Alexandre Julliard : msvcrt: Reimplement _dsign().

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 4619140b1c3fa4f5e5f9ed1439400d0abe115073
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=4619140b1c3fa4f5e5f9ed1439400d0abe115073

Author: Alexandre Julliard <julliard at winehq.org>
Date:   Mon Nov 16 12:21:16 2020 +0100

msvcrt: Reimplement _dsign().

Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 dlls/msvcrt/math.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/dlls/msvcrt/math.c b/dlls/msvcrt/math.c
index 4b33630b438..6ed8a50330d 100644
--- a/dlls/msvcrt/math.c
+++ b/dlls/msvcrt/math.c
@@ -3873,7 +3873,8 @@ double CDECL MSVCR120_fdim(double x, double y)
  */
 int CDECL MSVCR120__fdsign(float x)
 {
-    return signbit(x) ? 0x8000 : 0;
+    union { float f; UINT32 i; } u = { x };
+    return (u.i >> 16) & 0x8000;
 }
 
 /*********************************************************************
@@ -3881,7 +3882,8 @@ int CDECL MSVCR120__fdsign(float x)
  */
 int CDECL MSVCR120__dsign(double x)
 {
-    return signbit(x) ? 0x8000 : 0;
+    union { double f; UINT64 i; } u = { x };
+    return (u.i >> 48) & 0x8000;
 }