Alexandre Julliard : ntdll: Copy ceil() implementation from msvcrt.
Alexandre Julliard
julliard at winehq.org
Tue Oct 26 16:19:19 CDT 2021
Module: wine
Branch: master
Commit: fca34420f6348a0344a3eff4f1d882d2b67873f8
URL: https://source.winehq.org/git/wine.git/?a=commit;h=fca34420f6348a0344a3eff4f1d882d2b67873f8
Author: Alexandre Julliard <julliard at winehq.org>
Date: Tue Oct 26 10:33:39 2021 +0200
ntdll: Copy ceil() implementation from msvcrt.
Signed-off-by: Alexandre Julliard <julliard at winehq.org>
---
dlls/ntdll/math.c | 25 +++++++++++++++++++++++--
1 file changed, 23 insertions(+), 2 deletions(-)
diff --git a/dlls/ntdll/math.c b/dlls/ntdll/math.c
index 25477b44d4a..e7f5987a5af 100644
--- a/dlls/ntdll/math.c
+++ b/dlls/ntdll/math.c
@@ -146,10 +146,31 @@ double CDECL atan( double x )
/*********************************************************************
* ceil (NTDLL.@)
+ *
+ * Based on musl: src/math/ceilf.c
*/
-double CDECL ceil( double d )
+double CDECL ceil( double x )
{
- return unix_funcs->ceil( d );
+ union {double f; UINT64 i;} u = {x};
+ int e = (u.i >> 52 & 0x7ff) - 0x3ff;
+ UINT64 m;
+
+ if (e >= 52)
+ return x;
+ if (e >= 0) {
+ m = 0x000fffffffffffffULL >> e;
+ if ((u.i & m) == 0)
+ return x;
+ if (u.i >> 63 == 0)
+ u.i += m;
+ u.i &= ~m;
+ } else {
+ if (u.i >> 63)
+ return -0.0;
+ else if (u.i << 1)
+ return 1.0;
+ }
+ return u.f;
}
/*********************************************************************
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