Martin Storsjo : msvcrt: Make the tanh function NAN preserving.
Alexandre Julliard
julliard at winehq.org
Wed Jul 28 15:37:42 CDT 2021
Module: wine
Branch: master
Commit: 07ec052e5423f6bbacc2bac0c5684211cecca04f
URL: https://source.winehq.org/git/wine.git/?a=commit;h=07ec052e5423f6bbacc2bac0c5684211cecca04f
Author: Martin Storsjo <martin at martin.st>
Date: Wed Jul 28 14:42:19 2021 +0200
msvcrt: Make the tanh function NAN preserving.
Signed-off-by: Martin Storsjo <martin at martin.st>
Signed-off-by: Piotr Caban <piotr at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>
---
dlls/msvcrt/math.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/dlls/msvcrt/math.c b/dlls/msvcrt/math.c
index a2b03110cf0..69b807f722c 100644
--- a/dlls/msvcrt/math.c
+++ b/dlls/msvcrt/math.c
@@ -4336,12 +4336,11 @@ double CDECL tan( double x )
double CDECL tanh( double x )
{
UINT64 ui = *(UINT64*)&x;
+ UINT64 sign = ui & 0x8000000000000000ULL;
UINT32 w;
- int sign;
double t;
/* x = |x| */
- sign = ui >> 63;
ui &= (UINT64)-1 / 2;
x = *(double*)&ui;
w = ui >> 32;
@@ -4349,11 +4348,15 @@ double CDECL tanh( double x )
if (w > 0x3fe193ea) {
/* |x| > log(3)/2 ~= 0.5493 or nan */
if (w > 0x40340000) {
+ if (ui > 0x7ff0000000000000ULL) {
+ *(UINT64*)&x = ui | sign | 0x0008000000000000ULL;
#if _MSVCR_VER < 140
- if (isnan(x))
return math_error(_DOMAIN, "tanh", x, 0, x);
+#else
+ return x;
#endif
- /* |x| > 20 or nan */
+ }
+ /* |x| > 20 */
/* note: this branch avoids raising overflow */
fp_barrier(x + 0x1p120f);
t = 1 - 0 / x;
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