644
--- a/build.bat
+++ b/build.bat
@@ -4,7 +4,7 @@
 set exe_name=odin.exe
 
 :: Debug = 0, Release = 1
-set release_mode=1
+set release_mode=0
 set compiler_flags= -nologo -Oi -TC -fp:fast -fp:except- -Gm- -MP -FC -GS- -EHsc- -GR-
 
 if %release_mode% EQU 0 ( rem Debug
diff --git a/code/demo.odin b/code/demo.odin
index 3b78f7de3..e9eba17c8 100644
--- a/code/demo.odin
+++ b/code/demo.odin
@@ -1,320 +1,9 @@
-#import "atomic.odin";
-#import "hash.odin";
-#import "mem.odin";
-#import "opengl.odin";
-#import "strconv.odin";
-#import "sync.odin";
-#import win32 "sys/windows.odin";
-
 #import "fmt.odin";
 #import "os.odin";
 #import "math.odin";
 
 
 main :: proc() {
-when true {
-/*
-	Added:
-		* Unexported entities and fields using an underscore prefix
-			- See `sync.odin` and explain
-
-	Removed:
-	 * Maybe/option types
-	 * Remove `type` keyword and other "reserved" keywords
-	 * ..< and ... removed and replace with .. (half-closed range)
-
-	Changed:
-	 * `compile_assert` and `assert`return the value of the condition for semantic reasons
-	 * thread_local -> #thread_local
-	 * #include -> #load
-	 * Files only get checked if they are actually used
-	 * match x in y {} // For type match statements
-	 * Version numbering now starts from 0.1.0 and uses the convention:
-	 	- major.minor.patch
-	 * Core library additions to Windows specific stuff
- */
-
-	{
-		Fruit :: enum {
-			APPLE,
-			BANANA,
-			COCONUT,
-		}
-		fmt.println(Fruit.names);
-	}
-
-	{
-		A :: struct           {x, y: f32};
-		B :: struct #align 16 {x, y: f32};
-		fmt.println("align_of(A) =", align_of(A));
-		fmt.println("align_of(B) =", align_of(B));
-	}
-
-	{
-		// Removal of ..< and ...
-		for i in 0..16 {
-		}
-		// Is similar to
-		for _i := 0; _i < 16; _i++ { immutable i := _i;
-		}
-	}
-
-	{
-	#label thing
-		for i in 0..10 {
-			for j in i+1..10 {
-				if j == 2 {
-					fmt.println(i, j);
-					continue thing;
-				}
-				if j == 3 {
-					break thing;
-				}
-			}
-		}
-
-		// Works with, `for`, `for in`, `match`, `match in`
-		// NOTE(bill): This solves most of the problems I need `goto` for
-	}
-
-	{
-		t := type_info(int);
-		using Type_Info;
-		match i in t {
-		case Integer, Float:
-			fmt.println("It's a number");
-		}
-
-
-		x: any = 123;
-	#label foo
-		match i in x {
-		case int, f32:
-			fmt.println("It's an int or f32");
-			break foo;
-		}
-	}
-
-	{
-		cond := true;
-		x: int;
-		if cond {
-			x = 3;
-		} else {
-			x = 4;
-		}
-
-
-		// Ternary operator
-		y := cond ? 3 : 4;
-
-		FOO :: true ? 123 : 432; // Constant ternary expression
-		fmt.println("Ternary values:", y, FOO);
-	}
-
-	{
-		// Slices now store a capacity
-		buf: [256]byte;
-		s: []byte;
-		s = buf[..0]; // == buf[0..0];
-		fmt.println("count =", s.count);
-		fmt.println("capacity =", s.capacity);
-		append(s, 1, 2, 3);
-		fmt.println(s);
-
-		s = buf[1..2..3];
-		fmt.println("count =", s.count);
-		fmt.println("capacity =", s.capacity);
-		fmt.println(s);
-
-		clear(s); // Sets count to zero
-		s.count = 0; // Equivalent
-	}
-
-	{
-		Foo :: struct {
-			x, y, z: f32,
-			ok:      bool,
-			flags:   u32,
-		}
-		foo_array: [256]Foo;
-		foo_as_bytes: []byte = slice_to_bytes(foo_array[..]);
-		// Useful for things like
-		// os.write(handle, foo_as_bytes);
-
-		foo_slice := slice_ptr(cast(^Foo)foo_as_bytes.data, foo_as_bytes.count/size_of(Foo), foo_as_bytes.capacity/size_of(Foo));
-		// Question: Should there be a bytes_to_slice procedure or is it clearer to do this even if it is error prone?
-		// And if so what would the syntax be?
-		// slice_transmute([]Foo, foo_as_bytes);
-	}
-
-	{
-		Vec3 :: [vector 3]f32;
-
-		x := Vec3{1, 2, 3};
-		y := Vec3{4, 5, 6};
-		fmt.println(x < y);
-		fmt.println(x + y);
-		fmt.println(x - y);
-		fmt.println(x * y);
-		fmt.println(x / y);
-
-		for i in x {
-			fmt.println(i);
-		}
-
-		compile_assert(size_of([vector 7]bool) == size_of([7]bool));
-		compile_assert(size_of([vector 7]i32) == size_of([7]i32));
-		// align_of([vector 7]i32) != align_of([7]i32) // this may be the case
-	}
-
-	{
-		// fmt.* changes
-		// bprint* returns `int` (bytes written)
-		// sprint* returns `string` (bytes written as a string)
-
-		data: [256]byte;
-		str := fmt.sprintf(data[..0], "Hellope %d %s %c", 123, "others", '!');
-		fmt.println(str);
-
-		buf := data[..0];
-		count := fmt.bprintf(^buf, "Hellope %d %s %c", 123, "others", '!');
-		fmt.println(cast(string)buf[..count]);
-
-		// NOTE(bill): We may change this but because this is a library feature, I am not that bothered yet
-	}
-
-	{
-		x: [dynamic]f64;
-		reserve(x, 16);
-		defer free(x); // `free` is overloaded for numerous types
-		// Number literals can have underscores in them for readability
-		append(x, 2_000_000.500_000, 3, 5, 7); // variadic append
-
-		for p, i in x {
-			if i > 0 { fmt.print(", "); }
-			fmt.print(p);
-		}
-		fmt.println();
-	}
-
-	{
-		// Dynamic array "literals"
-		x := [dynamic]f64{2_000_000.500_000, 3, 5, 7};
-		defer free(x);
-		fmt.println(x); // fmt.print* supports printing of dynamic types
-		clear(x);
-		fmt.println(x);
-	}
-
-	{
-		m: map[f32]int;
-		reserve(m, 16);
-		defer free(m);
-
-		m[1.0] = 1278;
-		m[2.0] = 7643;
-		m[3.0] = 564;
-		_, ok := m[3.0];
-		c := m[3.0];
-		assert(ok && c == 564);
-
-		fmt.print("map[");
-		i := 0;
-		for val, key in m {
-			if i > 0 {
-				fmt.print(", ");
-			}
-			fmt.printf("%v=%v", key, val);
-			i += 1;
-		}
-		fmt.println("]");
-	}
-	{
-		m := map[string]u32{
-			"a" = 56,
-			"b" = 13453,
-			"c" = 7654,
-		};
-		defer free(m);
-
-		c := m["c"];
-		_, ok := m["c"];
-		assert(ok && c == 7654);
-		fmt.println(m);
-
-		delete(m, "c"); // deletes entry with key "c"
-		_, found := m["c"];
-		assert(!found);
-
-		fmt.println(m);
-		clear(m);
-		fmt.println(m);
-
-		// NOTE: Fixed size maps are planned but we have not yet implemented
-		// them as we have had no need for them as of yet
-	}
-
-	{
-		Vector3 :: struct{x, y, z: f32};
-		Quaternion :: struct{x, y, z, w: f32};
-
-		Entity :: union {
-			// Common Fields
-			id:             u64,
-			name:           string,
-			using position: Vector3,
-			orientation:    Quaternion,
-			flags:          u32,
-
-			// Variants
-			Frog{
-				ribbit_volume: f32,
-				jump_height:   f32,
-			},
-			Door{
-				openness: f32,
-			},
-			Map{
-				width, height:   f32,
-				place_positions: []Vector3,
-				place_names:     []string,
-			},
-		}
-
-		entity: Entity;
-		// implicit conversion from variant to base type
-		entity = Entity.Frog{
-			id = 1337,
-			ribbit_volume = 0.5,
-			jump_height = 2.1,
-			/*other data */
-		};
-
-		entity.name = "Frank";
-		entity.position = Vector3{1, 4, 9};
-
-		using Entity;
-		match e in entity {
-		case Frog:
-			fmt.println("Ribbit");
-		case Door:
-			fmt.println("Creak");
-		case Map:
-			fmt.println("Rustle");
-		default:
-			fmt.println("Just a normal entity");
-		}
-
-		if frog, ok := union_cast(Frog)entity; ok {
-			fmt.printf("The frog jumps %f feet high at %v\n", frog.jump_height, frog.position);
-		}
-
-		// Panics if not the correct type
-		frog: Frog;
-		frog = union_cast(Frog)entity;
-		frog, _ = union_cast(Frog)entity; // ignore error and force cast
-	}
-}
+	x := 1+2i;
+	fmt.printf("%v\n", x);
 }
-
diff --git a/core/_preload.odin b/core/_preload.odin
index 3b3e60e0f..fd61abf69 100644
--- a/core/_preload.odin
+++ b/core/_preload.odin
@@ -41,6 +41,7 @@ Type_Info :: union {
 	Named{name: string, base: ^Type_Info},
 	Integer{size: int, signed: bool},
 	Float{size: int},
+	Complex{size: int},
 	String{},
 	Boolean{},
 	Any{},
diff --git a/core/fmt.odin b/core/fmt.odin
index 0f26b82fc..1a8766b3d 100644
--- a/core/fmt.odin
+++ b/core/fmt.odin
@@ -110,6 +110,11 @@ write_type :: proc(buf: ^[]byte, ti: ^Type_Info) {
 		case 4: write_string(buf, "f32");
 		case 8: write_string(buf, "f64");
 		}
+	case Complex:
+		match info.size {
+		case 8:  write_string(buf, "complex64");
+		case 16: write_string(buf, "complex128");
+		}
 	case String:  write_string(buf, "string");
 	case Boolean: write_string(buf, "bool");
 	case Pointer:
@@ -733,6 +738,7 @@ fmt_value :: proc(fi: ^Fmt_Info, v: any, verb: rune) {
 
 	case Boolean: fmt_arg(fi, v, verb);
 	case Float:   fmt_arg(fi, v, verb);
+	case Complex: fmt_arg(fi, v, verb);
 	case Integer: fmt_arg(fi, v, verb);
 	case String:  fmt_arg(fi, v, verb);
 
@@ -883,6 +889,24 @@ fmt_value :: proc(fi: ^Fmt_Info, v: any, verb: rune) {
 	}
 }
 
+fmt_complex :: proc(fi: ^Fmt_Info, c: complex128, bits: int, verb: rune) {
+	match verb {
+	case 'f', 'F', 'v':
+		r := real(c);
+		i := imag(c);
+		fmt_float(fi, r, bits/2, verb);
+		if !fi.plus && i >= 0 {
+			write_rune(fi.buf, '+');
+		}
+		fmt_float(fi, i, bits/2, verb);
+		write_rune(fi.buf, 'i');
+
+	default:
+		fmt_bad_verb(fi, verb);
+		return;
+	}
+}
+
 fmt_arg :: proc(fi: ^Fmt_Info, arg: any, verb: rune) {
 	if arg.data == nil || arg.type_info == nil {
 		write_string(fi.buf, "<nil>");
@@ -903,9 +927,11 @@ fmt_arg :: proc(fi: ^Fmt_Info, arg: any, verb: rune) {
 	base_arg := arg;
 	base_arg.type_info = type_info_base(base_arg.type_info);
 	match a in base_arg {
-	case bool:    fmt_bool(fi, a, verb);
-	case f32:     fmt_float(fi, cast(f64)a, 32, verb);
-	case f64:     fmt_float(fi, a, 64, verb);
+	case bool:       fmt_bool(fi, a, verb);
+	case f32:        fmt_float(fi, cast(f64)a, 32, verb);
+	case f64:        fmt_float(fi, a, 64, verb);
+	case complex64:  fmt_complex(fi, cast(complex128)a, 64, verb);
+	case complex128: fmt_complex(fi, a, 128, verb);
 
 	case int:     fmt_int(fi, cast(u64)a, true,  8*size_of(int), verb);
 	case i8:      fmt_int(fi, cast(u64)a, true,  8, verb);
diff --git a/core/math.odin b/core/math.odin
index 6ba540ac0..15a445831 100644
--- a/core/math.odin
+++ b/core/math.odin
@@ -27,14 +27,14 @@ Mat4 :: [4]Vec4;
 sqrt :: proc(x: f32) -> f32 #foreign __llvm_core "llvm.sqrt.f32";
 sqrt :: proc(x: f64) -> f64 #foreign __llvm_core "llvm.sqrt.f64";
 
-sin  :: proc(x: f32) -> f32 #foreign __llvm_core "llvm.sin.f32";
-sin  :: proc(x: f64) -> f64 #foreign __llvm_core "llvm.sin.f64";
+sin  :: proc(θ: f32) -> f32 #foreign __llvm_core "llvm.sin.f32";
+sin  :: proc(θ: f64) -> f64 #foreign __llvm_core "llvm.sin.f64";
 
-cos  :: proc(x: f32) -> f32 #foreign __llvm_core "llvm.cos.f32";
-cos  :: proc(x: f64) -> f64 #foreign __llvm_core "llvm.cos.f64";
+cos  :: proc(θ: f32) -> f32 #foreign __llvm_core "llvm.cos.f32";
+cos  :: proc(θ: f64) -> f64 #foreign __llvm_core "llvm.cos.f64";
 
-tan  :: proc(x: f32) -> f32 #inline { return sin(x)/cos(x); }
-tan  :: proc(x: f64) -> f64 #inline { return sin(x)/cos(x); }
+tan  :: proc(θ: f32) -> f32 #inline { return sin(θ)/cos(θ); }
+tan  :: proc(θ: f64) -> f64 #inline { return sin(θ)/cos(θ); }
 
 pow  :: proc(x, power: f32) -> f32 #foreign __llvm_core "llvm.pow.f32";
 pow  :: proc(x, power: f64) -> f64 #foreign __llvm_core "llvm.pow.f64";
diff --git a/core/os_windows.odin b/core/os_windows.odin
index 1adc80d18..b834a2726 100644
--- a/core/os_windows.odin
+++ b/core/os_windows.odin
@@ -1,6 +1,4 @@
-#import w "sys/windows.odin";
-#import "fmt.odin";
-
+#import win32 "sys/windows.odin";
 
 Handle    :: int;
 File_Time :: u64;
@@ -50,6 +48,8 @@ WSAECONNRESET:             Errno : 10054;
 ERROR_FILE_IS_PIPE: Errno : 1<<29 + 0;
 
 
+// "Argv" arguments converted to Odin strings
+args := _alloc_command_line_arguments();
 
 
 open :: proc(path: string, mode: int, perm: u32) -> (Handle, Errno) {
@@ -59,22 +59,22 @@ open :: proc(path: string, mode: int, perm: u32) -> (Handle, Errno) {
 
 	access: u32;
 	match mode & (O_RDONLY|O_WRONLY|O_RDWR) {
-	case O_RDONLY: access = w.FILE_GENERIC_READ;
-	case O_WRONLY: access = w.FILE_GENERIC_WRITE;
-	case O_RDWR:   access = w.FILE_GENERIC_READ | w.FILE_GENERIC_WRITE;
+	case O_RDONLY: access = win32.FILE_GENERIC_READ;
+	case O_WRONLY: access = win32.FILE_GENERIC_WRITE;
+	case O_RDWR:   access = win32.FILE_GENERIC_READ | win32.FILE_GENERIC_WRITE;
 	}
 
 	if mode&O_CREAT != 0 {
-		access |= w.FILE_GENERIC_WRITE;
+		access |= win32.FILE_GENERIC_WRITE;
 	}
 	if mode&O_APPEND != 0 {
-		access &~= w.FILE_GENERIC_WRITE;
-		access |=  w.FILE_APPEND_DATA;
+		access &~= win32.FILE_GENERIC_WRITE;
+		access |=  win32.FILE_APPEND_DATA;
 	}
 
-	share_mode := cast(u32)(w.FILE_SHARE_READ|w.FILE_SHARE_WRITE);
-	sa: ^w.Security_Attributes = nil;
-	sa_inherit := w.Security_Attributes{length = size_of(w.Security_Attributes), inherit_handle = 1};
+	share_mode := cast(u32)(win32.FILE_SHARE_READ|win32.FILE_SHARE_WRITE);
+	sa: ^win32.Security_Attributes = nil;
+	sa_inherit := win32.Security_Attributes{length = size_of(win32.Security_Attributes), inherit_handle = 1};
 	if mode&O_CLOEXEC == 0 {
 		sa = ^sa_inherit;
 	}
@@ -82,37 +82,37 @@ open :: proc(path: string, mode: int, perm: u32) -> (Handle, Errno) {
 	create_mode: u32;
 	match {
 	case mode&(O_CREAT|O_EXCL) == (O_CREAT | O_EXCL):
-		create_mode = w.CREATE_NEW;
+		create_mode = win32.CREATE_NEW;
 	case mode&(O_CREAT|O_TRUNC) == (O_CREAT | O_TRUNC):
-		create_mode = w.CREATE_ALWAYS;
+		create_mode = win32.CREATE_ALWAYS;
 	case mode&O_CREAT == O_CREAT:
-		create_mode = w.OPEN_ALWAYS;
+		create_mode = win32.OPEN_ALWAYS;
 	case mode&O_TRUNC == O_TRUNC:
-		create_mode = w.TRUNCATE_EXISTING;
+		create_mode = win32.TRUNCATE_EXISTING;
 	default:
-		create_mode = w.OPEN_EXISTING;
+		create_mode = win32.OPEN_EXISTING;
 	}
 
 	buf: [300]byte;
 	copy(buf[..], cast([]byte)path);
 
-	handle := cast(Handle)w.CreateFileA(^buf[0], access, share_mode, sa, create_mode, w.FILE_ATTRIBUTE_NORMAL, nil);
+	handle := cast(Handle)win32.CreateFileA(^buf[0], access, share_mode, sa, create_mode, win32.FILE_ATTRIBUTE_NORMAL, nil);
 	if handle != INVALID_HANDLE {
 		return handle, ERROR_NONE;
 	}
-	err := w.GetLastError();
+	err := win32.GetLastError();
 	return INVALID_HANDLE, cast(Errno)err;
 }
 
 close :: proc(fd: Handle) {
-	w.CloseHandle(cast(w.Handle)fd);
+	win32.CloseHandle(cast(win32.Handle)fd);
 }
 
 write :: proc(fd: Handle, data: []byte) -> (int, Errno) {
 	bytes_written: i32;
-	e := w.WriteFile(cast(w.Handle)fd, data.data, cast(i32)data.count, ^bytes_written, nil);
-	if e == w.FALSE {
-		err := w.GetLastError();
+	e := win32.WriteFile(cast(win32.Handle)fd, data.data, cast(i32)data.count, ^bytes_written, nil);
+	if e == win32.FALSE {
+		err := win32.GetLastError();
 		return 0, cast(Errno)err;
 	}
 	return cast(int)bytes_written, ERROR_NONE;
@@ -120,31 +120,30 @@ write :: proc(fd: Handle, data: []byte) -> (int, Errno) {
 
 read :: proc(fd: Handle, data: []byte) -> (int, Errno) {
 	bytes_read: i32;
-	e := w.ReadFile(cast(w.Handle)fd, data.data, cast(u32)data.count, ^bytes_read, nil);
-	if e == w.FALSE {
-		err := w.GetLastError();
+	e := win32.ReadFile(cast(win32.Handle)fd, data.data, cast(u32)data.count, ^bytes_read, nil);
+	if e == win32.FALSE {
+		err := win32.GetLastError();
 		return 0, cast(Errno)err;
 	}
 	return cast(int)bytes_read, ERROR_NONE;
 }
 
 seek :: proc(fd: Handle, offset: i64, whence: int) -> (i64, Errno) {
-	using w;
 	w: u32;
 	match whence {
-	case 0: w = FILE_BEGIN;
-	case 1: w = FILE_CURRENT;
-	case 2: w = FILE_END;
+	case 0: w = win32.FILE_BEGIN;
+	case 1: w = win32.FILE_CURRENT;
+	case 2: w = win32.FILE_END;
 	}
 	hi := cast(i32)(offset>>32);
 	lo := cast(i32)(offset);
-	ft := GetFileType(cast(Handle)fd);
-	if ft == FILE_TYPE_PIPE {
+	ft := win32.GetFileType(cast(win32.Handle)fd);
+	if ft == win32.FILE_TYPE_PIPE {
 		return 0, ERROR_FILE_IS_PIPE;
 	}
-	dw_ptr := SetFilePointer(cast(Handle)fd, lo, ^hi, w);
-	if dw_ptr == INVALID_SET_FILE_POINTER {
-		err := GetLastError();
+	dw_ptr := win32.SetFilePointer(cast(win32.Handle)fd, lo, ^hi, w);
+	if dw_ptr == win32.INVALID_SET_FILE_POINTER {
+		err := win32.GetLastError();
 		return 0, cast(Errno)err;
 	}
 	return cast(i64)hi<<32 + cast(i64)dw_ptr, ERROR_NONE;
@@ -152,14 +151,14 @@ seek :: proc(fd: Handle, offset: i64, whence: int) -> (i64, Errno) {
 
 
 // NOTE(bill): Uses startup to initialize it
-stdin  := get_std_handle(w.STD_INPUT_HANDLE);
-stdout := get_std_handle(w.STD_OUTPUT_HANDLE);
-stderr := get_std_handle(w.STD_ERROR_HANDLE);
+stdin  := get_std_handle(win32.STD_INPUT_HANDLE);
+stdout := get_std_handle(win32.STD_OUTPUT_HANDLE);
+stderr := get_std_handle(win32.STD_ERROR_HANDLE);
 
 
 get_std_handle :: proc(h: int) -> Handle {
-	fd := w.GetStdHandle(cast(i32)h);
-	w.SetHandleInformation(fd, w.HANDLE_FLAG_INHERIT, 0);
+	fd := win32.GetStdHandle(cast(i32)h);
+	win32.SetHandleInformation(fd, win32.HANDLE_FLAG_INHERIT, 0);
 	return cast(Handle)fd;
 }
 
@@ -169,23 +168,23 @@ get_std_handle :: proc(h: int) -> Handle {
 
 
 last_write_time :: proc(fd: Handle) -> File_Time {
-	file_info: w.By_Handle_File_Information;
-	w.GetFileInformationByHandle(cast(w.Handle)fd, ^file_info);
+	file_info: win32.By_Handle_File_Information;
+	win32.GetFileInformationByHandle(cast(win32.Handle)fd, ^file_info);
 	lo := cast(File_Time)file_info.last_write_time.lo;
 	hi := cast(File_Time)file_info.last_write_time.hi;
 	return lo | hi << 32;
 }
 
 last_write_time_by_name :: proc(name: string) -> File_Time {
-	last_write_time: w.Filetime;
-	data: w.File_Attribute_Data;
+	last_write_time: win32.Filetime;
+	data: win32.File_Attribute_Data;
 	buf: [1024]byte;
 
 	assert(buf.count > name.count);
 
 	copy(buf[..], cast([]byte)name);
 
-	if w.GetFileAttributesExA(^buf[0], w.GetFileExInfoStandard, ^data) != 0 {
+	if win32.GetFileAttributesExA(^buf[0], win32.GetFileExInfoStandard, ^data) != 0 {
 		last_write_time = data.last_write_time;
 	}
 
@@ -209,7 +208,7 @@ read_entire_file :: proc(name: string) -> ([]byte, bool) {
 	defer close(fd);
 
 	length: i64;
-	file_size_ok := w.GetFileSizeEx(cast(w.Handle)fd, ^length) != 0;
+	file_size_ok := win32.GetFileSizeEx(cast(win32.Handle)fd, ^length) != 0;
 	if !file_size_ok {
 		return nil, false;
 	}
@@ -232,7 +231,7 @@ read_entire_file :: proc(name: string) -> ([]byte, bool) {
 			to_read = MAX;
 		}
 
-		w.ReadFile(cast(w.Handle)fd, ^data[total_read], to_read, ^single_read_length, nil);
+		win32.ReadFile(cast(win32.Handle)fd, ^data[total_read], to_read, ^single_read_length, nil);
 		if single_read_length <= 0 {
 			free(data);
 			return nil, false;
@@ -247,7 +246,7 @@ read_entire_file :: proc(name: string) -> ([]byte, bool) {
 
 
 heap_alloc :: proc(size: int) -> rawptr {
-	return w.HeapAlloc(w.GetProcessHeap(), w.HEAP_ZERO_MEMORY, size);
+	return win32.HeapAlloc(win32.GetProcessHeap(), win32.HEAP_ZERO_MEMORY, size);
 }
 heap_resize :: proc(ptr: rawptr, new_size: int) -> rawptr {
 	if new_size == 0 {
@@ -257,25 +256,89 @@ heap_resize :: proc(ptr: rawptr, new_size: int) -> rawptr {
 	if ptr == nil {
 		return heap_alloc(new_size);
 	}
-	return w.HeapReAlloc(w.GetProcessHeap(), w.HEAP_ZERO_MEMORY, ptr, new_size);
+	return win32.HeapReAlloc(win32.GetProcessHeap(), win32.HEAP_ZERO_MEMORY, ptr, new_size);
 }
 heap_free :: proc(ptr: rawptr) {
 	if ptr == nil {
 		return;
 	}
-	w.HeapFree(w.GetProcessHeap(), 0, ptr);
+	win32.HeapFree(win32.GetProcessHeap(), 0, ptr);
 }
 
 
 exit :: proc(code: int) {
-	w.ExitProcess(cast(u32)code);
+	win32.ExitProcess(cast(u32)code);
 }
 
 
 
 current_thread_id :: proc() -> int {
-	return cast(int)w.GetCurrentThreadId();
+	return cast(int)win32.GetCurrentThreadId();
 }
 
 
 
+
+_alloc_command_line_arguments :: proc() -> []string {
+	alloc_ucs2_to_utf8 :: proc(wstr: ^u16) -> string {
+		wstr_len := 0;
+		for (wstr+wstr_len)^ != 0 {
+			wstr_len++;
+		}
+		len := 2*wstr_len-1;
+		buf := new_slice(byte, len+1);
+		str := slice_ptr(wstr, wstr_len+1);
+
+
+		i, j := 0, 0;
+		for str[j] != 0 {
+			match {
+			case str[j] < 0x80:
+				if i+1 > len {
+					return "";
+				}
+				buf[i] = cast(byte)str[j]; i++;
+				j++;
+			case str[j] < 0x800:
+				if i+2 > len {
+					return "";
+				}
+				buf[i] = cast(byte)(0xc0 + (str[j]>>6));   i++;
+				buf[i] = cast(byte)(0x80 + (str[j]&0x3f)); i++;
+				j++;
+			case 0xd800 <= str[j] && str[j] < 0xdc00:
+				if i+4 > len {
+					return "";
+				}
+				c := cast(rune)((str[j] - 0xd800) << 10) + cast(rune)((str[j+1]) - 0xdc00) + 0x10000;
+				buf[i] = cast(byte)(0xf0 +  (c >> 18));         i++;
+				buf[i] = cast(byte)(0x80 + ((c >> 12) & 0x3f)); i++;
+				buf[i] = cast(byte)(0x80 + ((c >>  6) & 0x3f)); i++;
+				buf[i] = cast(byte)(0x80 + ((c      ) & 0x3f)); i++;
+				j += 2;
+			case 0xdc00 <= str[j] && str[j] < 0xe000:
+				return "";
+			default:
+				if i+3 > len {
+					return "";
+				}
+				buf[i] = 0xe0 + cast(byte) (str[j] >> 12);         i++;
+				buf[i] = 0x80 + cast(byte)((str[j] >>  6) & 0x3f); i++;
+				buf[i] = 0x80 + cast(byte)((str[j]      ) & 0x3f); i++;
+				j++;
+			}
+		}
+
+		return cast(string)buf[..i];
+	}
+
+	arg_count: i32;
+	arg_list_ptr := win32.CommandLineToArgvW(win32.GetCommandLineW(), ^arg_count);
+	arg_list := new_slice(string, arg_count);
+	for _, i in arg_list {
+		arg_list[i] = alloc_ucs2_to_utf8((arg_list_ptr+i)^);
+	}
+	return arg_list;
+}
+
+
diff --git a/core/strconv.odin b/core/strconv.odin
index 5a14d6660..998129829 100644
--- a/core/strconv.odin
+++ b/core/strconv.odin
@@ -313,29 +313,16 @@ append_bits :: proc(buf: []byte, u: u64, base: int, is_signed: bool, bit_size: i
 	neg: bool;
 	u, neg = is_integer_negative(u, is_signed, bit_size);
 
-	if is_pow2(cast(i64)base) {
-		b := cast(u64)base;
-		m := cast(uint)b - 1;
-		for u >= b {
-			i--;
-			a[i] = digits[cast(uint)u & m];
-			u >>= b;
-		}
-		i--;
-		a[i] = digits[cast(uint)u];
-	} else {
-		b := cast(u64)base;
-		for u >= b {
-			i--;
-			q := u / b;
-			a[i] = digits[cast(uint)(u-q*b)];
-			u = q;
-		}
-
+	for b := cast(u64)base; u >= b; {
 		i--;
-		a[i] = digits[cast(uint)u];
+		q := u / b;
+		a[i] = digits[cast(uint)(u-q*b)];
+		u = q;
 	}
 
+	i--;
+	a[i] = digits[cast(uint)u];
+
 	if flags&Int_Flag.PREFIX != 0 {
 		ok := true;
 		match base {
diff --git a/src/check_expr.c b/src/check_expr.c
index db1bbd135..8c162e034 100644
--- a/src/check_expr.c
+++ b/src/check_expr.c
@@ -1754,18 +1754,37 @@ bool check_representable_as_constant(Checker *c, ExactValue in_value, Type *type
 		if (v.kind != ExactValue_Float) {
 			return false;
 		}
+		if (out_value) *out_value = v;
+
 
 		switch (type->Basic.kind) {
-		// case Basic_f16:
 		case Basic_f32:
 		case Basic_f64:
-		// case Basic_f128:
-			if (out_value) *out_value = v;
 			return true;
 
 		case Basic_UntypedFloat:
 			return true;
 		}
+	} else if (is_type_complex(type)) {
+		ExactValue v = exact_value_to_complex(in_value);
+		if (v.kind != ExactValue_Complex) {
+			return false;
+		}
+
+		switch (type->Basic.kind) {
+		case Basic_complex64:
+		case Basic_complex128: {
+			ExactValue real = exact_value_real(v);
+			ExactValue imag = exact_value_imag(v);
+			if (real.kind != ExactValue_Invalid &&
+			    imag.kind != ExactValue_Invalid) {
+				if (out_value) *out_value = exact_binary_operator_value(Token_Add, real, exact_value_make_imag(imag));
+				return true;
+			}
+		} break;
+		}
+
+		return false;
 	} else if (is_type_pointer(type)) {
 		if (in_value.kind == ExactValue_Pointer) {
 			return true;
@@ -2190,6 +2209,10 @@ bool check_is_castable_to(Checker *c, Operand *operand, Type *y) {
 		}
 	}
 
+	if (is_type_complex(src) && is_type_complex(dst)) {
+		return true;
+	}
+
 	// Cast between pointers
 	if (is_type_pointer(src) && is_type_pointer(dst)) {
 		Type *s = base_type(type_deref(src));
@@ -3568,6 +3591,129 @@ bool check_builtin_procedure(Checker *c, Operand *operand, AstNode *call, i32 id
 		operand->mode = Addressing_Value;
 	} break;
 
+	case BuiltinProc_complex: {
+		// complex :: proc(real, imag: float_type) -> complex_type
+		Operand x = *operand;
+		Operand y = {0};
+
+		// NOTE(bill): Invalid will be the default till fixed
+		operand->type = t_invalid;
+		operand->mode = Addressing_Invalid;
+
+		check_expr(c, &y, ce->args.e[1]);
+		if (y.mode == Addressing_Invalid) {
+			return false;
+		}
+
+		u32 flag = 0;
+		if (is_type_untyped(x.type)) {
+			flag |= 1;
+		}
+		if (is_type_untyped(y.type)) {
+			flag |= 2;
+		}
+		switch (flag) {
+		case 0: break;
+		case 1: convert_to_typed(c, &x, y.type, 0); break;
+		case 2: convert_to_typed(c, &y, x.type, 0); break;
+		case 3: {
+			if (x.mode == Addressing_Constant && y.mode == Addressing_Constant)  {
+				if (is_type_numeric(x.type) && exact_value_imag(x.value).value_float == 0) {
+					x.type = t_untyped_float;
+				}
+				if (is_type_numeric(y.type) && exact_value_imag(y.value).value_float == 0) {
+					y.type = t_untyped_float;
+				}
+			} else {
+				convert_to_typed(c, &x, t_f64, 0);
+				convert_to_typed(c, &y, t_f64, 0);
+			}
+		} break;
+		}
+
+		if (x.mode == Addressing_Invalid || y.mode == Addressing_Invalid) {
+			return false;
+		}
+
+		if (!are_types_identical(x.type, y.type)) {
+			gbString type_x = type_to_string(x.type);
+			gbString type_y = type_to_string(y.type);
+			error_node(call,
+			      "Mismatched types to `complex`, `%s` vs `%s`",
+			      type_x, type_y);
+			gb_string_free(type_y);
+			gb_string_free(type_x);
+			return false;
+		}
+
+		if (!is_type_float(x.type)) {
+			gbString s = type_to_string(x.type);
+			error_node(call, "Arguments have type `%s`, expected a floating point", s);
+			gb_string_free(s);
+			return false;
+		}
+
+		if (x.mode == Addressing_Constant && y.mode == Addressing_Constant) {
+			operand->value = exact_binary_operator_value(Token_Add, x.value, y.value);
+			operand->mode = Addressing_Constant;
+		} else {
+			operand->mode = Addressing_Value;
+		}
+
+		BasicKind kind = core_type(x.type)->Basic.kind;
+		switch (kind) {
+		case Basic_f32:          operand->type = t_complex64;       break;
+		case Basic_f64:          operand->type = t_complex128;      break;
+		case Basic_UntypedFloat: operand->type = t_untyped_complex; break;
+		default: GB_PANIC("Invalid type"); break;
+		}
+	} break;
+
+	case BuiltinProc_real:
+	case BuiltinProc_imag: {
+		// real :: proc(c: complex_type) -> float_type
+		// imag :: proc(c: complex_type) -> float_type
+
+		Operand *x = operand;
+		if (is_type_untyped(x->type)) {
+			if (x->mode == Addressing_Constant) {
+				if (is_type_numeric(x->type)) {
+					x->type = t_untyped_complex;
+				}
+			} else {
+				convert_to_typed(c, x, t_complex128, 0);
+				if (x->mode == Addressing_Invalid) {
+					return false;
+				}
+			}
+		}
+
+		if (!is_type_complex(x->type)) {
+			gbString s = type_to_string(x->type);
+			error_node(call, "Argument has type `%s`, expected a complex type", s);
+			gb_string_free(s);
+			return false;
+		}
+
+		if (x->mode == Addressing_Constant) {
+			if (id == BuiltinProc_real) {
+				x->value = exact_value_real(x->value);
+			} else {
+				x->value = exact_value_imag(x->value);
+			}
+		} else {
+			x->mode = Addressing_Value;
+		}
+
+		BasicKind kind = core_type(x->type)->Basic.kind;
+		switch (kind) {
+		case Basic_complex64:      x->type = t_f32;           break;
+		case Basic_complex128:     x->type = t_f64;           break;
+		case Basic_UntypedComplex: x->type = t_untyped_float; break;
+		default: GB_PANIC("Invalid type"); break;
+		}
+	} break;
+
 	case BuiltinProc_slice_ptr: {
 		// slice_ptr :: proc(a: ^T, len: int) -> []T
 		// slice_ptr :: proc(a: ^T, len, cap: int) -> []T
@@ -4405,6 +4551,7 @@ ExprKind check_expr_base_internal(Checker *c, Operand *o, AstNode *node, Type *t
 		switch (bl->kind) {
 		case Token_Integer: t = t_untyped_integer; break;
 		case Token_Float:   t = t_untyped_float;   break;
+		case Token_Imag:    t = t_untyped_complex; break;
 		case Token_String:  t = t_untyped_string;  break;
 		case Token_Rune:    t = t_untyped_rune;    break;
 		default:            GB_PANIC("Unknown literal"); break;
diff --git a/src/checker.c b/src/checker.c
index 93187d50c..5f1352a29 100644
--- a/src/checker.c
+++ b/src/checker.c
@@ -52,6 +52,10 @@ typedef enum BuiltinProcId {
 
 	BuiltinProc_swizzle,
 
+	BuiltinProc_complex,
+	BuiltinProc_real,
+	BuiltinProc_imag,
+
 	// BuiltinProc_ptr_offset,
 	// BuiltinProc_ptr_sub,
 	BuiltinProc_slice_ptr,
@@ -87,8 +91,8 @@ gb_global BuiltinProc builtin_procs[BuiltinProc_Count] = {
 	{STR_LIT("type_info"),        1, false, Expr_Expr},
 	{STR_LIT("type_info_of_val"), 1, false, Expr_Expr},
 
-	{STR_LIT("compile_assert"),   1, false, Expr_Stmt},
-	{STR_LIT("assert"),           1, false, Expr_Stmt},
+	{STR_LIT("compile_assert"),   1, false, Expr_Expr},
+	{STR_LIT("assert"),           1, false, Expr_Expr},
 	{STR_LIT("panic"),            1, false, Expr_Stmt},
 
 	{STR_LIT("copy"),             2, false, Expr_Expr},
@@ -96,6 +100,10 @@ gb_global BuiltinProc builtin_procs[BuiltinProc_Count] = {
 
 	{STR_LIT("swizzle"),          1, true,  Expr_Expr},
 
+	{STR_LIT("complex"),          2, false, Expr_Expr},
+	{STR_LIT("real"),             1, false, Expr_Expr},
+	{STR_LIT("imag"),             1, false, Expr_Expr},
+
 	// {STR_LIT("ptr_offset"),       2, false, Expr_Expr},
 	// {STR_LIT("ptr_sub"),          2, false, Expr_Expr},
 	{STR_LIT("slice_ptr"),        2, true,   Expr_Expr},
@@ -940,6 +948,15 @@ void add_type_info_type(Checker *c, Type *t) {
 			add_type_info_type(c, t_type_info_ptr);
 			add_type_info_type(c, t_rawptr);
 			break;
+
+		case Basic_complex64:
+			add_type_info_type(c, t_type_info_float);
+			add_type_info_type(c, t_f32);
+			break;
+		case Basic_complex128:
+			add_type_info_type(c, t_type_info_float);
+			add_type_info_type(c, t_f64);
+			break;
 		}
 	} break;
 
@@ -1128,31 +1145,33 @@ void init_preload(Checker *c) {
 
 
 
-		if (record->variant_count != 19) {
+		if (record->variant_count != 20) {
 			compiler_error("Invalid `Type_Info` layout");
 		}
 		t_type_info_named         = record->variants[ 1]->type;
 		t_type_info_integer       = record->variants[ 2]->type;
 		t_type_info_float         = record->variants[ 3]->type;
-		t_type_info_string        = record->variants[ 4]->type;
-		t_type_info_boolean       = record->variants[ 5]->type;
-		t_type_info_any           = record->variants[ 6]->type;
-		t_type_info_pointer       = record->variants[ 7]->type;
-		t_type_info_procedure     = record->variants[ 8]->type;
-		t_type_info_array         = record->variants[ 9]->type;
-		t_type_info_dynamic_array = record->variants[10]->type;
-		t_type_info_slice         = record->variants[11]->type;
-		t_type_info_vector        = record->variants[12]->type;
-		t_type_info_tuple         = record->variants[13]->type;
-		t_type_info_struct        = record->variants[14]->type;
-		t_type_info_raw_union     = record->variants[15]->type;
-		t_type_info_union         = record->variants[16]->type;
-		t_type_info_enum          = record->variants[17]->type;
-		t_type_info_map           = record->variants[18]->type;
+		t_type_info_complex       = record->variants[ 4]->type;
+		t_type_info_string        = record->variants[ 5]->type;
+		t_type_info_boolean       = record->variants[ 6]->type;
+		t_type_info_any           = record->variants[ 7]->type;
+		t_type_info_pointer       = record->variants[ 8]->type;
+		t_type_info_procedure     = record->variants[ 9]->type;
+		t_type_info_array         = record->variants[10]->type;
+		t_type_info_dynamic_array = record->variants[11]->type;
+		t_type_info_slice         = record->variants[12]->type;
+		t_type_info_vector        = record->variants[13]->type;
+		t_type_info_tuple         = record->variants[14]->type;
+		t_type_info_struct        = record->variants[15]->type;
+		t_type_info_raw_union     = record->variants[16]->type;
+		t_type_info_union         = record->variants[17]->type;
+		t_type_info_enum          = record->variants[18]->type;
+		t_type_info_map           = record->variants[19]->type;
 
 		t_type_info_named_ptr         = make_type_pointer(c->allocator, t_type_info_named);
 		t_type_info_integer_ptr       = make_type_pointer(c->allocator, t_type_info_integer);
 		t_type_info_float_ptr         = make_type_pointer(c->allocator, t_type_info_float);
+		t_type_info_complex_ptr       = make_type_pointer(c->allocator, t_type_info_complex);
 		t_type_info_string_ptr        = make_type_pointer(c->allocator, t_type_info_string);
 		t_type_info_boolean_ptr       = make_type_pointer(c->allocator, t_type_info_boolean);
 		t_type_info_any_ptr           = make_type_pointer(c->allocator, t_type_info_any);
diff --git a/src/exact_value.c b/src/exact_value.c
index 7e8e69f50..f1da88fc6 100644
--- a/src/exact_value.c
+++ b/src/exact_value.c
@@ -12,21 +12,27 @@ typedef enum ExactValueKind {
 	ExactValue_String,
 	ExactValue_Integer,
 	ExactValue_Float,
+	ExactValue_Complex,
 	ExactValue_Pointer,
 	ExactValue_Compound, // TODO(bill): Is this good enough?
 
 	ExactValue_Count,
 } ExactValueKind;
 
+typedef struct Complex128 {
+	f64 real, imag;
+} Complex128;
+
 typedef struct ExactValue {
 	ExactValueKind kind;
 	union {
-		bool     value_bool;
-		String   value_string;
-		i64      value_integer; // NOTE(bill): This must be an integer and not a pointer
-		f64      value_float;
-		i64      value_pointer;
-		AstNode *value_compound;
+		bool       value_bool;
+		String     value_string;
+		i64        value_integer; // NOTE(bill): This must be an integer and not a pointer
+		f64        value_float;
+		i64        value_pointer;
+		Complex128 value_complex;
+		AstNode *  value_compound;
 	};
 } ExactValue;
 
@@ -66,6 +72,13 @@ ExactValue exact_value_float(f64 f) {
 	return result;
 }
 
+ExactValue exact_value_complex(f64 real, f64 imag) {
+	ExactValue result = {ExactValue_Complex};
+	result.value_complex.real = real;
+	result.value_complex.imag = imag;
+	return result;
+}
+
 ExactValue exact_value_pointer(i64 ptr) {
 	ExactValue result = {ExactValue_Pointer};
 	result.value_pointer = ptr;
@@ -113,9 +126,7 @@ ExactValue exact_value_integer_from_string(String string) {
 	return exact_value_integer(result);
 }
 
-
-
-ExactValue exact_value_float_from_string(String string) {
+f64 float_from_string(String string) {
 	isize i = 0;
 	u8 *str = string.text;
 	isize len = string.len;
@@ -190,8 +201,11 @@ ExactValue exact_value_float_from_string(String string) {
 		while (exp >   0) { scale *= 10.0; exp -=  1; }
 	}
 
-	f64 result = sign * (frac ? (value / scale) : (value * scale));
-	return exact_value_float(result);
+	return sign * (frac ? (value / scale) : (value * scale));
+}
+
+ExactValue exact_value_float_from_string(String string) {
+	return exact_value_float(float_from_string(string));
 }
 
 
@@ -200,6 +214,12 @@ ExactValue exact_value_from_basic_literal(Token token) {
 	case Token_String:  return exact_value_string(token.string);
 	case Token_Integer: return exact_value_integer_from_string(token.string);
 	case Token_Float:   return exact_value_float_from_string(token.string);
+	case Token_Imag: {
+		String str = token.string;
+		str.len--; // Ignore the `i`
+		f64 imag = float_from_string(str);
+		return exact_value_complex(0, imag);
+	}
 	case Token_Rune: {
 		Rune r = GB_RUNE_INVALID;
 		gb_utf8_decode(token.string.text, token.string.len, &r);
@@ -245,6 +265,57 @@ ExactValue exact_value_to_float(ExactValue v) {
 	return r;
 }
 
+ExactValue exact_value_to_complex(ExactValue v) {
+	switch (v.kind) {
+	case ExactValue_Integer:
+		return exact_value_complex(cast(i64)v.value_integer, 0);
+	case ExactValue_Float:
+		return exact_value_complex(v.value_float, 0);
+	case ExactValue_Complex:
+		return v;
+	}
+	ExactValue r = {ExactValue_Invalid};
+	return r;
+}
+
+ExactValue exact_value_real(ExactValue v) {
+	switch (v.kind) {
+	case ExactValue_Integer:
+	case ExactValue_Float:
+		return v;
+	case ExactValue_Complex:
+		return exact_value_float(v.value_complex.real);
+	}
+	ExactValue r = {ExactValue_Invalid};
+	return r;
+}
+
+ExactValue exact_value_imag(ExactValue v) {
+	switch (v.kind) {
+	case ExactValue_Integer:
+	case ExactValue_Float:
+		return exact_value_integer(0);
+	case ExactValue_Complex:
+		return exact_value_float(v.value_complex.imag);
+	}
+	ExactValue r = {ExactValue_Invalid};
+	return r;
+}
+
+ExactValue exact_value_make_imag(ExactValue v) {
+	switch (v.kind) {
+	case ExactValue_Integer:
+		return exact_value_complex(0, exact_value_to_float(v).value_float);
+	case ExactValue_Float:
+		return exact_value_complex(0, v.value_float);
+	default:
+		GB_PANIC("Expected an integer or float type for `exact_value_make_imag`");
+	}
+	ExactValue r = {ExactValue_Invalid};
+	return r;
+}
+
+
 
 ExactValue exact_unary_operator_value(TokenKind op, ExactValue v, i32 precision) {
 	switch (op) {
@@ -253,6 +324,7 @@ ExactValue exact_unary_operator_value(TokenKind op, ExactValue v, i32 precision)
 		case ExactValue_Invalid:
 		case ExactValue_Integer:
 		case ExactValue_Float:
+		case ExactValue_Complex:
 			return v;
 		}
 	} break;
@@ -271,6 +343,11 @@ ExactValue exact_unary_operator_value(TokenKind op, ExactValue v, i32 precision)
 			i.value_float = -i.value_float;
 			return i;
 		}
+		case ExactValue_Complex: {
+			f64 real = v.value_complex.real;
+			f64 imag = v.value_complex.imag;
+			return exact_value_complex(-real, -imag);
+		}
 		}
 	} break;
 
@@ -324,8 +401,10 @@ i32 exact_value_order(ExactValue v) {
 		return 2;
 	case ExactValue_Float:
 		return 3;
-	case ExactValue_Pointer:
+	case ExactValue_Complex:
 		return 4;
+	case ExactValue_Pointer:
+		return 5;
 
 	default:
 		GB_PANIC("How'd you get here? Invalid Value.kind");
@@ -346,6 +425,7 @@ void match_exact_values(ExactValue *x, ExactValue *y) {
 
 	case ExactValue_Bool:
 	case ExactValue_String:
+	case ExactValue_Complex:
 		return;
 
 	case ExactValue_Integer:
@@ -356,16 +436,23 @@ void match_exact_values(ExactValue *x, ExactValue *y) {
 			// TODO(bill): Is this good enough?
 			*x = exact_value_float(cast(f64)x->value_integer);
 			return;
+		case ExactValue_Complex:
+			*x = exact_value_complex(cast(f64)x->value_integer, 0);
+			return;
 		}
 		break;
 
 	case ExactValue_Float:
-		if (y->kind == ExactValue_Float)
+		if (y->kind == ExactValue_Float) {
 			return;
+		} else if (y->kind == ExactValue_Complex) {
+			*x = exact_value_to_complex(*x);
+			return;
+		}
 		break;
 	}
 
-	compiler_error("How'd you get here? Invalid ExactValueKind");
+	compiler_error("match_exact_values: How'd you get here? Invalid ExactValueKind %d", x->kind);
 }
 
 // TODO(bill): Allow for pointer arithmetic? Or are pointer slices good enough?
@@ -420,6 +507,37 @@ ExactValue exact_binary_operator_value(TokenKind op, ExactValue x, ExactValue y)
 		default: goto error;
 		}
 	} break;
+
+	case ExactValue_Complex: {
+		y = exact_value_to_complex(y);
+		f64 a = x.value_complex.real;
+		f64 b = x.value_complex.imag;
+		f64 c = y.value_complex.real;
+		f64 d = y.value_complex.imag;
+		f64 real = 0;
+		f64 imag = 0;
+		switch (op) {
+		case Token_Add:
+			real = a + c;
+			imag = b + d;
+			break;
+		case Token_Sub:
+			real = a - c;
+			imag = b - d;
+			break;
+		case Token_Mul:
+			real = (a*c - b*d);
+			imag = (b*c + a*d);
+			break;
+		case Token_Quo: {
+			f64 s = c*c + d*d;
+			real = (a*c + b*d)/s;
+			imag = (b*c - a*d)/s;
+		} break;
+		default: goto error;
+		}
+		return exact_value_complex(real, imag);
+	} break;
 	}
 
 error:
@@ -480,6 +598,17 @@ bool compare_exact_values(TokenKind op, ExactValue x, ExactValue y) {
 		}
 	} break;
 
+	case ExactValue_Complex: {
+		f64 a = x.value_complex.real;
+		f64 b = x.value_complex.imag;
+		f64 c = y.value_complex.real;
+		f64 d = y.value_complex.imag;
+		switch (op) {
+		case Token_CmpEq: return cmp_f64(a, c) == 0 && cmp_f64(b, d) == 0;
+		case Token_NotEq: return cmp_f64(a, c) != 0 || cmp_f64(b, d) != 0;
+		}
+	} break;
+
 	case ExactValue_String: {
 		String a = x.value_string;
 		String b = y.value_string;
diff --git a/src/ir.c b/src/ir.c
index fb638fb27..b5e01ee34 100644
--- a/src/ir.c
+++ b/src/ir.c
@@ -1653,6 +1653,7 @@ irValue *ir_addr_load(irProcedure *proc, irAddr addr) {
 }
 
 irValue *ir_emit_array_epi(irProcedure *proc, irValue *s, i32 index);
+irValue *ir_emit_struct_ev(irProcedure *proc, irValue *s, i32 index);
 
 irValue *ir_emit_ptr_offset(irProcedure *proc, irValue *ptr, irValue *offset) {
 	offset = ir_emit_conv(proc, offset, t_int);
@@ -1716,6 +1717,64 @@ irValue *ir_emit_arith(irProcedure *proc, TokenKind op, irValue *left, irValue *
 		return ir_emit_load(proc, res);
 	}
 
+	if (is_type_complex(t_left)) {
+		ir_emit_comment(proc, str_lit("complex.arith.begin"));
+		Type *tl = core_type(t_left);
+		Type *ft = t_f32;
+		if (tl->Basic.kind == Basic_complex128) {
+			ft = t_f64;
+		}
+
+		irValue *res = ir_add_local_generated(proc, type);
+		irValue *a = ir_emit_struct_ev(proc, left,  0);
+		irValue *b = ir_emit_struct_ev(proc, left,  1);
+		irValue *c = ir_emit_struct_ev(proc, right, 0);
+		irValue *d = ir_emit_struct_ev(proc, right, 1);
+
+		irValue *real = NULL;
+		irValue *imag = NULL;
+
+		switch (op) {
+		case Token_Add:
+			real = ir_emit_arith(proc, Token_Add, a, c, ft);
+			imag = ir_emit_arith(proc, Token_Add, b, d, ft);
+			break;
+		case Token_Sub:
+			real = ir_emit_arith(proc, Token_Sub, a, c, ft);
+			imag = ir_emit_arith(proc, Token_Sub, b, d, ft);
+			break;
+		case Token_Mul: {
+			irValue *x = ir_emit_arith(proc, Token_Mul, a, c, ft);
+			irValue *y = ir_emit_arith(proc, Token_Mul, b, d, ft);
+			real = ir_emit_arith(proc, Token_Sub, x, y, ft);
+			irValue *z = ir_emit_arith(proc, Token_Mul, b, c, ft);
+			irValue *w = ir_emit_arith(proc, Token_Mul, a, d, ft);
+			imag = ir_emit_arith(proc, Token_Add, z, w, ft);
+		} break;
+		case Token_Quo: {
+			irValue *s1 = ir_emit_arith(proc, Token_Mul, c, c, ft);
+			irValue *s2 = ir_emit_arith(proc, Token_Mul, d, d, ft);
+			irValue *s  = ir_emit_arith(proc, Token_Add, s1, s2, ft);
+
+			irValue *x = ir_emit_arith(proc, Token_Mul, a, c, ft);
+			irValue *y = ir_emit_arith(proc, Token_Mul, b, d, ft);
+			real = ir_emit_arith(proc, Token_Add, x, y, ft);
+			real = ir_emit_arith(proc, Token_Quo, real, s, ft);
+
+			irValue *z = ir_emit_arith(proc, Token_Mul, b, c, ft);
+			irValue *w = ir_emit_arith(proc, Token_Mul, a, d, ft);
+			imag = ir_emit_arith(proc, Token_Sub, z, w, ft);
+			imag = ir_emit_arith(proc, Token_Quo, imag, s, ft);
+		} break;
+		}
+
+		ir_emit_store(proc, ir_emit_struct_ep(proc, res, 0), real);
+		ir_emit_store(proc, ir_emit_struct_ep(proc, res, 1), imag);
+
+		ir_emit_comment(proc, str_lit("complex.end.begin"));
+		return ir_emit_load(proc, res);
+	}
+
 
 	if (op == Token_Add) {
 		if (is_type_pointer(t_left)) {
@@ -1890,6 +1949,15 @@ irValue *ir_emit_struct_ep(irProcedure *proc, irValue *s, i32 index) {
 		GB_ASSERT(t->Tuple.variable_count > 0);
 		GB_ASSERT(gb_is_between(index, 0, t->Tuple.variable_count-1));
 		result_type = make_type_pointer(a, t->Tuple.variables[index]->type);
+	} else if (is_type_complex(t)) {
+		Type *ft = t_f32;
+		if (core_type(t)->Basic.kind == Basic_complex128) {
+			ft = t_f64;
+		}
+		switch (index) {
+		case 0: result_type = make_type_pointer(a, ft); break;
+		case 1: result_type = make_type_pointer(a, ft); break;
+		}
 	} else if (is_type_slice(t)) {
 		switch (index) {
 		case 0: result_type = make_type_pointer(a, make_type_pointer(a, t->Slice.elem)); break;
@@ -1956,6 +2024,15 @@ irValue *ir_emit_struct_ev(irProcedure *proc, irValue *s, i32 index) {
 		GB_ASSERT(t->Tuple.variable_count > 0);
 		GB_ASSERT(gb_is_between(index, 0, t->Tuple.variable_count-1));
 		result_type = t->Tuple.variables[index]->type;
+	} else if (is_type_complex(t)) {
+		Type *ft = t_f32;
+		if (core_type(t)->Basic.kind == Basic_complex128) {
+			ft = t_f64;
+		}
+		switch (index) {
+		case 0: result_type = ft; break;
+		case 1: result_type = ft; break;
+		}
 	} else if (is_type_slice(t)) {
 		switch (index) {
 		case 0: result_type = make_type_pointer(a, t->Slice.elem); break;
@@ -2285,6 +2362,8 @@ irValue *ir_emit_conv(irProcedure *proc, irValue *value, Type *t) {
 			ExactValue ev = value->Constant.value;
 			if (is_type_float(dst)) {
 				ev = exact_value_to_float(ev);
+			} else if (is_type_complex(dst)) {
+				ev = exact_value_to_complex(ev);
 			} else if (is_type_string(dst)) {
 				// Handled elsewhere
 				GB_ASSERT(ev.kind == ExactValue_String);
@@ -2350,6 +2429,16 @@ irValue *ir_emit_conv(irProcedure *proc, irValue *value, Type *t) {
 		return ir_emit(proc, ir_instr_conv(proc, kind, value, src, dst));
 	}
 
+	if (is_type_complex(src) && is_type_complex(dst)) {
+		Type *ft = base_complex_elem_type(dst);
+		irValue *gen = ir_add_local_generated(proc, dst);
+		irValue *real = ir_emit_conv(proc, ir_emit_struct_ev(proc, value, 0), ft);
+		irValue *imag = ir_emit_conv(proc, ir_emit_struct_ev(proc, value, 1), ft);
+		ir_emit_store(proc, ir_emit_struct_ep(proc, gen, 0), real);
+		ir_emit_store(proc, ir_emit_struct_ep(proc, gen, 1), imag);
+		return ir_emit_load(proc, gen);
+	}
+
 	// float <-> integer
 	if (is_type_float(src) && is_type_integer(dst)) {
 		irConvKind kind = irConv_fptosi;
@@ -3704,6 +3793,37 @@ irValue *ir_build_expr(irProcedure *proc, AstNode *expr) {
 					// return ir_emit(proc, ir_instr_vector_shuffle(proc, vector, indices, index_count));
 				} break;
 
+				case BuiltinProc_complex: {
+					ir_emit_comment(proc, str_lit("complex"));
+					irValue *real = ir_build_expr(proc, ce->args.e[0]);
+					irValue *imag = ir_build_expr(proc, ce->args.e[1]);
+					irValue *dst = ir_add_local_generated(proc, tv->type);
+
+					Type *ft = base_complex_elem_type(tv->type);
+					irValue *rp = ir_emit_struct_ep(proc, dst, 0);
+					irValue *ip = ir_emit_struct_ep(proc, dst, 1);
+
+					real = ir_emit_conv(proc, real, ft);
+					imag = ir_emit_conv(proc, imag, ft);
+					ir_emit_store(proc, rp, real);
+					ir_emit_store(proc, ip, imag);
+
+					return ir_emit_load(proc, dst);
+				} break;
+
+				case BuiltinProc_real: {
+					ir_emit_comment(proc, str_lit("real"));
+					irValue *complex = ir_build_expr(proc, ce->args.e[0]);
+					irValue *real = ir_emit_struct_ev(proc, complex, 0);
+					return ir_emit_conv(proc, real, tv->type);
+				} break;
+				case BuiltinProc_imag: {
+					ir_emit_comment(proc, str_lit("imag"));
+					irValue *complex = ir_build_expr(proc, ce->args.e[0]);
+					irValue *imag = ir_emit_struct_ev(proc, complex, 1);
+					return ir_emit_conv(proc, imag, tv->type);
+				} break;
+
 				case BuiltinProc_slice_ptr: {
 					ir_emit_comment(proc, str_lit("slice_ptr"));
 					irValue *ptr = ir_build_expr(proc, ce->args.e[0]);
@@ -6528,8 +6648,6 @@ void ir_gen_tree(irGen *s) {
 					case Basic_u32:
 					case Basic_i64:
 					case Basic_u64:
-					// case Basic_i128:
-					// case Basic_u128:
 					case Basic_int:
 					case Basic_uint: {
 						tag = ir_emit_conv(proc, ti_ptr, t_type_info_integer_ptr);
@@ -6540,16 +6658,23 @@ void ir_gen_tree(irGen *s) {
 						ir_emit_store(proc, ir_emit_struct_ep(proc, tag, 1), is_signed);
 					} break;
 
-					// case Basic_f16:
 					case Basic_f32:
 					case Basic_f64:
-					// case Basic_f128:
 					{
 						tag = ir_emit_conv(proc, ti_ptr, t_type_info_float_ptr);
 						irValue *bits = ir_const_int(a, type_size_of(a, t));
 						ir_emit_store(proc, ir_emit_struct_ep(proc, tag, 0), bits);
 					} break;
 
+					case Basic_complex64:
+					case Basic_complex128:
+					{
+						tag = ir_emit_conv(proc, ti_ptr, t_type_info_complex_ptr);
+						irValue *bits = ir_const_int(a, type_size_of(a, t));
+						ir_emit_store(proc, ir_emit_struct_ep(proc, tag, 0), bits);
+					} break;
+
+
 					case Basic_rawptr:
 						tag = ir_emit_conv(proc, ti_ptr, t_type_info_pointer_ptr);
 						break;
diff --git a/src/ir_print.c b/src/ir_print.c
index beae020db..39486c11f 100644
--- a/src/ir_print.c
+++ b/src/ir_print.c
@@ -154,12 +154,14 @@ void ir_print_type(irFileBuffer *f, irModule *m, Type *t) {
 		case Basic_u32:    ir_fprintf(f, "i32");                     return;
 		case Basic_i64:    ir_fprintf(f, "i64");                     return;
 		case Basic_u64:    ir_fprintf(f, "i64");                     return;
-		// case Basic_i128:   ir_fprintf(f, "i128");                    return;
-		// case Basic_u128:   ir_fprintf(f, "i128");                    return;
-		// case Basic_f16:    ir_fprintf(f, "half");                    return;
+
 		case Basic_f32:    ir_fprintf(f, "float");                   return;
 		case Basic_f64:    ir_fprintf(f, "double");                  return;
-		// case Basic_f128:   ir_fprintf(f, "fp128");                   return;
+
+		case Basic_complex64:  ir_fprintf(f, "%%..complex64");       return;
+		case Basic_complex128: ir_fprintf(f, "%%..complex128");      return;
+
+
 		case Basic_rawptr: ir_fprintf(f, "%%..rawptr");              return;
 		case Basic_string: ir_fprintf(f, "%%..string");              return;
 		case Basic_uint:   ir_fprintf(f, "i%lld", word_bits);        return;
@@ -365,7 +367,7 @@ void ir_print_exact_value(irFileBuffer *f, irModule *m, ExactValue value, Type *
 	} break;
 	case ExactValue_Float: {
 		GB_ASSERT_MSG(is_type_float(type), "%s", type_to_string(type));
-		type = base_type(type);
+		type = core_type(type);
 		u64 u = *cast(u64*)&value.value_float;
 		switch (type->Basic.kind) {
 		case Basic_f32:
@@ -382,28 +384,27 @@ void ir_print_exact_value(irFileBuffer *f, irModule *m, ExactValue value, Type *
 
 		switch (type->Basic.kind) {
 		case 0: break;
-#if 0
-		case Basic_f16:
-			ir_fprintf(f, "bitcast (");
-			ir_print_type(f, m, t_u16);
-			ir_fprintf(f, " %u to ", cast(u16)f32_to_f16(cast(f32)value.value_float));
-			ir_print_type(f, m, t_f16);
-			ir_fprintf(f, ")");
-			break;
-		case Basic_f128:
-			ir_fprintf(f, "bitcast (");
-			ir_fprintf(f, "i128");
-			// TODO(bill): Actually support f128
-			ir_fprintf(f, " %llu to ", u);
-			ir_print_type(f, m, t_f128);
-			ir_fprintf(f, ")");
-			break;
-#endif
 		default:
 			ir_fprintf(f, "0x%016llx", u);
 			break;
 		}
 	} break;
+
+	case ExactValue_Complex: {
+		GB_ASSERT_MSG(is_type_complex(type), "%s", type_to_string(type));
+		type = core_type(type);
+		Type *ft = base_complex_elem_type(type);
+		ir_fprintf(f, " {");
+		ir_print_type(f, m, ft);
+		ir_fprintf(f, " ");
+		ir_print_exact_value(f, m, exact_value_float(value.value_complex.real), ft);
+		ir_fprintf(f, ", ");
+		ir_print_type(f, m, ft);
+		ir_fprintf(f, " ");
+		ir_print_exact_value(f, m, exact_value_float(value.value_complex.imag), ft);
+		ir_fprintf(f, "}");
+	} break;
+
 	case ExactValue_Pointer:
 		if (value.value_pointer == 0) {
 			ir_fprintf(f, "null");
@@ -1415,6 +1416,12 @@ void print_llvm_ir(irGen *ir) {
 	ir_print_encoded_local(f, str_lit("..rawptr"));
 	ir_fprintf(f, " = type i8* ; Basic_rawptr\n");
 
+	ir_print_encoded_local(f, str_lit("..complex64"));
+	ir_fprintf(f, " = type {float, float} ; Basic_complex64\n");
+	ir_print_encoded_local(f, str_lit("..complex128"));
+	ir_fprintf(f, " = type {double, double} ; Basic_complex128\n");
+
+
 	ir_print_encoded_local(f, str_lit("..any"));
 	ir_fprintf(f, " = type {");
 	ir_print_type(f, m, t_type_info_ptr);
diff --git a/src/main.c b/src/main.c
index d44f28b75..118d0e50c 100644
--- a/src/main.c
+++ b/src/main.c
@@ -252,7 +252,7 @@ int main(int argc, char **argv) {
 	i32 exit_code = 0;
 	// For more passes arguments: http://llvm.org/docs/Passes.html
 	exit_code = system_exec_command_line_app("llvm-opt", false,
-		"\"%.*sbin/opt\" \"%s\" -o \"%.*s\".bc "
+		"\"%.*sbin/opt\" \"%s\" -o \"%.*s.bc\" "
 		"-mem2reg "
 		"-memcpyopt "
 		"-die "
diff --git a/src/parser.c b/src/parser.c
index fbedb3855..5169bd7bf 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -1735,6 +1735,7 @@ AstNode *parse_operand(AstFile *f, bool lhs) {
 
 	case Token_Integer:
 	case Token_Float:
+	case Token_Imag:
 	case Token_Rune:
 		operand = ast_basic_lit(f, f->curr_token);
 		next_token(f);
@@ -3238,6 +3239,7 @@ AstNode *parse_stmt(AstFile *f) {
 	case Token_Ident:
 	case Token_Integer:
 	case Token_Float:
+	case Token_Imag:
 	case Token_Rune:
 	case Token_String:
 	case Token_OpenParen:
diff --git a/src/tokenizer.c b/src/tokenizer.c
index 6c7f76c02..bd012519b 100644
--- a/src/tokenizer.c
+++ b/src/tokenizer.c
@@ -7,6 +7,7 @@ TOKEN_KIND(Token__LiteralBegin, "_LiteralBegin"), \
 	TOKEN_KIND(Token_Ident,     "identifier"), \
 	TOKEN_KIND(Token_Integer,   "integer"), \
 	TOKEN_KIND(Token_Float,     "float"), \
+	TOKEN_KIND(Token_Imag,      "imaginary"), \
 	TOKEN_KIND(Token_Rune,      "rune"), \
 	TOKEN_KIND(Token_String,    "string"), \
 TOKEN_KIND(Token__LiteralEnd,   "_LiteralEnd"), \
@@ -547,18 +548,18 @@ Token scan_number_to_token(Tokenizer *t, bool seen_decimal_point) {
 			}
 		}
 
-		token.string.len = t->curr - token.string.text;
-		return token;
+		goto end;
 	}
 
 	scan_mantissa(t, 10);
 
+
 fraction:
 	if (t->curr_rune == '.') {
 		// HACK(bill): This may be inefficient
 		TokenizerState state = save_tokenizer_state(t);
 		advance_to_next_rune(t);
-		if (digit_value(t->curr_rune) >= 10) {
+		if (t->curr_rune == '.') {
 			// TODO(bill): Clean up this shit
 			restore_tokenizer_state(t, &state);
 			goto end;
@@ -577,6 +578,11 @@ exponent:
 		scan_mantissa(t, 10);
 	}
 
+	if (t->curr_rune == 'i') {
+		token.kind = Token_Imag;
+		advance_to_next_rune(t);
+	}
+
 end:
 	token.string.len = t->curr - token.string.text;
 	return token;
diff --git a/src/types.c b/src/types.c
index fe46dc3cd..338489234 100644
--- a/src/types.c
+++ b/src/types.c
@@ -12,25 +12,12 @@ typedef enum BasicKind {
 	Basic_i64,
 	Basic_u64,
 
-/* 	Basic_i16le,
-	Basic_i16be,
-	Basic_u16le,
-	Basic_u16be,
-	Basic_i32le,
-	Basic_i32be,
-	Basic_u32le,
-	Basic_u32be,
-	Basic_i64le,
-	Basic_i64be,
-	Basic_u64le,
-	Basic_u64be, */
-
-	// Basic_i128,
-	// Basic_u128,
-	// Basic_f16,
 	Basic_f32,
 	Basic_f64,
-	// Basic_f128,
+
+	Basic_complex64,
+	Basic_complex128,
+
 	Basic_int,
 	Basic_uint,
 	Basic_rawptr,
@@ -40,6 +27,7 @@ typedef enum BasicKind {
 	Basic_UntypedBool,
 	Basic_UntypedInteger,
 	Basic_UntypedFloat,
+	Basic_UntypedComplex,
 	Basic_UntypedString,
 	Basic_UntypedRune,
 	Basic_UntypedNil,
@@ -55,12 +43,13 @@ typedef enum BasicFlag {
 	BasicFlag_Integer  = GB_BIT(1),
 	BasicFlag_Unsigned = GB_BIT(2),
 	BasicFlag_Float    = GB_BIT(3),
-	BasicFlag_Pointer  = GB_BIT(4),
-	BasicFlag_String   = GB_BIT(5),
-	BasicFlag_Rune     = GB_BIT(6),
-	BasicFlag_Untyped  = GB_BIT(7),
+	BasicFlag_Complex  = GB_BIT(4),
+	BasicFlag_Pointer  = GB_BIT(5),
+	BasicFlag_String   = GB_BIT(6),
+	BasicFlag_Rune     = GB_BIT(7),
+	BasicFlag_Untyped  = GB_BIT(8),
 
-	BasicFlag_Numeric      = BasicFlag_Integer | BasicFlag_Float,
+	BasicFlag_Numeric      = BasicFlag_Integer | BasicFlag_Float | BasicFlag_Complex,
 	BasicFlag_Ordered      = BasicFlag_Numeric | BasicFlag_String  | BasicFlag_Pointer,
 	BasicFlag_ConstantType = BasicFlag_Boolean | BasicFlag_Numeric | BasicFlag_Pointer | BasicFlag_String | BasicFlag_Rune,
 } BasicFlag;
@@ -210,7 +199,9 @@ void selection_add_index(Selection *s, isize index) {
 
 gb_global Type basic_types[] = {
 	{Type_Basic, {Basic_Invalid,        0,                                       0, STR_LIT("invalid type")}},
+
 	{Type_Basic, {Basic_bool,           BasicFlag_Boolean,                       1, STR_LIT("bool")}},
+
 	{Type_Basic, {Basic_i8,             BasicFlag_Integer,                       1, STR_LIT("i8")}},
 	{Type_Basic, {Basic_u8,             BasicFlag_Integer | BasicFlag_Unsigned,  1, STR_LIT("u8")}},
 	{Type_Basic, {Basic_i16,            BasicFlag_Integer,                       2, STR_LIT("i16")}},
@@ -219,20 +210,24 @@ gb_global Type basic_types[] = {
 	{Type_Basic, {Basic_u32,            BasicFlag_Integer | BasicFlag_Unsigned,  4, STR_LIT("u32")}},
 	{Type_Basic, {Basic_i64,            BasicFlag_Integer,                       8, STR_LIT("i64")}},
 	{Type_Basic, {Basic_u64,            BasicFlag_Integer | BasicFlag_Unsigned,  8, STR_LIT("u64")}},
-	// {Type_Basic, {Basic_i128,           BasicFlag_Integer,                      16, STR_LIT("i128")}},
-	// {Type_Basic, {Basic_u128,           BasicFlag_Integer | BasicFlag_Unsigned, 16, STR_LIT("u128")}},
-	// {Type_Basic, {Basic_f16,            BasicFlag_Float,                         2, STR_LIT("f16")}},
+
 	{Type_Basic, {Basic_f32,            BasicFlag_Float,                         4, STR_LIT("f32")}},
 	{Type_Basic, {Basic_f64,            BasicFlag_Float,                         8, STR_LIT("f64")}},
-	// {Type_Basic, {Basic_f128,           BasicFlag_Float,                        16, STR_LIT("f128")}},
+
+	{Type_Basic, {Basic_complex64,      BasicFlag_Complex,                       8, STR_LIT("complex64")}},
+	{Type_Basic, {Basic_complex128,     BasicFlag_Complex,                      16, STR_LIT("complex128")}},
+
 	{Type_Basic, {Basic_int,            BasicFlag_Integer,                      -1, STR_LIT("int")}},
 	{Type_Basic, {Basic_uint,           BasicFlag_Integer | BasicFlag_Unsigned, -1, STR_LIT("uint")}},
+
 	{Type_Basic, {Basic_rawptr,         BasicFlag_Pointer,                      -1, STR_LIT("rawptr")}},
 	{Type_Basic, {Basic_string,         BasicFlag_String,                       -1, STR_LIT("string")}},
 	{Type_Basic, {Basic_any,            0,                                      -1, STR_LIT("any")}},
+
 	{Type_Basic, {Basic_UntypedBool,    BasicFlag_Boolean | BasicFlag_Untyped,   0, STR_LIT("untyped bool")}},
 	{Type_Basic, {Basic_UntypedInteger, BasicFlag_Integer | BasicFlag_Untyped,   0, STR_LIT("untyped integer")}},
 	{Type_Basic, {Basic_UntypedFloat,   BasicFlag_Float   | BasicFlag_Untyped,   0, STR_LIT("untyped float")}},
+	{Type_Basic, {Basic_UntypedComplex, BasicFlag_Complex | BasicFlag_Untyped,   0, STR_LIT("untyped complex")}},
 	{Type_Basic, {Basic_UntypedString,  BasicFlag_String  | BasicFlag_Untyped,   0, STR_LIT("untyped string")}},
 	{Type_Basic, {Basic_UntypedRune,    BasicFlag_Integer | BasicFlag_Untyped,   0, STR_LIT("untyped rune")}},
 	{Type_Basic, {Basic_UntypedNil,     BasicFlag_Untyped,                       0, STR_LIT("untyped nil")}},
@@ -253,20 +248,24 @@ gb_global Type *t_i32             = &basic_types[Basic_i32];
 gb_global Type *t_u32             = &basic_types[Basic_u32];
 gb_global Type *t_i64             = &basic_types[Basic_i64];
 gb_global Type *t_u64             = &basic_types[Basic_u64];
-// gb_global Type *t_i128            = &basic_types[Basic_i128];
-// gb_global Type *t_u128            = &basic_types[Basic_u128];
-// gb_global Type *t_f16             = &basic_types[Basic_f16];
+
 gb_global Type *t_f32             = &basic_types[Basic_f32];
 gb_global Type *t_f64             = &basic_types[Basic_f64];
-// gb_global Type *t_f128            = &basic_types[Basic_f128];
+
+gb_global Type *t_complex64       = &basic_types[Basic_complex64];
+gb_global Type *t_complex128      = &basic_types[Basic_complex128];
+
 gb_global Type *t_int             = &basic_types[Basic_int];
 gb_global Type *t_uint            = &basic_types[Basic_uint];
+
 gb_global Type *t_rawptr          = &basic_types[Basic_rawptr];
 gb_global Type *t_string          = &basic_types[Basic_string];
 gb_global Type *t_any             = &basic_types[Basic_any];
+
 gb_global Type *t_untyped_bool    = &basic_types[Basic_UntypedBool];
 gb_global Type *t_untyped_integer = &basic_types[Basic_UntypedInteger];
 gb_global Type *t_untyped_float   = &basic_types[Basic_UntypedFloat];
+gb_global Type *t_untyped_complex = &basic_types[Basic_UntypedComplex];
 gb_global Type *t_untyped_string  = &basic_types[Basic_UntypedString];
 gb_global Type *t_untyped_rune    = &basic_types[Basic_UntypedRune];
 gb_global Type *t_untyped_nil     = &basic_types[Basic_UntypedNil];
@@ -293,6 +292,7 @@ gb_global Type *t_type_info_enum_value_ptr = NULL;
 gb_global Type *t_type_info_named         = NULL;
 gb_global Type *t_type_info_integer       = NULL;
 gb_global Type *t_type_info_float         = NULL;
+gb_global Type *t_type_info_complex       = NULL;
 gb_global Type *t_type_info_any           = NULL;
 gb_global Type *t_type_info_string        = NULL;
 gb_global Type *t_type_info_boolean       = NULL;
@@ -312,6 +312,7 @@ gb_global Type *t_type_info_map           = NULL;
 gb_global Type *t_type_info_named_ptr         = NULL;
 gb_global Type *t_type_info_integer_ptr       = NULL;
 gb_global Type *t_type_info_float_ptr         = NULL;
+gb_global Type *t_type_info_complex_ptr       = NULL;
 gb_global Type *t_type_info_any_ptr           = NULL;
 gb_global Type *t_type_info_string_ptr        = NULL;
 gb_global Type *t_type_info_boolean_ptr       = NULL;
@@ -615,6 +616,13 @@ bool is_type_float(Type *t) {
 	}
 	return false;
 }
+bool is_type_complex(Type *t) {
+	t = core_type(t);
+	if (t->kind == Type_Basic) {
+		return (t->Basic.flags & BasicFlag_Complex) != 0;
+	}
+	return false;
+}
 bool is_type_f32(Type *t) {
 	t = core_type(t);
 	if (t->kind == Type_Basic) {
@@ -695,6 +703,19 @@ Type *base_vector_type(Type *t) {
 	return t;
 }
 
+Type *base_complex_elem_type(Type *t) {
+	t = core_type(t);
+	if (is_type_complex(t)) {
+		switch (t->Basic.kind) {
+		case Basic_complex64:      return t_f32;
+		case Basic_complex128:     return t_f64;
+		case Basic_UntypedComplex: return t_untyped_float;
+		}
+	}
+	GB_PANIC("Invalid complex type");
+	return t_invalid;
+}
+
 
 bool is_type_struct(Type *t) {
 	t = base_type(t);
@@ -953,6 +974,7 @@ Type *default_type(Type *type) {
 		case Basic_UntypedBool:    return t_bool;
 		case Basic_UntypedInteger: return t_int;
 		case Basic_UntypedFloat:   return t_f64;
+		case Basic_UntypedComplex: return t_complex128;
 		case Basic_UntypedString:  return t_string;
 		case Basic_UntypedRune:    return t_rune;
 		}
@@ -1543,6 +1565,10 @@ i64 type_align_of_internal(gbAllocator allocator, Type *t, TypePath *path) {
 
 		case Basic_int: case Basic_uint: case Basic_rawptr:
 			return build_context.word_size;
+
+		case Basic_complex64: case Basic_complex128:
+			// complex{64,128} align as [2]f{32,64}
+			return type_size_of_internal(allocator, t, path) / 2;
 		}
 	} break;