From b99e1267be95e608fb165982a7b77fc0432be360 Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Fri, 12 Oct 2018 09:07:56 +0200
Subject: [PATCH] atomics wrap around on overflow

---
 src/intrinsic.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/intrinsic.rs b/src/intrinsic.rs
index b7338d4d5214..b62838fbc8bb 100644
--- a/src/intrinsic.rs
+++ b/src/intrinsic.rs
@@ -134,7 +134,7 @@ impl<'a, 'mir, 'tcx> EvalContextExt<'tcx> for EvalContext<'a, 'mir, 'tcx, super:
                     "xsub" => mir::BinOp::Sub,
                     _ => bug!(),
                 };
-                // FIXME: what do atomics do on overflow?
+                // Atomics wrap around on overflow.
                 self.binop_ignore_overflow(op, old, rhs, ptr.into())?;
             }