Auto merge of #33460 - shepmaster:16-bit-pointers, r=Aatch

Support 16-bit pointers as well as i/usize

I'm opening this pull request to get some feedback from the community.

Although Rust doesn't support any platforms with a native 16-bit pointer at the moment, the [AVR-Rust][ar] fork is working towards that goal. Keeping this forked logic up-to-date with the changes in master has been onerous so I'd like to merge these changes so that they get carried along when refactoring happens. I do not believe this should increase the maintenance burden.

This is based on the original work of Dylan McKay (@dylanmckay).

[ar]: https://github.com/avr-rust/rust

1 files changed, 14 insertions, 0 deletions

diff --git a/src/libcoretest/mem.rs b/src/libcoretest/mem.rs
index 5bc08376d25..01bafe49a7a 100644
--- a/src/libcoretest/mem.rs
+++ b/src/libcoretest/mem.rs
@@ -19,6 +19,13 @@ fn size_of_basic() {
 }
 
 #[test]
+#[cfg(target_pointer_width = "16")]
+fn size_of_16() {
+    assert_eq!(size_of::<usize>(), 2);
+    assert_eq!(size_of::<*const usize>(), 2);
+}
+
+#[test]
 #[cfg(target_pointer_width = "32")]
 fn size_of_32() {
     assert_eq!(size_of::<usize>(), 4);
@@ -48,6 +55,13 @@ fn align_of_basic() {
 }
 
 #[test]
+#[cfg(target_pointer_width = "16")]
+fn align_of_16() {
+    assert_eq!(align_of::<usize>(), 2);
+    assert_eq!(align_of::<*const usize>(), 2);
+}
+
+#[test]
 #[cfg(target_pointer_width = "32")]
 fn align_of_32() {
     assert_eq!(align_of::<usize>(), 4);