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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
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third-party/fdlibm/s_floor.c
Vendored
+92 -48
View File
@@ -6,65 +6,109 @@
*
* 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.
* ====================================================
*/
/*
* floor(x)
/* floor(x)
* Return x rounded toward -inf to integral value
*
* Method:
* Bit twiddling.
* Bit twiddling.
*
* Exception:
* Inexact flag raised if x not equal to floor(x).
* Inexact flag raised if x not equal to floor(x).
*/
#include "fdlibm.h"
#define huge 1.0e300
double floor(double x)
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) return x; /* x is integral */
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) return x+x; /* inf or NaN */
else return x; /* x is integral */
} else {
i = ((unsigned)(0xffffffff))>>(j0-20);
if((i1&i)==0) return x; /* x is integral */
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) i0 +=1 ; /* got a carry */
i1=j;
}
}
i1 &= (~i);
}
}
__HI(x) = i0;
__LO(x) = i1;
return 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 */