From 1b4201f90d4c796c5776c1fb7ef077fb73af7f43 Mon Sep 17 00:00:00 2001
From: Alex Crichton <alex@alexcrichton.com>
Date: Thu, 30 Aug 2018 14:13:15 -0700
Subject: [PATCH] Fix compilation on riscv32

---
 library/compiler-builtins/src/riscv32.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/library/compiler-builtins/src/riscv32.rs b/library/compiler-builtins/src/riscv32.rs
index ebaa354a4b30..9161a11ccecc 100644
--- a/library/compiler-builtins/src/riscv32.rs
+++ b/library/compiler-builtins/src/riscv32.rs
@@ -1,7 +1,8 @@
 intrinsics! {
     // Implementation from gcc
     // https://raw.githubusercontent.com/gcc-mirror/gcc/master/libgcc/config/epiphany/mulsi3.c
-    pub extern "C" fn __mulsi3(mut a: u32, mut b: u32) -> u32 {
+    pub extern "C" fn __mulsi3(a: u32, b: u32) -> u32 {
+        let (mut a, mut b) = (a, b);
         let mut r: usize = 0;
 
         while a > 0 {