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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_scalbn.c
Vendored
+52 -29
View File
@@ -6,14 +6,12 @@
*
* 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.
* ====================================================
*/
/*
* scalbn (double x, int n)
* scalbn(x,n) returns x* 2**n computed by exponent
/* scalbn(x,n) returns x* 2**n computed by exponent
* manipulation rather than by actually performing an
* exponentiation or a multiplication.
*/
@@ -25,29 +23,54 @@
#define huge 1.0e+300
#define tiny 1.0e-300
double scalbn (double x, int n)
double
scalbn (double x, int n)
{
int k,hx,lx;
hx = __HI(x);
lx = __LO(x);
k = (hx&0x7ff00000)>>20; /* extract exponent */
if (k==0) { /* 0 or subnormal x */
if ((lx|(hx&0x7fffffff))==0) return x; /* +-0 */
x *= two54;
hx = __HI(x);
k = ((hx&0x7ff00000)>>20) - 54;
if (n< -50000) return tiny*x; /*underflow*/
}
if (k==0x7ff) return x+x; /* NaN or Inf */
k = k+n;
if (k > 0x7fe) return huge*copysign(huge,x); /* overflow */
if (k > 0) /* normal result */
{__HI(x) = (hx&0x800fffff)|(k<<20); return x;}
if (k <= -54)
if (n > 50000) /* in case integer overflow in n+k */
return huge*copysign(huge,x); /*overflow*/
else return tiny*copysign(tiny,x); /*underflow*/
k += 54; /* subnormal result */
__HI(x) = (hx&0x800fffff)|(k<<20);
return x*twom54;
}
int k, hx, lx;
hx = __HI (x);
lx = __LO (x);
k = (hx & 0x7ff00000) >> 20; /* extract exponent */
if (k == 0) /* 0 or subnormal x */
{
if ((lx | (hx & 0x7fffffff)) == 0) /* +-0 */
{
return x;
}
x *= two54;
hx = __HI (x);
k = ((hx & 0x7ff00000) >> 20) - 54;
if (n < -50000) /*underflow */
{
return tiny * x;
}
}
if (k == 0x7ff) /* NaN or Inf */
{
return x + x;
}
k = k + n;
if (k > 0x7fe) /* overflow */
{
return huge * copysign (huge, x);
}
if (k > 0) /* normal result */
{
__HI (x) = (hx & 0x800fffff) | (k << 20);
return x;
}
if (k <= -54)
{
if (n > 50000) /* in case integer overflow in n + k */
{
return huge * copysign (huge, x); /*overflow */
}
else
{
return tiny * copysign (tiny, x); /*underflow */
}
}
k += 54; /* subnormal result */
__HI (x) = (hx & 0x800fffff) | (k << 20);
return x * twom54;
} /* scalbn */