mirror of
https://github.com/reactos/reactos.git
synced 2024-10-30 03:27:31 +00:00
112 lines
3 KiB
C
112 lines
3 KiB
C
|
/*
|
||
|
* PROJECT: ReactOS CRT
|
||
|
* LICENSE: MIT (https://spdx.org/licenses/MIT)
|
||
|
* PURPOSE: Implementation of x64 floating point control word helper functions
|
||
|
* COPYRIGHT: Copyright 2022 Timo Kreuzer <timo.kreuzer@reactos.org>
|
||
|
*/
|
||
|
|
||
|
#include <float.h>
|
||
|
#include <xmmintrin.h>
|
||
|
|
||
|
#define _MM_DENORMALS_ARE_ZERO 0x0040
|
||
|
|
||
|
unsigned int _get_native_fpcw(void)
|
||
|
{
|
||
|
return _mm_getcsr();
|
||
|
}
|
||
|
|
||
|
void _set_native_fpcw(unsigned int value)
|
||
|
{
|
||
|
_mm_setcsr(value);
|
||
|
}
|
||
|
|
||
|
unsigned int _fpcw_native_to_abstract(unsigned int native)
|
||
|
{
|
||
|
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;
|
||
|
}
|
||
|
|
||
|
unsigned int _fpcw_abstract_to_native(unsigned int abstract)
|
||
|
{
|
||
|
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;
|
||
|
}
|