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List: wine-devel
Subject: [PATCH v2 3/4] msvcrt: Don't use fegetenv in nearbyint.
From: Piotr Caban <piotr () codeweavers ! com>
Date: 2022-01-31 20:36:33
Message-ID: acb4e3fe-bf56-33fe-7e19-d161827f532c () codeweavers ! com
[Download RAW message or body]
The fegetenv/feupdateenv functions are broken in msvcr120 and are
causing unintentional SSE control word changes.
Signed-off-by: Piotr Caban <piotr@codeweavers.com>
---
dlls/msvcrt/math.c | 22 +++++++++++++++++-----
1 file changed, 17 insertions(+), 5 deletions(-)
["0003-msvcrt-Don-t-use-fegetenv-in-nearbyint.txt" (text/x-patch)]
diff --git a/dlls/msvcrt/math.c b/dlls/msvcrt/math.c
index b12ba3e9585..3907dc9dc94 100644
--- a/dlls/msvcrt/math.c
+++ b/dlls/msvcrt/math.c
@@ -6844,13 +6844,25 @@ double CDECL _yn(int n, double x)
*/
double CDECL nearbyint(double x)
{
- fenv_t env;
+ BOOL update_cw, update_sw;
+ unsigned int cw, sw;
- fegetenv(&env);
- _control87(_MCW_EM, _MCW_EM);
+ _setfp(&cw, 0, &sw, 0);
+ update_cw = !(cw & _EM_INEXACT);
+ update_sw = !(sw & _SW_INEXACT);
+ if (update_cw)
+ {
+ cw |= _EM_INEXACT;
+ _setfp(&cw, _EM_INEXACT, NULL, 0);
+ }
x = rint(x);
- feclearexcept(FE_INEXACT);
- feupdateenv(&env);
+ if (update_cw || update_sw)
+ {
+ sw = 0;
+ cw &= ~_EM_INEXACT;
+ _setfp(update_cw ? &cw : NULL, _EM_INEXACT,
+ update_sw ? &sw : NULL, _SW_INEXACT);
+ }
return x;
}
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