fluencelabs/musl
1
0
Fork 0
mirror of https://github.com/fluencelabs/musl synced 2025-06-30 23:21:56 +00:00
Code Issues Projects Releases Wiki Activity

math: clean up inverse trigonometric functions

Browse Source 
modifications:
* avoid unsigned->signed conversions
* removed various volatile hacks
* use FORCE_EVAL when evaluating only for side-effects
* factor out R() rational approximation instead of manual inline
* __invtrigl.h now only provides __invtrigl_R, __pio2_hi and __pio2_lo
* use 2*pio2_hi, 2*pio2_lo instead of pi_hi, pi_lo

otherwise the logic is not changed, long double versions will
need a revisit when a genaral long double cleanup happens
This commit is contained in:
Szabolcs Nagy
2012-12-11 23:56:59 +01:00
parent 482ccd2f74
commit b12a73d5bf
12 changed files with 261 additions and 380 deletions
Download Patch File Download Diff File Expand all files Collapse all files

66
src/math/__invtrigl.h
View File

@ -1,68 +1,10 @@
/* origin: FreeBSD /usr/src/lib/msun/src/ld80/invtrig.h */
/*-
* Copyright (c) 2008 David Schultz <das@FreeBSD.ORG>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "libm.h"
#include <float.h>
#if LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
#define BIAS (LDBL_MAX_EXP - 1)
#define MANH_SIZE LDBL_MANH_SIZE
/* Constants shared by the long double inverse trig functions. */
#define pS0 __pS0
#define pS1 __pS1
#define pS2 __pS2
#define pS3 __pS3
#define pS4 __pS4
#define pS5 __pS5
#define pS6 __pS6
#define qS1 __qS1
#define qS2 __qS2
#define qS3 __qS3
#define qS4 __qS4
#define qS5 __qS5
#define pi_hi __pi_hi
#define pi_lo __pi_lo
/* shared by acosl, asinl and atan2l */
#define pio2_hi __pio2_hi
#define pio2_lo __pio2_lo
extern const long double pio2_hi, pio2_lo;
extern const long double pS0, pS1, pS2, pS3, pS4, pS5, pS6;
extern const long double qS1, qS2, qS3, qS4, qS5;
extern const long double pi_hi, pi_lo, pio2_hi, pio2_lo;
static long double P(long double x)
{
return x * (pS0 + x * (pS1 + x * (pS2 + x * (pS3 +
x * (pS4 + x * (pS5 + x * pS6))))));
}
static long double Q(long double x)
{
return 1.0 + x * (qS1 + x * (qS2 + x * (qS3 + x * (qS4 + x * qS5))));
}
long double __invtrigl_R(long double z);
#endif