mirror of
https://github.com/reactos/reactos.git
synced 2024-10-31 20:02:55 +00:00
248 lines
7.5 KiB
C
248 lines
7.5 KiB
C
|
|
/*******************************************************************************
|
|
MIT License
|
|
-----------
|
|
|
|
Copyright (c) 2002-2019 Advanced Micro Devices, Inc.
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
of this Software and associated documentaon files (the "Software"), to deal
|
|
in the Software without restriction, including without limitation the rights
|
|
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
copies of the Software, and to permit persons to whom the Software is
|
|
furnished to do so, subject to the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be included in
|
|
all copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
THE SOFTWARE.
|
|
*******************************************************************************/
|
|
|
|
#include "libm.h"
|
|
#include "libm_util.h"
|
|
|
|
#define USE_NANF_WITH_FLAGS
|
|
#define USE_SCALEDOUBLE_1
|
|
#define USE_GET_FPSW_INLINE
|
|
#define USE_SET_FPSW_INLINE
|
|
#define USE_HANDLE_ERRORF
|
|
#include "libm_inlines.h"
|
|
#undef USE_NANF_WITH_FLAGS
|
|
#undef USE_SCALEDOUBLE_1
|
|
#undef USE_GET_FPSW_INLINE
|
|
#undef USE_SET_FPSW_INLINE
|
|
#undef USE_HANDLE_ERRORF
|
|
|
|
#if !defined(_CRTBLD_C9X)
|
|
#define _CRTBLD_C9X
|
|
#endif
|
|
|
|
#include "libm_errno.h"
|
|
|
|
// Disable "C4163: not available as intrinsic function" warning that older
|
|
// compilers may issue here.
|
|
#pragma warning(disable:4163)
|
|
#pragma function(remainderf,fmodf)
|
|
|
|
|
|
#undef _FUNCNAME
|
|
#if defined(COMPILING_FMOD)
|
|
float fmodf(float x, float y)
|
|
#define _FUNCNAME "fmodf"
|
|
#define _OPERATION OP_FMOD
|
|
#else
|
|
float remainderf(float x, float y)
|
|
#define _FUNCNAME "remainderf"
|
|
#define _OPERATION OP_REM
|
|
#endif
|
|
{
|
|
double dx, dy, scale, w, t;
|
|
int i, ntimes, xexp, yexp;
|
|
unsigned long ux, uy, ax, ay;
|
|
|
|
unsigned int sw;
|
|
|
|
dx = x;
|
|
dy = y;
|
|
|
|
|
|
GET_BITS_DP64(dx, ux);
|
|
GET_BITS_DP64(dy, uy);
|
|
ax = ux & ~SIGNBIT_DP64;
|
|
ay = uy & ~SIGNBIT_DP64;
|
|
xexp = (int)((ux & EXPBITS_DP64) >> EXPSHIFTBITS_DP64);
|
|
yexp = (int)((uy & EXPBITS_DP64) >> EXPSHIFTBITS_DP64);
|
|
|
|
if (xexp < 1 || xexp > BIASEDEMAX_DP64 ||
|
|
yexp < 1 || yexp > BIASEDEMAX_DP64)
|
|
{
|
|
/* x or y is zero, NaN or infinity (neither x nor y can be
|
|
denormalized because we promoted from float to double) */
|
|
if (xexp > BIASEDEMAX_DP64)
|
|
{
|
|
/* x is NaN or infinity */
|
|
if (ux & MANTBITS_DP64)
|
|
{
|
|
/* x is NaN */
|
|
unsigned int ufx;
|
|
GET_BITS_SP32(x, ufx);
|
|
return _handle_errorf(_FUNCNAME, _OPERATION, ufx|0x00400000, _DOMAIN, 0,
|
|
EDOM, x, y, 2);
|
|
}
|
|
else
|
|
{
|
|
/* x is infinity; result is NaN */
|
|
return _handle_errorf(_FUNCNAME, _OPERATION, INDEFBITPATT_SP32, _DOMAIN,
|
|
AMD_F_INVALID, EDOM, x, y, 2);
|
|
}
|
|
}
|
|
else if (yexp > BIASEDEMAX_DP64)
|
|
{
|
|
/* y is NaN or infinity */
|
|
if (uy & MANTBITS_DP64)
|
|
{
|
|
/* y is NaN */
|
|
unsigned int ufy;
|
|
GET_BITS_SP32(y, ufy);
|
|
return _handle_errorf(_FUNCNAME, _OPERATION, ufy|0x00400000, _DOMAIN, 0,
|
|
EDOM, x, y, 2);
|
|
}
|
|
else
|
|
{
|
|
#ifdef _CRTBLD_C9X
|
|
/* C99 return for y = +-inf is x */
|
|
return x;
|
|
#else
|
|
/* y is infinity; result is indefinite */
|
|
return _handle_errorf(_FUNCNAME, _OPERATION, INDEFBITPATT_SP32, _DOMAIN,
|
|
AMD_F_INVALID, EDOM, x, y, 2);
|
|
#endif
|
|
}
|
|
}
|
|
else if (xexp < 1)
|
|
{
|
|
/* x must be zero (cannot be denormalized) */
|
|
if (yexp < 1)
|
|
{
|
|
/* y must be zero (cannot be denormalized) */
|
|
return _handle_errorf(_FUNCNAME, _OPERATION, INDEFBITPATT_SP32, _DOMAIN,
|
|
AMD_F_INVALID, EDOM, x, y, 2);
|
|
}
|
|
else
|
|
/* C99 return for x = 0 must preserve sign */
|
|
return x;
|
|
}
|
|
else
|
|
{
|
|
/* y must be zero */
|
|
return _handle_errorf(_FUNCNAME, _OPERATION, INDEFBITPATT_SP32, _DOMAIN,
|
|
AMD_F_INVALID, EDOM, x, y, 2);
|
|
}
|
|
}
|
|
else if (ax == ay)
|
|
{
|
|
/* abs(x) == abs(y); return zero with the sign of x */
|
|
PUT_BITS_DP64(ux & SIGNBIT_DP64, dx);
|
|
return (float)dx;
|
|
}
|
|
|
|
/* Set dx = abs(x), dy = abs(y) */
|
|
PUT_BITS_DP64(ax, dx);
|
|
PUT_BITS_DP64(ay, dy);
|
|
|
|
if (ax < ay)
|
|
{
|
|
/* abs(x) < abs(y) */
|
|
#if !defined(COMPILING_FMOD)
|
|
if (dx > 0.5*dy)
|
|
dx -= dy;
|
|
#endif
|
|
return (float)(x < 0.0? -dx : dx);
|
|
}
|
|
|
|
/* Save the current floating-point status word. We need
|
|
to do this because the remainder function is always
|
|
exact for finite arguments, but our algorithm causes
|
|
the inexact flag to be raised. We therefore need to
|
|
restore the entry status before exiting. */
|
|
sw = get_fpsw_inline();
|
|
|
|
/* Set ntimes to the number of times we need to do a
|
|
partial remainder. If the exponent of x is an exact multiple
|
|
of 24 larger than the exponent of y, and the mantissa of x is
|
|
less than the mantissa of y, ntimes will be one too large
|
|
but it doesn't matter - it just means that we'll go round
|
|
the loop below one extra time. */
|
|
if (xexp <= yexp)
|
|
{
|
|
ntimes = 0;
|
|
w = dy;
|
|
scale = 1.0;
|
|
}
|
|
else
|
|
{
|
|
ntimes = (xexp - yexp) / 24;
|
|
|
|
/* Set w = y * 2^(24*ntimes) */
|
|
PUT_BITS_DP64((unsigned long)(ntimes * 24 + EXPBIAS_DP64) << EXPSHIFTBITS_DP64,
|
|
scale);
|
|
w = scale * dy;
|
|
/* Set scale = 2^(-24) */
|
|
PUT_BITS_DP64((unsigned long)(-24 + EXPBIAS_DP64) << EXPSHIFTBITS_DP64,
|
|
scale);
|
|
}
|
|
|
|
|
|
/* Each time round the loop we compute a partial remainder.
|
|
This is done by subtracting a large multiple of w
|
|
from x each time, where w is a scaled up version of y.
|
|
The subtraction can be performed exactly when performed
|
|
in double precision, and the result at each stage can
|
|
fit exactly in a single precision number. */
|
|
for (i = 0; i < ntimes; i++)
|
|
{
|
|
/* t is the integer multiple of w that we will subtract.
|
|
We use a truncated value for t. */
|
|
t = (double)((int)(dx / w));
|
|
dx -= w * t;
|
|
/* Scale w down by 2^(-24) for the next iteration */
|
|
w *= scale;
|
|
}
|
|
|
|
/* One more time */
|
|
#if defined(COMPILING_FMOD)
|
|
t = (double)((int)(dx / w));
|
|
dx -= w * t;
|
|
#else
|
|
{
|
|
unsigned int todd;
|
|
/* Variable todd says whether the integer t is odd or not */
|
|
t = (double)((int)(dx / w));
|
|
todd = ((int)(dx / w)) & 1;
|
|
dx -= w * t;
|
|
|
|
/* At this point, dx lies in the range [0,dy) */
|
|
/* For the remainder function, we need to adjust dx
|
|
so that it lies in the range (-y/2, y/2] by carefully
|
|
subtracting w (== dy == y) if necessary. */
|
|
if (dx > 0.5 * w || ((dx == 0.5 * w) && todd))
|
|
dx -= w;
|
|
}
|
|
#endif
|
|
|
|
/* **** N.B. for some reason this breaks the 32 bit version
|
|
of remainder when compiling with optimization. */
|
|
/* Restore the entry status flags */
|
|
set_fpsw_inline(sw);
|
|
|
|
/* Set the result sign according to input argument x */
|
|
return (float)(x < 0.0? -dx : dx);
|
|
|
|
}
|