_control87.c File Reference

#include <xmmintrin.h>
#include <float.h>

Include dependency graph for _control87.c:

Go to the source code of this file.

Functions
unsigned int	_get_native_fpcw (void)
void	_set_native_fpcw (unsigned int value)
unsigned int	_fpcw_native_to_abstract (unsigned int native)
unsigned int	_fpcw_abstract_to_native (unsigned int abstract)
unsigned int __cdecl	_control87 (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 _control87.c.

{
    unsigned int native, oldval, updated;
 
    /* Sanatize the mask */
    mask &= _MCW_DN | _MCW_EM | _MCW_RC;
 
    /* Get native control word */
    native = _get_native_fpcw();
 
    /* Convert to abstract */
    oldval = _fpcw_native_to_abstract(native);
 
    /* Update it according to the given parameters */
    updated = (oldval & ~mask) | (newval & mask);
 
    /* Convert back to native */
    native = _fpcw_abstract_to_native(updated);
 
    /* Set the native value */
    _set_native_fpcw(native);
 
    return updated;
}

_fpcw_abstract_to_native()

unsigned int _fpcw_abstract_to_native

(

unsigned int

abstract

)

Definition at line 69 of file machfpcw.c.

{
    unsigned int rounding_mask, native = 0;
 
    /* Handle exception mask */
    if (abstract & _EM_INVALID)
        native |= _MM_MASK_INVALID;
    if (abstract & _EM_DENORMAL)
        native |= _MM_MASK_DENORM;
    if (abstract & _EM_ZERODIVIDE)
        native |= _MM_MASK_DIV_ZERO;
    if (abstract & _EM_OVERFLOW)
        native |= _MM_MASK_OVERFLOW;
    if (abstract & _EM_UNDERFLOW)
        native |= _MM_MASK_UNDERFLOW;
    if (abstract & _EM_INEXACT)
        native |= _MM_MASK_INEXACT;
 
    /* Handle rounding mode */
    rounding_mask = (abstract & _MCW_RC);
    if (rounding_mask == _RC_DOWN)
        native |= _MM_ROUND_DOWN;
    else if (rounding_mask == _RC_UP)
        native |= _MM_ROUND_UP;
    else if (rounding_mask == _RC_CHOP)
        native |= _MM_ROUND_TOWARD_ZERO;
 
    /* Handle Denormal Control */
    if ((abstract & _MCW_DN) == _DN_FLUSH)
    {
        native |= _MM_DENORMALS_ARE_ZERO | _MM_FLUSH_ZERO_MASK;
    }
    else if ((abstract & _MCW_DN) == _DN_FLUSH_OPERANDS_SAVE_RESULTS)
    {
        native |= _MM_DENORMALS_ARE_ZERO;
    }
    else if ((abstract & _MCW_DN) == _DN_SAVE_OPERANDS_FLUSH_RESULTS)
    {
        native |= _MM_FLUSH_ZERO_MASK;
    }
 
    return native;
}

Referenced by _control87().

_fpcw_native_to_abstract()

unsigned int _fpcw_native_to_abstract

(

unsigned int

native

)

Definition at line 23 of file machfpcw.c.

{
    unsigned int rounding_mask, abstract = 0;
 
    /* Handle exception mask */
    if (native & _MM_MASK_INVALID)
        abstract |= _EM_INVALID;
    if (native & _MM_MASK_DENORM)
        abstract |= _EM_DENORMAL;
    if (native & _MM_MASK_DIV_ZERO)
        abstract |= _EM_ZERODIVIDE;
    if (native & _MM_MASK_OVERFLOW)
        abstract |= _EM_OVERFLOW;
    if (native & _MM_MASK_UNDERFLOW)
        abstract |= _EM_UNDERFLOW;
    if (native & _MM_MASK_INEXACT)
        abstract |= _EM_INEXACT;
 
    /* Handle rounding mode */
    rounding_mask = (native & _MM_ROUND_MASK);
    if (rounding_mask == _MM_ROUND_DOWN)
        abstract |= _RC_DOWN;
    else if(rounding_mask == _MM_ROUND_UP)
        abstract |= _RC_UP;
    else if (rounding_mask == _MM_ROUND_TOWARD_ZERO)
        abstract |= _RC_CHOP;
 
    /* Handle denormal control */
    if (native & _MM_DENORMALS_ARE_ZERO)
    {
        if (native & _MM_FLUSH_ZERO_MASK)
            abstract |= _DN_FLUSH;
        else
            abstract |= _DN_FLUSH_OPERANDS_SAVE_RESULTS;
    }
    else
    {
        if (native & _MM_FLUSH_ZERO_MASK)
            abstract |= _DN_SAVE_OPERANDS_FLUSH_RESULTS;
        else
            abstract |= _DN_SAVE;
    }
 
    return abstract;
}

Referenced by _control87().

_get_native_fpcw()

unsigned int _get_native_fpcw

(

void

)

Definition at line 13 of file machfpcw.c.

{
    return _mm_getcsr();
}

Referenced by _control87().

_set_native_fpcw()

void _set_native_fpcw

(

unsigned int

value

)

Definition at line 18 of file machfpcw.c.

{
    _mm_setcsr(value);
}

Referenced by _control87().