From 9a5c5163e11a5d013098a7cc635a5198bd8d5fe7 Mon Sep 17 00:00:00 2001
From: Alex Zolotarev <deathbaba@gmail.com>
Date: Thu, 26 May 2011 01:59:51 +0200
Subject: [PATCH] Fixed Visual Studio float math bug in debug

---
 base/base_tests/math_test.cpp | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/base/base_tests/math_test.cpp b/base/base_tests/math_test.cpp
index 448fdeca58..36ec8c57af 100644
--- a/base/base_tests/math_test.cpp
+++ b/base/base_tests/math_test.cpp
@@ -66,12 +66,17 @@ namespace
 {
 
 // Returns the next representable floating point value without using conversion to integer.
-template <typename FloatT> FloatT NextFloat(FloatT x, int dir = 1)
+template <typename FloatT> FloatT NextFloat(FloatT const x, int dir = 1)
 {
-  FloatT d = numeric_limits<FloatT>::denorm_min();
-  while (x + dir * d == x)
+  FloatT d = dir * numeric_limits<FloatT>::denorm_min();
+  while (true)
+  {
+    FloatT y = x;
+    y += d;
+    if (x != y)
+      return y;
     d *= 2;
-  return x + dir * d;
+  }
 }
 
 template <typename FloatT> void TestMaxULPs()