YourWishes/jerryscript
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Re-style fdlibm to conform to jerry guidelines

Browse Source 
* 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_atan2.c
Vendored
+153 -78
View File
@@ -6,31 +6,30 @@
*
* 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.
* ====================================================
*
*/
/* atan2(y,x)
* Method :
* 1. Reduce y to positive by atan2(y,x)=-atan2(-y,x).
* 2. Reduce x to positive by (if x and y are unexceptional):
* ARG (x+iy) = arctan(y/x) ... if x > 0,
* ARG (x+iy) = pi - arctan[y/(-x)] ... if x < 0,
*
* Method:
* 1. Reduce y to positive by atan2(y,x)=-atan2(-y,x).
* 2. Reduce x to positive by (if x and y are unexceptional):
* ARG (x+iy) = arctan(y/x) ... if x > 0,
* ARG (x+iy) = pi - arctan[y/(-x)] ... if x < 0,
*
* Special cases:
*
* ATAN2((anything), NaN ) is NaN;
* ATAN2(NAN , (anything) ) is NaN;
* ATAN2(+-0, +(anything but NaN)) is +-0 ;
* ATAN2(+-0, -(anything but NaN)) is +-pi ;
* ATAN2(+-(anything but 0 and NaN), 0) is +-pi/2;
* ATAN2(+-(anything but INF and NaN), +INF) is +-0 ;
* ATAN2(+-(anything but INF and NaN), -INF) is +-pi;
* ATAN2(+-INF,+INF ) is +-pi/4 ;
* ATAN2(+-INF,-INF ) is +-3pi/4;
* ATAN2(+-INF, (anything but,0,NaN, and INF)) is +-pi/2;
* ATAN2((anything), NaN ) is NaN;
* ATAN2(NAN , (anything) ) is NaN;
* ATAN2(+-0, +(anything but NaN)) is +-0 ;
* ATAN2(+-0, -(anything but NaN)) is +-pi ;
* ATAN2(+-(anything but 0 and NaN), 0) is +-pi/2;
* ATAN2(+-(anything but INF and NaN), +INF) is +-0 ;
* ATAN2(+-(anything but INF and NaN), -INF) is +-pi;
* ATAN2(+-INF,+INF ) is +-pi/4 ;
* ATAN2(+-INF,-INF ) is +-3pi/4;
* ATAN2(+-INF, (anything but,0,NaN, and INF)) is +-pi/2;
*
* Constants:
* The hexadecimal values are the intended ones for the following
@@ -48,66 +47,142 @@
#define pi 3.1415926535897931160E+00 /* 0x400921FB, 0x54442D18 */
#define pi_lo 1.2246467991473531772E-16 /* 0x3CA1A626, 0x33145C07 */
double atan2(double y, double x)
{
double z;
int k,m,hx,hy,ix,iy;
unsigned lx,ly;
double
atan2 (double y, double x)
{
double z;
int k, m, hx, hy, ix, iy;
unsigned lx, ly;
hx = __HI(x); ix = hx&0x7fffffff;
lx = __LO(x);
hy = __HI(y); iy = hy&0x7fffffff;
ly = __LO(y);
if(((ix|((lx|-lx)>>31))>0x7ff00000)||
((iy|((ly|-ly)>>31))>0x7ff00000)) /* x or y is NaN */
return x+y;
if((hx-0x3ff00000|lx)==0) return atan(y); /* x=1.0 */
m = ((hy>>31)&1)|((hx>>30)&2); /* 2*sign(x)+sign(y) */
hx = __HI (x);
ix = hx & 0x7fffffff;
lx = __LO (x);
hy = __HI (y);
iy = hy & 0x7fffffff;
ly = __LO (y);
if (((ix | ((lx | -lx) >> 31)) > 0x7ff00000) || ((iy | ((ly | -ly) >> 31)) > 0x7ff00000)) /* x or y is NaN */
{
return x + y;
}
if ((hx - 0x3ff00000 | lx) == 0) /* x = 1.0 */
{
return atan (y);
}
m = ((hy >> 31) & 1) | ((hx >> 30) & 2); /* 2 * sign(x) + sign(y) */
/* when y = 0 */
if((iy|ly)==0) {
switch(m) {
case 0:
case 1: return y; /* atan(+-0,+anything)=+-0 */
case 2: return pi+tiny;/* atan(+0,-anything) = pi */
case 3: return -pi-tiny;/* atan(-0,-anything) =-pi */
}
}
/* when x = 0 */
if((ix|lx)==0) return (hy<0)? -pi_o_2-tiny: pi_o_2+tiny;
/* when x is INF */
if(ix==0x7ff00000) {
if(iy==0x7ff00000) {
switch(m) {
case 0: return pi_o_4+tiny;/* atan(+INF,+INF) */
case 1: return -pi_o_4-tiny;/* atan(-INF,+INF) */
case 2: return 3.0*pi_o_4+tiny;/*atan(+INF,-INF)*/
case 3: return -3.0*pi_o_4-tiny;/*atan(-INF,-INF)*/
}
} else {
switch(m) {
case 0: return zero ; /* atan(+...,+INF) */
case 1: return -zero ; /* atan(-...,+INF) */
case 2: return pi+tiny ; /* atan(+...,-INF) */
case 3: return -pi-tiny ; /* atan(-...,-INF) */
}
}
}
/* when y is INF */
if(iy==0x7ff00000) return (hy<0)? -pi_o_2-tiny: pi_o_2+tiny;
/* when y = 0 */
if ((iy | ly) == 0)
{
switch (m)
{
case 0:
case 1:
{
return y; /* atan(+-0,+anything) = +-0 */
}
case 2:
{
return pi + tiny; /* atan(+0,-anything) = pi */
}
case 3:
{
return -pi - tiny; /* atan(-0,-anything) = -pi */
}
}
}
/* when x = 0 */
if ((ix | lx) == 0)
{
return (hy < 0) ? -pi_o_2 - tiny : pi_o_2 + tiny;
}
/* compute y/x */
k = (iy-ix)>>20;
if(k > 60) z=pi_o_2+0.5*pi_lo; /* |y/x| > 2**60 */
else if(hx<0&&k<-60) z=0.0; /* |y|/x < -2**60 */
else z=atan(fabs(y/x)); /* safe to do y/x */
switch (m) {
case 0: return z ; /* atan(+,+) */
case 1: __HI(z) ^= 0x80000000;
return z ; /* atan(-,+) */
case 2: return pi-(z-pi_lo);/* atan(+,-) */
default: /* case 3 */
return (z-pi_lo)-pi;/* atan(-,-) */
}
}
/* when x is INF */
if (ix == 0x7ff00000)
{
if (iy == 0x7ff00000)
{
switch (m)
{
case 0: /* atan(+INF,+INF) */
{
return pi_o_4 + tiny;
}
case 1: /* atan(-INF,+INF) */
{
return -pi_o_4 - tiny;
}
case 2: /* atan(+INF,-INF) */
{
return 3.0 * pi_o_4 + tiny;
}
case 3: /* atan(-INF,-INF) */
{
return -3.0 * pi_o_4 - tiny;
}
}
}
else
{
switch (m)
{
case 0: /* atan(+...,+INF) */
{
return zero;
}
case 1: /* atan(-...,+INF) */
{
return -zero;
}
case 2: /* atan(+...,-INF) */
{
return pi + tiny;
}
case 3: /* atan(-...,-INF) */
{
return -pi - tiny;
}
}
}
}
/* when y is INF */
if (iy == 0x7ff00000)
{
return (hy < 0) ? -pi_o_2 - tiny : pi_o_2 + tiny;
}
/* compute y / x */
k = (iy - ix) >> 20;
if (k > 60) /* |y / x| > 2**60 */
{
z = pi_o_2 + 0.5 * pi_lo;
}
else if (hx < 0 && k < -60) /* |y| / x < -2**60 */
{
z = 0.0;
}
else /* safe to do y / x */
{
z = atan (fabs (y / x));
}
switch (m)
{
case 0: /* atan(+,+) */
{
return z;
}
case 1: /* atan(-,+) */
{
__HI (z) ^= 0x80000000;
return z;
}
case 2: /* atan(+,-) */
{
return pi - (z - pi_lo);
}
/* case 3: */
default: /* atan(-,-) */
{
return (z - pi_lo) - pi;
}
}
} /* atan2 */