Stefan Dösinger : d3dx9_36/tests: Make sure NaN and negative NaN have the correct sign bits.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: b97b577e9fde609c7c9644e6f189ef84c3a530b1
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=b97b577e9fde609c7c9644e6f1...

Author: Stefan Dösinger <stefan(a)codeweavers.com>
Date:   Tue Sep 20 22:10:28 2011 +0200

d3dx9_36/tests: Make sure NaN and negative NaN have the correct sign bits.

---

 dlls/d3dx9_36/tests/math.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/dlls/d3dx9_36/tests/math.c b/dlls/d3dx9_36/tests/math.c
index c26a523..fcf0a99 100644
--- a/dlls/d3dx9_36/tests/math.c
+++ b/dlls/d3dx9_36/tests/math.c
@@ -2219,7 +2219,9 @@ static void test_D3DXVec_Array(void)
 static void test_D3DXFloat_Array(void)
 {
     static const float z = 0.0f;
-    float nnan = 0.0f/z;
+    /* Compilers set different sign bits on 0.0 / 0.0, pick the right ones for NaN and -NaN */
+    float tmpnan = 0.0f/z;
+    float nnan = copysignf(1, tmpnan) < 0.0f ? tmpnan : -tmpnan;
     float nan = -nnan;
     unsigned int i;
     void *out = NULL;