From d8e4142bd442c53b6ddc79ea0dd2d90cf550462e Mon Sep 17 00:00:00 2001
From: James Cowgill <jcowgill@debian.org>
Date: Wed, 24 Jan 2018 11:50:10 +0000
Subject: [PATCH] rustc_trans: clobber $1 (aka $at) on mips

This copies what clang does. There is a long explanation as to why this
is needed in the clang source (tools/clang/lib/Basic/Targets/Mips.h).
---
 src/librustc_trans/asm.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/librustc_trans/asm.rs b/src/librustc_trans/asm.rs
index c7be0c4e67d..751f8148a2a 100644
--- a/src/librustc_trans/asm.rs
+++ b/src/librustc_trans/asm.rs
@@ -59,8 +59,9 @@ pub fn trans_inline_asm<'a, 'tcx>(
     // Default per-arch clobbers
     // Basically what clang does
     let arch_clobbers = match &bx.sess().target.target.arch[..] {
-        "x86" | "x86_64" => vec!["~{dirflag}", "~{fpsr}", "~{flags}"],
-        _                => Vec::new()
+        "x86" | "x86_64"  => vec!["~{dirflag}", "~{fpsr}", "~{flags}"],
+        "mips" | "mips64" => vec!["~{$1}"],
+        _                 => Vec::new()
     };
 
     let all_constraints =