mirror of
https://github.com/jerryscript-project/jerryscript.git
synced 2025-12-15 16:29:21 +00:00
3ba286f3e1
* Rename modified fdlibm to jerry-libm
* Move third-party/fdlibm to jerry-libm
* Rename original fdlibm.h to jerry-libm-internal.h
* And remove it from the public headers.
* Rename jerry-libm's public header to math.h
* This also makes jerry-core sources include `<math.h>`. Therefore,
should anyone want to use a different libm implementation with
jerry, it becomes possible. (The same way as we provide a minimal
libc with standard headers, but should it be insufficient or
conflicting for someone, it can be replaced.)
* Drop `s_` prefix from jerry-libm sources
* The original fdlibm implementation had various prefixes (e.g., `k_`
for sources of kernel routines, and `w_` for wrapper routines), but
after the specialization of fdlibm to jerry, only `s_` remained.
Since it does not encode anything anymore, it can be dropped.
* Stylistic edits to jerry-libm's CMakeLists
* Align project name with other CMakeLists in the code base
* Move Jerry-LibM under Apache License
* Using the same approach as was used by linux-wireless when ath5k
driver license needed clarification. Solution was proposed by SFLC.
External mail for future reference: http://lwn.net/Articles/247806/
* Tests & checks
* Remove FD from the name of libm unit test-related files
* Make vera++ and cppcheck check jerry-libm
* Targets
* Speculative update of targets to use jerry-libm
JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu
130 lines
2.7 KiB
C
130 lines
2.7 KiB
C
/* Copyright 2016 Samsung Electronics Co., Ltd.
|
|
* Copyright 2016 University of Szeged
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*
|
|
* This file is based on work under the following copyright and permission
|
|
* notice:
|
|
*
|
|
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
|
|
*
|
|
* Developed at SunSoft, a Sun Microsystems, Inc. business.
|
|
* Permission to use, copy, modify, and distribute this
|
|
* software is freely granted, provided that this notice
|
|
* is preserved.
|
|
*
|
|
* @(#)s_floor.c 1.3 95/01/18
|
|
*/
|
|
|
|
#include "jerry-libm-internal.h"
|
|
|
|
/* floor(x)
|
|
* Return x rounded toward -inf to integral value
|
|
*
|
|
* Method:
|
|
* Bit twiddling.
|
|
*
|
|
* Exception:
|
|
* Inexact flag raised if x not equal to floor(x).
|
|
*/
|
|
|
|
#define huge 1.0e300
|
|
|
|
double
|
|
floor (double x)
|
|
{
|
|
int i0, i1, j0;
|
|
unsigned i, j;
|
|
|
|
i0 = __HI (x);
|
|
i1 = __LO (x);
|
|
j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;
|
|
if (j0 < 20)
|
|
{
|
|
if (j0 < 0) /* raise inexact if x != 0 */
|
|
{
|
|
if (huge + x > 0.0) /* return 0 * sign(x) if |x| < 1 */
|
|
{
|
|
if (i0 >= 0)
|
|
{
|
|
i0 = i1 = 0;
|
|
}
|
|
else if (((i0 & 0x7fffffff) | i1) != 0)
|
|
{
|
|
i0 = 0xbff00000;
|
|
i1 = 0;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
i = (0x000fffff) >> j0;
|
|
if (((i0 & i) | i1) == 0) /* x is integral */
|
|
{
|
|
return x;
|
|
}
|
|
if (huge + x > 0.0) /* raise inexact flag */
|
|
{
|
|
if (i0 < 0)
|
|
{
|
|
i0 += (0x00100000) >> j0;
|
|
}
|
|
i0 &= (~i);
|
|
i1 = 0;
|
|
}
|
|
}
|
|
}
|
|
else if (j0 > 51)
|
|
{
|
|
if (j0 == 0x400) /* inf or NaN */
|
|
{
|
|
return x + x;
|
|
}
|
|
else /* x is integral */
|
|
{
|
|
return x;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
i = ((unsigned) (0xffffffff)) >> (j0 - 20);
|
|
if ((i1 & i) == 0) /* x is integral */
|
|
{
|
|
return x;
|
|
}
|
|
if (huge + x > 0.0) /* raise inexact flag */
|
|
{
|
|
if (i0 < 0)
|
|
{
|
|
if (j0 == 20)
|
|
{
|
|
i0 += 1;
|
|
}
|
|
else
|
|
{
|
|
j = i1 + (1 << (52 - j0));
|
|
if (j < i1) /* got a carry */
|
|
{
|
|
i0 += 1;
|
|
}
|
|
i1 = j;
|
|
}
|
|
}
|
|
i1 &= (~i);
|
|
}
|
|
}
|
|
__HI (x) = i0;
|
|
__LO (x) = i1;
|
|
return x;
|
|
} /* floor */
|