msvcrt: Reimplement _dsign().

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

msvcrt: Reimplement _dsign().
4619140b · Alexandre Julliard · d6476e00 · 4619140b
Commit 4619140b authored Nov 16, 2020 by Alexandre Julliard
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Showing with 4 additions and 2 deletions

math.c dlls/msvcrt/math.c +4 -2

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--- 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;
 }