mirror of
https://github.com/reactos/reactos.git
synced 2024-11-11 09:12:27 +00:00
128 lines
3.7 KiB
C
128 lines
3.7 KiB
C
/* Copyright (C) 1995 DJ Delorie, see COPYING.DJ for details */
|
|
|
|
#include <precomp.h>
|
|
#include <float.h>
|
|
|
|
#define X87_CW_IM (1<<0) /* Invalid operation mask */
|
|
#define X87_CW_DM (1<<1) /* Denormal operand mask */
|
|
#define X87_CW_ZM (1<<2) /* Zero divide mask */
|
|
#define X87_CW_OM (1<<3) /* Overflow mask */
|
|
#define X87_CW_UM (1<<4) /* Underflow mask */
|
|
#define X87_CW_PM (1<<5) /* Precision mask */
|
|
|
|
#define X87_CW_PC_MASK (3<<8) /* precision control mask */
|
|
#define X87_CW_PC24 (0<<8) /* 24 bit precision */
|
|
#define X87_CW_PC53 (2<<8) /* 53 bit precision */
|
|
#define X87_CW_PC64 (3<<8) /* 64 bit precision */
|
|
|
|
#define X87_CW_RC_MASK (3<<10) /* rounding control mask */
|
|
#define X87_CW_RC_NEAREST (0<<10) /* round to nearest */
|
|
#define X87_CW_RC_DOWN (1<<10) /* round down */
|
|
#define X87_CW_RC_UP (2<<10) /* round up */
|
|
#define X87_CW_RC_ZERO (3<<10) /* round toward zero (chop) */
|
|
|
|
#define X87_CW_IC (1<<12) /* infinity control flag */
|
|
|
|
/*
|
|
* @implemented
|
|
*/
|
|
|
|
unsigned int CDECL _controlfp(unsigned int newval, unsigned int mask)
|
|
{
|
|
return _control87( newval, mask & ~_EM_DENORMAL );
|
|
}
|
|
|
|
/*********************************************************************
|
|
* _control87 (MSVCRT.@)
|
|
*/
|
|
unsigned int CDECL _control87(unsigned int newval, unsigned int mask)
|
|
{
|
|
unsigned int fpword = 0;
|
|
unsigned int flags = 0;
|
|
|
|
TRACE("(%08x, %08x): Called\n", newval, mask);
|
|
|
|
/* Get fp control word */
|
|
#if defined(__GNUC__)
|
|
__asm__ __volatile__( "fstcw %0" : "=m" (fpword) : );
|
|
#else
|
|
__asm fstcw [fpword];
|
|
#endif
|
|
|
|
TRACE("Control word before : %08x\n", fpword);
|
|
|
|
/* Convert into mask constants */
|
|
if (fpword & 0x1) flags |= _EM_INVALID;
|
|
if (fpword & 0x2) flags |= _EM_DENORMAL;
|
|
if (fpword & 0x4) flags |= _EM_ZERODIVIDE;
|
|
if (fpword & 0x8) flags |= _EM_OVERFLOW;
|
|
if (fpword & 0x10) flags |= _EM_UNDERFLOW;
|
|
if (fpword & 0x20) flags |= _EM_INEXACT;
|
|
switch(fpword & 0xC00) {
|
|
case 0xC00: flags |= _RC_UP|_RC_DOWN; break;
|
|
case 0x800: flags |= _RC_UP; break;
|
|
case 0x400: flags |= _RC_DOWN; break;
|
|
}
|
|
switch(fpword & 0x300) {
|
|
case 0x0: flags |= _PC_24; break;
|
|
case 0x200: flags |= _PC_53; break;
|
|
case 0x300: flags |= _PC_64; break;
|
|
}
|
|
if (fpword & 0x1000) flags |= _IC_AFFINE;
|
|
|
|
/* Mask with parameters */
|
|
flags = (flags & ~mask) | (newval & mask);
|
|
|
|
/* Convert (masked) value back to fp word */
|
|
fpword = 0;
|
|
if (flags & _EM_INVALID) fpword |= 0x1;
|
|
if (flags & _EM_DENORMAL) fpword |= 0x2;
|
|
if (flags & _EM_ZERODIVIDE) fpword |= 0x4;
|
|
if (flags & _EM_OVERFLOW) fpword |= 0x8;
|
|
if (flags & _EM_UNDERFLOW) fpword |= 0x10;
|
|
if (flags & _EM_INEXACT) fpword |= 0x20;
|
|
switch(flags & (_RC_UP | _RC_DOWN)) {
|
|
case _RC_UP|_RC_DOWN: fpword |= 0xC00; break;
|
|
case _RC_UP: fpword |= 0x800; break;
|
|
case _RC_DOWN: fpword |= 0x400; break;
|
|
}
|
|
switch (flags & (_PC_24 | _PC_53)) {
|
|
case _PC_64: fpword |= 0x300; break;
|
|
case _PC_53: fpword |= 0x200; break;
|
|
case _PC_24: fpword |= 0x0; break;
|
|
}
|
|
if (flags & _IC_AFFINE) fpword |= 0x1000;
|
|
|
|
TRACE("Control word after : %08x\n", fpword);
|
|
|
|
/* Put fp control word */
|
|
#if defined(__GNUC__)
|
|
__asm__ __volatile__( "fldcw %0" : : "m" (fpword) );
|
|
#else
|
|
__asm fldcw [fpword];
|
|
#endif
|
|
|
|
return flags;
|
|
}
|
|
|
|
/*********************************************************************
|
|
* _controlfp_s (MSVCRT.@)
|
|
*/
|
|
int CDECL _controlfp_s(unsigned int *cur, unsigned int newval, unsigned int mask)
|
|
{
|
|
#ifdef __i386__
|
|
unsigned int flags;
|
|
|
|
FIXME("(%p %u %u) semi-stub\n", cur, newval, mask);
|
|
|
|
flags = _control87( newval, mask & ~_EM_DENORMAL );
|
|
|
|
if(cur)
|
|
*cur = flags;
|
|
|
|
return 0;
|
|
#else
|
|
FIXME(":Not Implemented!\n");
|
|
return 0;
|
|
#endif
|
|
}
|