From 1805e5fb487fb3d1e6b8dc71b3983ac91b62c511 Mon Sep 17 00:00:00 2001
From: Amanieu d'Antras <amanieu@gmail.com>
Date: Tue, 3 Nov 2015 15:19:46 +0000
Subject: [PATCH 1/2] Allow indirect operands to be used as inputs for inline
 asm

---
 src/libsyntax/ext/asm.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/libsyntax/ext/asm.rs b/src/libsyntax/ext/asm.rs
index 984e73f85f610..bdfbb7a49330e 100644
--- a/src/libsyntax/ext/asm.rs
+++ b/src/libsyntax/ext/asm.rs
@@ -139,9 +139,9 @@ pub fn expand_asm<'cx>(cx: &'cx mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
 
                     let (constraint, _str_style) = panictry!(p.parse_str());
 
-                    if constraint.starts_with("=") {
+                    if constraint.starts_with("=") && !constraint.contains("*") {
                         cx.span_err(p.last_span, "input operand constraint contains '='");
-                    } else if constraint.starts_with("+") {
+                    } else if constraint.starts_with("+") && !constraint.contains("*") {
                         cx.span_err(p.last_span, "input operand constraint contains '+'");
                     }
 

From 59c5191c211711c8f51daa4911b1b734393a4011 Mon Sep 17 00:00:00 2001
From: Amanieu d'Antras <amanieu@gmail.com>
Date: Tue, 3 Nov 2015 18:13:03 +0000
Subject: [PATCH 2/2] Add test for inline asm indirect memory operands

---
 src/test/run-pass/asm-indirect-memory.rs | 39 ++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 src/test/run-pass/asm-indirect-memory.rs

diff --git a/src/test/run-pass/asm-indirect-memory.rs b/src/test/run-pass/asm-indirect-memory.rs
new file mode 100644
index 0000000000000..80fd548dfe354
--- /dev/null
+++ b/src/test/run-pass/asm-indirect-memory.rs
@@ -0,0 +1,39 @@
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![feature(asm)]
+
+#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
+fn read(ptr: &u32) -> u32 {
+    let out: u32;
+    unsafe {
+        asm!("mov $1, $0" : "=r" (out) : "*m" (ptr));
+    }
+    out
+}
+
+#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
+fn write(ptr: &mut u32, val: u32) {
+    unsafe {
+        asm!("mov $1, $0" :: "=*m" (ptr), "r" (val));
+    }
+}
+
+#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
+pub fn main() {
+    let a = 1;
+    let mut b = 2;
+    assert_eq!(read(&a), 1);
+    write(&mut b, 3);
+    assert_eq!(b, 3);
+}
+
+#[cfg(not(any(target_arch = "x86", target_arch = "x86_64")))]
+pub fn main() {}