Merge asm implementations

1 files changed, 24 insertions, 0 deletions

diff --git a/src/call_asm.rs b/src/call_asm.rs
new file mode 100644
index 0000000..295277f
--- /dev/null
+++ b/src/call_asm.rs
@@ -0,0 +1,24 @@
+/// An internal macro to invoke an assembly routine.
+///
+/// Depending on whether the unstable `inline-asm` feature is enabled, this will either call into
+/// the inline assembly implementation directly, or through the FFI shim (see `asm/lib.rs`).
+macro_rules! call_asm {
+    ( $func:ident ( $($args:ident: $tys:ty),* ) $(-> $ret:ty)? ) => {{
+        #[allow(unused_unsafe)]
+        unsafe {
+            match () {
+                #[cfg(feature = "inline-asm")]
+                () => crate::asm::inline::$func($($args),*),
+
+                #[cfg(not(feature = "inline-asm"))]
+                () => {
+                    extern "C" {
+                        fn $func($($args: $tys),*) $(-> $ret)?;
+                    }
+
+                    $func($($args),*)
+                },
+            }
+        }
+    }};
+}