Add 'compiler/rustc_codegen_gcc/' from commit 'afae271d5d'

git-subtree-dir: compiler/rustc_codegen_gcc
git-subtree-mainline: ae90dcf020
git-subtree-split: afae271d5d

compiler/rustc_codegen_gcc/tests/run/asm.rs

@@ -0,0 +1,66 @@
+// Compiler:
+//
+// Run-time:
+//   status: 0
+
+#![feature(asm, global_asm)]
+
+global_asm!("
+    .global add_asm
+add_asm:
+     mov rax, rdi
+     add rax, rsi
+     ret"
+);
+
+extern "C" {
+    fn add_asm(a: i64, b: i64) -> i64;
+}
+
+fn main() {
+    unsafe {
+        asm!("nop");
+    }
+
+    let x: u64;
+    unsafe {
+        asm!("mov $5, {}",
+            out(reg) x,
+            options(att_syntax)
+        );
+    }
+    assert_eq!(x, 5);
+
+    let x: u64;
+    let input: u64 = 42;
+    unsafe {
+        asm!("mov {input}, {output}",
+             "add $1, {output}",
+            input = in(reg) input,
+            output = out(reg) x,
+            options(att_syntax)
+        );
+    }
+    assert_eq!(x, 43);
+
+    let x: u64;
+    unsafe {
+        asm!("mov {}, 6",
+            out(reg) x,
+        );
+    }
+    assert_eq!(x, 6);
+
+    let x: u64;
+    let input: u64 = 42;
+    unsafe {
+        asm!("mov {output}, {input}",
+             "add {output}, 1",
+            input = in(reg) input,
+            output = out(reg) x,
+        );
+    }
+    assert_eq!(x, 43);
+
+    assert_eq!(unsafe { add_asm(40, 2) }, 42);
+}