_controlfp.c File Reference

#include <precomp.h>
#include "fpscr.h"

Include dependency graph for _controlfp.c:

Go to the source code of this file.

Functions
unsigned int CDECL	_controlfp (unsigned int newval, unsigned int mask)
unsigned int CDECL	_control87 (unsigned int newval, unsigned int mask)
int CDECL	_controlfp_s (unsigned int *cur, unsigned int newval, unsigned int mask)

Function Documentation

_control87()

unsigned int CDECL _control87	(	unsigned int	newval,
		unsigned int	mask
	)

Definition at line 16 of file _controlfp.c.

{
    ARM_FPSCR fpscr;
    unsigned int flags = 0;
 
    TRACE("(%08x, %08x): Called\n", newval, mask);
 
    /* Get fp control word */
    fpscr.raw = __getfp();
 
    TRACE("Control word before : %08x\n", fpscr.raw);
 
    /* Convert into mask constants */
    if (!(fpscr.data.ex_control & ARM_CW_IM)) flags |= _EM_INVALID;
    if (!(fpscr.data.ex_control & ARM_CW_ZM)) flags |= _EM_ZERODIVIDE;
    if (!(fpscr.data.ex_control & ARM_CW_OM)) flags |= _EM_OVERFLOW;
    if (!(fpscr.data.ex_control & ARM_CW_UM)) flags |= _EM_UNDERFLOW;
    if (!(fpscr.data.ex_control & ARM_CW_PM)) flags |= _EM_INEXACT;
    if (!(fpscr.data.ex_control & ARM_CW_DM)) flags |= _EM_DENORMAL;
 
    switch (fpscr.data.rounding_mode)
    {
        case ARM_CW_RC_ZERO: flags |= _RC_UP|_RC_DOWN; break;
        case ARM_CW_RC_UP:   flags |= _RC_UP; break;
        case ARM_CW_RC_DOWN: flags |= _RC_DOWN; break;
    }
 
    /* Mask with parameters */
    flags = (flags & ~mask) | (newval & mask);
 
    /* Convert (masked) value back to fp word */
    fpscr.raw = 0;
    if (!(flags & _EM_INVALID))    fpscr.data.ex_control |= ARM_CW_IM;
    if (!(flags & _EM_ZERODIVIDE)) fpscr.data.ex_control |= ARM_CW_ZM;
    if (!(flags & _EM_OVERFLOW))   fpscr.data.ex_control |= ARM_CW_OM;
    if (!(flags & _EM_UNDERFLOW))  fpscr.data.ex_control |= ARM_CW_UM;
    if (!(flags & _EM_INEXACT))    fpscr.data.ex_control |= ARM_CW_PM;
    if (!(flags & _EM_DENORMAL))   fpscr.data.ex_control |= ARM_CW_DM;
 
    switch (flags & (_RC_UP | _RC_DOWN))
    {
        case _RC_UP|_RC_DOWN: fpscr.data.rounding_mode = ARM_CW_RC_ZERO; break;
        case _RC_UP:          fpscr.data.rounding_mode = ARM_CW_RC_UP; break;
        case _RC_DOWN:        fpscr.data.rounding_mode = ARM_CW_RC_DOWN; break;
        case _RC_NEAR:        fpscr.data.rounding_mode = ARM_CW_RC_NEAREST; break;
    }
 
    TRACE("Control word after  : %08x\n", fpscr.raw);
 
    /* Put fp control word */
    __setfp(fpscr.raw);
 
    return flags;
}

_controlfp()

unsigned int CDECL _controlfp	(	unsigned int	newval,
		unsigned int	mask
	)

Definition at line 11 of file _controlfp.c.

{
    return _control87(newval, mask & ~_EM_DENORMAL);
}

_controlfp_s()

int CDECL _controlfp_s	(	unsigned int *	cur,
		unsigned int	newval,
		unsigned int	mask
	)

Definition at line 71 of file _controlfp.c.

{
    unsigned int val;
 
    if (!MSVCRT_CHECK_PMT( !(newval & mask & ~(_MCW_EM | _MCW_RC | _MCW_DN)) ))
    {
        if (cur) *cur = _controlfp(0, 0);  /* retrieve it anyway */
        return EINVAL;
    }
    val = _controlfp(newval, mask);
    if (cur) *cur = val;
    return 0;
}

Referenced by START_TEST().