msvcrt: Reimplement _finite().

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

msvcrt: Reimplement _finite().
9f088d01 · Alexandre Julliard · fd51f229 · 9f088d01
Commit 9f088d01 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
@@ -235,7 +235,8 @@ int CDECL MSVCRT__fpclassf( float num )
 */
 int CDECL MSVCRT__finitef( float num )
 {
-    return finitef(num) != 0; /* See comment for _isnan() */
+    union { float f; UINT32 i; } u = { num };
+    return (u.i & 0x7fffffff) < 0x7f800000;
 }

 /*********************************************************************
@@ -2138,7 +2139,8 @@ double CDECL MSVCRT__copysign(double num, double sign)
 */
 int CDECL MSVCRT__finite(double num)
 {
-  return isfinite(num) != 0; /* See comment for _isnan() */
+    union { double f; UINT64 i; } u = { num };
+    return (u.i & ~0ull >> 1) < 0x7ffull << 52;
 }

 /*********************************************************************