diff --git a/lib/std/target.zig b/lib/std/target.zig
index d15eae7dc..f77f73bce 100644
--- a/lib/std/target.zig
+++ b/lib/std/target.zig
@@ -1750,10 +1750,11 @@ pub const Target = struct {
                 else => false,
             },
             f64 => switch (target.cpu.arch) {
+                .aarch64 => target.isDarwin(),
+
                 .x86_64,
                 .i386,
                 .riscv64,
-                .aarch64,
                 .aarch64_be,
                 .aarch64_32,
                 .s390x,
diff --git a/src/type.zig b/src/type.zig
index 3b1b0dd59..d53158735 100644
--- a/src/type.zig
+++ b/src/type.zig
@@ -6530,6 +6530,11 @@ pub const CType = enum {
                     .long, .ulong => return 32,
                     .longlong, .ulonglong, .longdouble => return 64,
                 },
+                .avr => switch (self) {
+                    .short, .ushort, .int, .uint => return 16,
+                    .long, .ulong, .longdouble => return 32,
+                    .longlong, .ulonglong => return 64,
+                },
                 else => switch (self) {
                     .short, .ushort => return 16,
                     .int, .uint => return 32,
@@ -6568,31 +6573,42 @@ pub const CType = enum {
             .emscripten,
             .plan9,
             .solaris,
-            => switch (self) {
-                .short, .ushort => return 16,
-                .int, .uint => return 32,
-                .long, .ulong => return target.cpu.arch.ptrBitWidth(),
-                .longlong, .ulonglong => return 64,
-                .longdouble => switch (target.cpu.arch) {
-                    .i386, .x86_64 => return 80,
+            .haiku,
+            .ananas,
+            .fuchsia,
+            .minix,
+            => switch (target.cpu.arch) {
+                .avr => switch (self) {
+                    .short, .ushort, .int, .uint => return 16,
+                    .long, .ulong, .longdouble => return 32,
+                    .longlong, .ulonglong => return 64,
+                },
+                else => switch (self) {
+                    .short, .ushort => return 16,
+                    .int, .uint => return 32,
+                    .long, .ulong => return target.cpu.arch.ptrBitWidth(),
+                    .longlong, .ulonglong => return 64,
+                    .longdouble => switch (target.cpu.arch) {
+                        .i386, .x86_64 => return 80,
 
-                    .riscv64,
-                    .aarch64,
-                    .aarch64_be,
-                    .aarch64_32,
-                    .s390x,
-                    .mips64,
-                    .mips64el,
-                    .sparc,
-                    .sparc64,
-                    .sparcel,
-                    .powerpc,
-                    .powerpcle,
-                    .powerpc64,
-                    .powerpc64le,
-                    => return 128,
+                        .riscv64,
+                        .aarch64,
+                        .aarch64_be,
+                        .aarch64_32,
+                        .s390x,
+                        .mips64,
+                        .mips64el,
+                        .sparc,
+                        .sparc64,
+                        .sparcel,
+                        .powerpc,
+                        .powerpcle,
+                        .powerpc64,
+                        .powerpc64le,
+                        => return 128,
 
-                    else => return 64,
+                        else => return 64,
+                    },
                 },
             },
 
@@ -6612,14 +6628,10 @@ pub const CType = enum {
                 },
             },
 
-            .ananas,
             .cloudabi,
-            .fuchsia,
             .kfreebsd,
             .lv2,
             .zos,
-            .haiku,
-            .minix,
             .rtems,
             .nacl,
             .aix,