Jacek Caban : ntdll: Reimplement _allrem using 32-bit arithmetic.
Alexandre Julliard
julliard at winehq.org
Tue Jun 9 15:27:46 CDT 2020
Module: wine
Branch: master
Commit: 0547da64a3c431ffbc8a9304aaeb1dec3b448612
URL: https://source.winehq.org/git/wine.git/?a=commit;h=0547da64a3c431ffbc8a9304aaeb1dec3b448612
Author: Jacek Caban <jacek at codeweavers.com>
Date: Mon Jun 8 18:12:27 2020 +0200
ntdll: Reimplement _allrem using 32-bit arithmetic.
Based on compiler-rt.
Signed-off-by: Jacek Caban <jacek at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>
---
dlls/ntdll/large_int.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/dlls/ntdll/large_int.c b/dlls/ntdll/large_int.c
index 5f53a3f404..7114b8c2d9 100644
--- a/dlls/ntdll/large_int.c
+++ b/dlls/ntdll/large_int.c
@@ -777,7 +777,13 @@ LONGLONG WINAPI _allmul( LONGLONG a, LONGLONG b )
*/
LONGLONG WINAPI _allrem( LONGLONG a, LONGLONG b )
{
- return a % b;
+ LONGLONG s = b >> 63; /* s = b < 0 ? -1 : 0 */
+ ULONGLONG r;
+ b = (b ^ s) - s; /* negate if s == -1 */
+ s = a >> 63; /* s = a < 0 ? -1 : 0 */
+ a = (a ^ s) - s; /* negate if s == -1 */
+ udivmod(a, b, &r);
+ return ((LONGLONG)r ^ s) - s; /* negate if s == -1 */
}
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