Add Volatile type.

lib/std/core/mem.c3

@@ -968,3 +968,18 @@ fn void* __memcpy(void* dst, void* src, usz n) @weak @export("memcpy")
 	}
 	return dst;
 }
+
+
+module std::core::mem::volatile { Type };
+
+typedef Volatile @structlike = Type;
+
+macro Type Volatile.get(&self)
+{
+	return @volatile_load(*(Type*)self);
+}
+
+macro Type Volatile.set(&self, Type val)
+{
+	return @volatile_store(*(Type*)self, val);
+}

releasenotes.md

@@ -85,6 +85,7 @@
 - Add `ConditionVariable.wait_until` and `ConditionVariable.wait_for`
 - Added readline_to_stream that takes a stream.
 - Added `Ref` and `RefCounted` experimental functionality.
+- Add `Volatile` generic type.
 
 ## 0.7.3 Change list
 

test/test_suite/stdlib/volatile.c3t

@@ -0,0 +1,24 @@
+// #target: macos-x64
+module test;
+import std;
+fn void main()
+{
+	Volatile{int} y;
+	y.set(20);
+	y.get();
+}
+
+/* #expect: test.ll
+
+define void @test.main() #0 {
+entry:
+  %y = alloca i32, align 4
+  store i32 0, ptr %y, align 4
+  %neq = icmp ne ptr %y, null
+  call void @llvm.assume(i1 %neq)
+  store volatile i32 20, ptr %y, align 4
+  %neq1 = icmp ne ptr %y, null
+  call void @llvm.assume(i1 %neq1)
+  %0 = load volatile i32, ptr %y, align 4
+  ret void
+}