gccrs: Provide input operand for gccrs

gcc/rust/ChangeLog:

	* backend/rust-compile-asm.cc (CompileAsm::asm_construct_inputs):
	Provide input operand for gccrs
	* expand/rust-macro-builtins-asm.cc (parse_reg_operand_in):
	Move expr to In
	(expand_inline_asm_strings):
	Add comments to debug strings

gcc/testsuite/ChangeLog:

	* rust/compile/inline_asm_parse_operand.rs:
	Remove inout, functionality not supported. Remove redundant {}
	* rust/execute/torture/inline_asm_mov_x_5_ARM.rs: Add operand in
	* rust/execute/torture/inline_asm_mov_x_5_x86_64.rs: Likewise

2 files changed, 28 insertions, 5 deletions

diff --git a/gcc/testsuite/rust/execute/torture/inline_asm_mov_x_5_ARM.rs b/gcc/testsuite/rust/execute/torture/inline_asm_mov_x_5_ARM.rs
index 4e76260..0c867df 100644
--- a/gcc/testsuite/rust/execute/torture/inline_asm_mov_x_5_ARM.rs
+++ b/gcc/testsuite/rust/execute/torture/inline_asm_mov_x_5_ARM.rs
@@ -1,5 +1,5 @@
 /* { dg-do run { target arm*-*-* } } */
-/* { dg-output "5\r*\n" }*/
+/* { dg-output "5\r*\n9\r*\n" }*/
 
 #![feature(rustc_attrs)]
 #[rustc_builtin_macro]
@@ -13,12 +13,24 @@ extern "C" {
 
 fn main() -> i32 {
     let mut _x: i32 = 0;
+    let mut _y: i32 = 9;
+
     unsafe {
         asm!(
             "mov {}, 5",
             out(reg) _x
         );
         printf("%d\n\0" as *const str as *const i8, _x);
+    };
+
+    unsafe {
+        asm!(
+            "mov {}, {}",
+            in(reg) _y,
+            out(reg) _x
+        );
+        printf("%d\n\0" as *const str as *const i8, _x);
     }
+
     0
 }
diff --git a/gcc/testsuite/rust/execute/torture/inline_asm_mov_x_5_x86_64.rs b/gcc/testsuite/rust/execute/torture/inline_asm_mov_x_5_x86_64.rs
index c6086e0..5fbbb68 100644
--- a/gcc/testsuite/rust/execute/torture/inline_asm_mov_x_5_x86_64.rs
+++ b/gcc/testsuite/rust/execute/torture/inline_asm_mov_x_5_x86_64.rs
@@ -1,5 +1,5 @@
 /* { dg-do run { target x86_64*-*-* } } */
-/* { dg-output "5\r*\n" }*/
+/* { dg-output "5\r*\n9\r*\n" }*/
 
 #![feature(rustc_attrs)]
 #[rustc_builtin_macro]
@@ -12,13 +12,24 @@ extern "C" {
 }
 
 fn main() -> i32 {
-    let mut _x: i32 = 0;
+    let mut x: i32 = 0;
+    let mut _y: i32 = 9; // Mark it as _y since it is only used as input operand, not printing
+
     unsafe {
         asm!(
             "mov $5, {}",
-            out(reg) _x
+            out(reg) x
+        );
+        printf("%d\n\0" as *const str as *const i8, x);
+    };
+
+    unsafe {
+        asm!(
+            "mov {}, {}",
+            in(reg) _y,
+            out(reg) x,
         );
-        printf("%d\n\0" as *const str as *const i8, _x);
+        printf("%d\n\0" as *const str as *const i8, x);
     }
     0
 }