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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_fmod.c
Vendored
+189 -104
View File
@@ -11,124 +11,209 @@
* ====================================================
*/
/*
* fmod(x,y)
/* fmod(x,y)
* Return x mod y in exact arithmetic
*
* Method: shift and subtract
*/
#include "fdlibm.h"
static const double
Zero[] = {0.0, -0.0,};
static const double Zero[] = { 0.0, -0.0, };
#define one 1.0
double fmod(double x, double y)
double
fmod (double x, double y)
{
int n,hx,hy,hz,ix,iy,sx,i;
unsigned lx,ly,lz;
int n, hx, hy, hz, ix, iy, sx, i;
unsigned lx, ly, lz;
hx = __HI(x); /* high word of x */
lx = __LO(x); /* low word of x */
hy = __HI(y); /* high word of y */
ly = __LO(y); /* low word of y */
sx = hx&0x80000000; /* sign of x */
hx ^=sx; /* |x| */
hy &= 0x7fffffff; /* |y| */
hx = __HI (x); /* high word of x */
lx = __LO (x); /* low word of x */
hy = __HI (y); /* high word of y */
ly = __LO (y); /* low word of y */
sx = hx & 0x80000000; /* sign of x */
hx ^= sx; /* |x| */
hy &= 0x7fffffff; /* |y| */
/* purge off exception values */
if((hy|ly)==0||(hx>=0x7ff00000)|| /* y=0,or x not finite */
((hy|((ly|-ly)>>31))>0x7ff00000)) /* or y is NaN */
return (x*y)/(x*y);
if(hx<=hy) {
if((hx<hy)||(lx<ly)) return x; /* |x|<|y| return x */
if(lx==ly)
return Zero[(unsigned)sx>>31]; /* |x|=|y| return x*0*/
}
/* purge off exception values */
if ((hy | ly) == 0 || (hx >= 0x7ff00000) || /* y = 0, or x not finite */
((hy | ((ly | -ly) >> 31)) > 0x7ff00000)) /* or y is NaN */
{
return (x * y) / (x * y);
}
if (hx <= hy)
{
if ((hx < hy) || (lx < ly)) /* |x| < |y| return x */
{
return x;
}
if (lx == ly) /* |x| = |y| return x * 0 */
{
return Zero[(unsigned) sx >> 31];
}
}
/* determine ix = ilogb(x) */
if(hx<0x00100000) { /* subnormal x */
if(hx==0) {
for (ix = -1043, i=lx; i>0; i<<=1) ix -=1;
} else {
for (ix = -1022,i=(hx<<11); i>0; i<<=1) ix -=1;
}
} else ix = (hx>>20)-1023;
/* determine ix = ilogb(x) */
if (hx < 0x00100000) /* subnormal x */
{
if (hx == 0)
{
for (ix = -1043, i = lx; i > 0; i <<= 1)
{
ix -= 1;
}
}
else
{
for (ix = -1022, i = (hx << 11); i > 0; i <<= 1)
{
ix -= 1;
}
}
}
else
{
ix = (hx >> 20) - 1023;
}
/* determine iy = ilogb(y) */
if(hy<0x00100000) { /* subnormal y */
if(hy==0) {
for (iy = -1043, i=ly; i>0; i<<=1) iy -=1;
} else {
for (iy = -1022,i=(hy<<11); i>0; i<<=1) iy -=1;
}
} else iy = (hy>>20)-1023;
/* determine iy = ilogb(y) */
if (hy < 0x00100000) /* subnormal y */
{
if (hy == 0)
{
for (iy = -1043, i = ly; i > 0; i <<= 1)
{
iy -= 1;
}
}
else
{
for (iy = -1022, i = (hy << 11); i > 0; i <<= 1)
{
iy -= 1;
}
}
}
else
{
iy = (hy >> 20) - 1023;
}
/* set up {hx,lx}, {hy,ly} and align y to x */
if(ix >= -1022)
hx = 0x00100000|(0x000fffff&hx);
else { /* subnormal x, shift x to normal */
n = -1022-ix;
if(n<=31) {
hx = (hx<<n)|(lx>>(32-n));
lx <<= n;
} else {
hx = lx<<(n-32);
lx = 0;
}
}
if(iy >= -1022)
hy = 0x00100000|(0x000fffff&hy);
else { /* subnormal y, shift y to normal */
n = -1022-iy;
if(n<=31) {
hy = (hy<<n)|(ly>>(32-n));
ly <<= n;
} else {
hy = ly<<(n-32);
ly = 0;
}
}
/* set up {hx,lx}, {hy,ly} and align y to x */
if (ix >= -1022)
{
hx = 0x00100000 | (0x000fffff & hx);
}
else /* subnormal x, shift x to normal */
{
n = -1022 - ix;
if (n <= 31)
{
hx = (hx << n) | (lx >> (32 - n));
lx <<= n;
}
else
{
hx = lx << (n - 32);
lx = 0;
}
}
if (iy >= -1022)
{
hy = 0x00100000 | (0x000fffff & hy);
}
else /* subnormal y, shift y to normal */
{
n = -1022 - iy;
if (n <= 31)
{
hy = (hy << n) | (ly >> (32 - n));
ly <<= n;
}
else
{
hy = ly << (n - 32);
ly = 0;
}
}
/* fix point fmod */
n = ix - iy;
while(n--) {
hz=hx-hy;lz=lx-ly; if(lx<ly) hz -= 1;
if(hz<0){hx = hx+hx+(lx>>31); lx = lx+lx;}
else {
if((hz|lz)==0) /* return sign(x)*0 */
return Zero[(unsigned)sx>>31];
hx = hz+hz+(lz>>31); lx = lz+lz;
}
}
hz=hx-hy;lz=lx-ly; if(lx<ly) hz -= 1;
if(hz>=0) {hx=hz;lx=lz;}
/* fix point fmod */
n = ix - iy;
while (n--)
{
hz = hx - hy;
lz = lx - ly;
if (lx < ly)
{
hz -= 1;
}
if (hz < 0)
{
hx = hx + hx + (lx >> 31);
lx = lx + lx;
}
else
{
if ((hz | lz) == 0) /* return sign(x) * 0 */
{
return Zero[(unsigned) sx >> 31];
}
hx = hz + hz + (lz >> 31);
lx = lz + lz;
}
}
hz = hx - hy;
lz = lx - ly;
if (lx < ly)
{
hz -= 1;
}
if (hz >= 0)
{
hx = hz;
lx = lz;
}
/* convert back to floating value and restore the sign */
if((hx|lx)==0) /* return sign(x)*0 */
return Zero[(unsigned)sx>>31];
while(hx<0x00100000) { /* normalize x */
hx = hx+hx+(lx>>31); lx = lx+lx;
iy -= 1;
}
if(iy>= -1022) { /* normalize output */
hx = ((hx-0x00100000)|((iy+1023)<<20));
__HI(x) = hx|sx;
__LO(x) = lx;
} else { /* subnormal output */
n = -1022 - iy;
if(n<=20) {
lx = (lx>>n)|((unsigned)hx<<(32-n));
hx >>= n;
} else if (n<=31) {
lx = (hx<<(32-n))|(lx>>n); hx = sx;
} else {
lx = hx>>(n-32); hx = sx;
}
__HI(x) = hx|sx;
__LO(x) = lx;
x *= one; /* create necessary signal */
}
return x; /* exact output */
}
/* convert back to floating value and restore the sign */
if ((hx | lx) == 0) /* return sign(x) * 0 */
{
return Zero[(unsigned) sx >> 31];
}
while (hx < 0x00100000) /* normalize x */
{
hx = hx + hx + (lx >> 31);
lx = lx + lx;
iy -= 1;
}
if (iy >= -1022) /* normalize output */
{
hx = ((hx - 0x00100000) | ((iy + 1023) << 20));
__HI (x) = hx | sx;
__LO (x) = lx;
}
else /* subnormal output */
{
n = -1022 - iy;
if (n <= 20)
{
lx = (lx >> n) | ((unsigned) hx << (32 - n));
hx >>= n;
}
else if (n <= 31)
{
lx = (hx << (32 - n)) | (lx >> n);
hx = sx;
}
else
{
lx = hx >> (n - 32);
hx = sx;
}
__HI (x) = hx | sx;
__LO (x) = lx;
x *= one; /* create necessary signal */
}
return x; /* exact output */
} /* fmod */