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Re-style fdlibm to conform to jerry guidelines

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* First re-style was done automatically by indent to minimize the
  chance of errors during rewrite.

* Manual changes were applied to non-critical places only (comments
  and spaces):
  * Replaced all tabs with spaces.
  * Fixed tab stops in formulae in function comments.
    (Note: ASCII art for math formulae (especially for super- and
    subscripts) is a terrible idea.)
  * Unified the style of function comments.
  * Moved some in-code comments to their right places, which indent
    couldn't handle.
  * Added spaces to formulae of in-code comments to make them more
    readable.
  * Added braces mandated by jerry style guidelines.
  * Added parentheses to multiline #ifdef.

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu
This commit is contained in:
Akos Kiss
2016-03-17 10:42:00 +01:00
parent b39474c746
commit 8dd5186a0d
19 changed files with 2726 additions and 1887 deletions
Download Patch File Download Diff File Expand all files Collapse all files
third-party/fdlibm/s_atan.c
Vendored
+85 -48
View File
@@ -6,14 +6,14 @@
*
* Developed at SunSoft, a Sun Microsystems, Inc. business.
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*
*/
/* atan(x)
* Method
*
* Method:
* 1. Reduce x to positive by atan(x) = -atan(-x).
* 2. According to the integer k=4t+0.25 chopped, t=x, the argument
* is further reduced to one of the following intervals and the
@@ -34,14 +34,16 @@
#include "fdlibm.h"
static const double atanhi[] = {
static const double atanhi[] =
{
4.63647609000806093515e-01, /* atan(0.5)hi 0x3FDDAC67, 0x0561BB4F */
7.85398163397448278999e-01, /* atan(1.0)hi 0x3FE921FB, 0x54442D18 */
9.82793723247329054082e-01, /* atan(1.5)hi 0x3FEF730B, 0xD281F69B */
1.57079632679489655800e+00, /* atan(inf)hi 0x3FF921FB, 0x54442D18 */
};
static const double atanlo[] = {
static const double atanlo[] =
{
2.26987774529616870924e-17, /* atan(0.5)lo 0x3C7A2B7F, 0x222F65E2 */
3.06161699786838301793e-17, /* atan(1.0)lo 0x3C81A626, 0x33145C07 */
1.39033110312309984516e-17, /* atan(1.5)lo 0x3C700788, 0x7AF0CBBD */
@@ -63,48 +65,83 @@ static const double atanlo[] = {
#define one 1.0
#define huge 1.0e300
double atan(double x)
double
atan (double x)
{
double w,s1,s2,z;
int ix,hx,id;
double w, s1, s2, z;
int ix, hx, id;
hx = __HI(x);
ix = hx&0x7fffffff;
if(ix>=0x44100000) { /* if |x| >= 2^66 */
if(ix>0x7ff00000||
(ix==0x7ff00000&&(__LO(x)!=0)))
return x+x; /* NaN */
if(hx>0) return atanhi[3]+atanlo[3];
else return -atanhi[3]-atanlo[3];
} if (ix < 0x3fdc0000) { /* |x| < 0.4375 */
if (ix < 0x3e200000) { /* |x| < 2^-29 */
if(huge+x>one) return x; /* raise inexact */
}
id = -1;
} else {
x = fabs(x);
if (ix < 0x3ff30000) { /* |x| < 1.1875 */
if (ix < 0x3fe60000) { /* 7/16 <=|x|<11/16 */
id = 0; x = (2.0*x-one)/(2.0+x);
} else { /* 11/16<=|x|< 19/16 */
id = 1; x = (x-one)/(x+one);
}
} else {
if (ix < 0x40038000) { /* |x| < 2.4375 */
id = 2; x = (x-1.5)/(one+1.5*x);
} else { /* 2.4375 <= |x| < 2^66 */
id = 3; x = -1.0/x;
}
}}
/* end of argument reduction */
z = x*x;
w = z*z;
/* break sum from i=0 to 10 aT[i]z**(i+1) into odd and even poly */
s1 = z*(aT0+w*(aT2+w*(aT4+w*(aT6+w*(aT8+w*aT10)))));
s2 = w*(aT1+w*(aT3+w*(aT5+w*(aT7+w*aT9))));
if (id<0) return x - x*(s1+s2);
else {
z = atanhi[id] - ((x*(s1+s2) - atanlo[id]) - x);
return (hx<0)? -z:z;
}
}
hx = __HI (x);
ix = hx & 0x7fffffff;
if (ix >= 0x44100000) /* if |x| >= 2^66 */
{
if (ix > 0x7ff00000 || (ix == 0x7ff00000 && (__LO (x) != 0)))
{
return x + x; /* NaN */
}
if (hx > 0)
{
return atanhi[3] + atanlo[3];
}
else
{
return -atanhi[3] - atanlo[3];
}
}
if (ix < 0x3fdc0000) /* |x| < 0.4375 */
{
if (ix < 0x3e200000) /* |x| < 2^-29 */
{
if (huge + x > one) /* raise inexact */
{
return x;
}
}
id = -1;
}
else
{
x = fabs (x);
if (ix < 0x3ff30000) /* |x| < 1.1875 */
{
if (ix < 0x3fe60000) /* 7/16 <= |x| < 11/16 */
{
id = 0;
x = (2.0 * x - one) / (2.0 + x);
}
else /* 11/16 <= |x| < 19/16 */
{
id = 1;
x = (x - one) / (x + one);
}
}
else
{
if (ix < 0x40038000) /* |x| < 2.4375 */
{
id = 2;
x = (x - 1.5) / (one + 1.5 * x);
}
else /* 2.4375 <= |x| < 2^66 */
{
id = 3;
x = -1.0 / x;
}
}
}
/* end of argument reduction */
z = x * x;
w = z * z;
/* break sum from i=0 to 10 aT[i] z**(i+1) into odd and even poly */
s1 = z * (aT0 + w * (aT2 + w * (aT4 + w * (aT6 + w * (aT8 + w * aT10)))));
s2 = w * (aT1 + w * (aT3 + w * (aT5 + w * (aT7 + w * aT9))));
if (id < 0)
{
return x - x * (s1 + s2);
}
else
{
z = atanhi[id] - ((x * (s1 + s2) - atanlo[id]) - x);
return (hx < 0) ? -z : z;
}
} /* atan */