From f00adb47f5c2b70496dac1c48f03236271b9bd57 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Sat, 6 Apr 2019 01:03:30 -0400
Subject: ir: avoid dependency on isnan

there's a simple way to check for nan that does not need this header.
hryx on IRC reported that Linux Mint based on ubuntu 16.04, kernel
4.15.0, x86_64 did not have the isnan function.
---
 src/ir.cpp | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

(limited to 'src/ir.cpp')

diff --git a/src/ir.cpp b/src/ir.cpp
index 1e9cc5d18c..b602df29ad 100644
--- a/src/ir.cpp
+++ b/src/ir.cpp
@@ -17,7 +17,6 @@
 #include "util.hpp"
 
 #include <errno.h>
-#include <math.h>
 
 struct IrExecContext {
     ZigList<ConstExprValue *> mem_slot_list;
@@ -8251,9 +8250,9 @@ static bool float_is_nan(ConstExprValue *op) {
             case 16:
                 return f16_isSignalingNaN(op->data.x_f16);
             case 32:
-                return isnan(op->data.x_f32);
+                return op->data.x_f32 != op->data.x_f32;
             case 64:
-                return isnan(op->data.x_f64);
+                return op->data.x_f64 != op->data.x_f64;
             case 128:
                 return f128M_isSignalingNaN(&op->data.x_f128);
             default:
-- 
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