msvcrt: Reimplement _chgsign().

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

msvcrt: Reimplement _chgsign().
dbda71f7 · Alexandre Julliard · 4619140b · dbda71f7
Commit dbda71f7 authored Nov 16, 2020 by Alexandre Julliard
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Showing with 6 additions and 4 deletions

math.c dlls/msvcrt/math.c +6 -4

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--- a/dlls/msvcrt/math.c
+++ b/dlls/msvcrt/math.c
@@ -170,8 +170,9 @@ int CDECL MSVCRT__set_FMA3_enable(int flag)
 */
 float CDECL MSVCRT__chgsignf( float num )
 {
-    /* FIXME: +-infinity,Nan not tested */
+    union { float f; UINT32 i; } u = { num };
-    return -num;
+    u.i ^= 0x80000000;
+    return u.f;
 }
 /*********************************************************************
@@ -1786,8 +1787,9 @@ double CDECL MSVCRT__cabs(struct MSVCRT__complex num)
 */
 double CDECL MSVCRT__chgsign(double num)
 {
-  /* FIXME: +-infinity,Nan not tested */
+    union { double f; UINT64 i; } u = { num };
-  return -num;
+    u.i ^= 1ull << 63;
+    return u.f;
 }
 /*********************************************************************