---

yaml
---
r: 54694
b: refs/heads/snap-stage3
c: 4ad8ec3
h: refs/heads/master
v: v3

Author: crabtw

[refs]

@@ -1,7 +1,7 @@
 ---
 refs/heads/master: 5f13e9ccc2e3328d4cd8ca49f84e6840dd998346
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
-refs/heads/snap-stage3: 65ff441b3d25d83335dc46ed4ef86421fca29c8d
+refs/heads/snap-stage3: 4ad8ec351afba3bb7b037b24a3bee1589a10780a
 refs/heads/try: 8eb2bab100b42f0ba751552d8eff00eb2134c55a
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105
 refs/heads/ndm: f3868061cd7988080c30d6d5bf352a5a5fe2460b

branches/snap-stage3/src/librustc/middle/trans/cabi_x86_64.rs

@@ -256,10 +256,10 @@ fn classify_ty(ty: TypeRef) -> ~[x86_64_reg_class] {
                         cls[i] = sse_int_class;
                     } else if is_sse(cls[i]) {
                         i += 1;
-                        while cls[i] == sseup_class { i += 1u; }
+                        while i != e && cls[i] == sseup_class { i += 1u; }
                     } else if cls[i] == x87_class {
                         i += 1;
-                        while cls[i] == x87up_class { i += 1u; }
+                        while i != e && cls[i] == x87up_class { i += 1u; }
                     } else {
                         i += 1;
                     }

branches/snap-stage3/src/test/run-pass/issue-5754.rs

@@ -0,0 +1,19 @@
+// Copyright 2013 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.
+
+struct S {
+    r: float
+}
+
+extern "C" {
+    fn rust_dbg_extern_identity_double(arg1: S) -> float;
+}
+
+pub fn main() {}