From 939ec878a00803502f2e07347c09fa6736c5f44a Mon Sep 17 00:00:00 2001
From: LemonBoy <thatlemon@gmail.com>
Date: Mon, 6 May 2019 21:41:08 +0200
Subject: [PATCH] Fix edge case in addXf3

The operands may be zero, use the wrapping operators and avoid a
spurious integer-overflow error.
---
 std/special/compiler_rt/addXf3.zig | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/std/special/compiler_rt/addXf3.zig b/std/special/compiler_rt/addXf3.zig
index 3a70461eca..5852f3e50d 100644
--- a/std/special/compiler_rt/addXf3.zig
+++ b/std/special/compiler_rt/addXf3.zig
@@ -78,8 +78,8 @@ fn addXf3(comptime T: type, a: T, b: T) T {
     const infRep = @bitCast(Z, std.math.inf(T));
 
     // Detect if a or b is zero, infinity, or NaN.
-    if (aAbs - Z(1) >= infRep - Z(1) or
-        bAbs - Z(1) >= infRep - Z(1))
+    if (aAbs -% Z(1) >= infRep - Z(1) or
+        bAbs -% Z(1) >= infRep - Z(1))
     {
         // NaN + anything = qNaN
         if (aAbs > infRep) return @bitCast(T, @bitCast(Z, a) | quietBit);