Leaked source code of windows server 2003
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/***
* fp10.c - Set default FP precision to 64 bits (10-byte 'long double')
*
* Copyright (c) 1993-2001, Microsoft Corporation. All rights reserved.
*
*Purpose:
*
*Revision History:
* 03-23-93 JWM created file
*
*******************************************************************************/
#include <float.h>
void _setdefaultprecision(void);
/*
* Routine to set default FP precision to 64 bits, used to override
* standard 53-bit precision version in fpinit.c.
*/
void _setdefaultprecision()
{
_controlfp(_PC_64, _MCW_PC);
}