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* msun/man/cosh.3:

Browse Source 
* msun/man/sinh.3:
* msun/man/tanh.3:
  . Fix grammar.

* msun/src/e_coshl.c:
* msun/src/e_sinhl.c:
  . Fix comment.

* msun/src/s_tanhl.c:
  . Remove unused variables.
  . Fix location/indentation of comments.
  . Use comparison involving ints instead of long double.
  . Re-order polynomial evaluation on ld128 for |x| < 0.25.
    For now, retain the older order in an "#if 0 ... #else" block.
  . Use int comparison to short-circuit the |x| < 1.5 condition.

Requested by:	bde
This commit is contained in:
kargl 2013-12-31 23:59:33 +00:00
parent fbdc3a9423
commit ffedbbec02
6 changed files with 18 additions and 10 deletions
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2
lib/msun/man/cosh.3
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@ -50,7 +50,7 @@
The
.Fn cosh ,
.Fn coshf ,
and the
and
.Fn coshl
functions compute the hyperbolic cosine of
.Fa x .

2
lib/msun/man/sinh.3
View File

@ -50,7 +50,7 @@
The
.Fn sinh ,
.Fn sinhf ,
and the
and
.Fn sinhl
functions compute the hyperbolic sine of
.Fa x .

2
lib/msun/man/tanh.3
View File

@ -50,7 +50,7 @@
The
.Fn tanh ,
.Fn tanhf ,
and the
and
.Fn tanhl
functions compute the hyperbolic tangent of
.Fa x .

2
lib/msun/src/e_coshl.c
View File

@ -78,7 +78,7 @@ C26 = 2.5022374732804632e-27; /* 0x18c7ecf8b2c4a0.0p-141 */
#error "Unsupported long double format"
#endif /* LDBL_MANT_DIG == 64 */
/* log(2**16385 - 0.5) rounded towards up: */
/* log(2**16385 - 0.5) rounded up: */
static const float
o_threshold = 1.13572168e4; /* 0xb174de.0p-10 */

2
lib/msun/src/e_sinhl.c
View File

@ -77,7 +77,7 @@ S25 = 6.5067867911512749e-26; /* 0x1423352626048a.0p-136 */
#error "Unsupported long double format"
#endif /* LDBL_MANT_DIG == 64 */
/* log(2**16385 - 0.5) rounded towards up: */
/* log(2**16385 - 0.5) rounded up: */
static const float
o_threshold = 1.13572168e4; /* 0xb174de.0p-10 */

18
lib/msun/src/s_tanhl.c
View File

@ -86,9 +86,8 @@ static inline long double
divl(long double a, long double b, long double c, long double d,
long double e, long double f)
{
long double inv, r, w;
long double inv, r;
float fr, fw;
uint32_t hx;
_2sumF(a, c);
b = b + c;
@ -128,12 +127,13 @@ tanhl(long double x)
ENTERI();
if (fabsl(x) < 40) { /* |x|<40 */
/* |x| < 40 */
if (ix < 0x4004 || fabsl(x) < 40) { /* |x|<40 */
if (__predict_false(ix<BIAS-(LDBL_MANT_DIG+1)/2)) { /* |x|<TINY */
/* tanh(+-0) = +0; tanh(tiny) = tiny(-+) with inexact: */
return (x == 0 ? x : (0x1p200 * x - x) * 0x1p-200);
}
if (fabsl(x) < 0.25) { /* |x|<0.25 */
if (ix<0x3ffd) { /* |x|<0.25 */
x2 = x*x;
#if LDBL_MANT_DIG == 64
x4 = x2*x2;
@ -142,15 +142,23 @@ tanhl(long double x)
T3*(x2*x) + x);
#elif LDBL_MANT_DIG == 113
dx2 = x2;
#if 0
RETURNI(((((((((((((((T33*dx2 + T31)*dx2 + T29)*dx2 + T27)*dx2 +
T25)*x2 + T23)*x2 + T21)*x2 + T19)*x2 + T17)*x2 +
T15)*x2 + T13)*x2 + T11)*x2 + T9)*x2 + T7)*x2 + T5)*
(x2*x*x2) +
T3*(x2*x) + x);
#else
long double q = ((((((((((((((T33*dx2 + T31)*dx2 + T29)*dx2 + T27)*dx2 +
T25)*x2 + T23)*x2 + T21)*x2 + T19)*x2 + T17)*x2 +
T15)*x2 + T13)*x2 + T11)*x2 + T9)*x2 + T7)*x2 + T5)*
(x2*x*x2);
RETURNI(q + T3*(x2*x) + x);
#endif
#endif
}
k_hexpl(2*fabsl(x), &hi, &lo);
if (fabsl(x) < 1.5) /* |x|<1.5 */
if (ix<0x4001 && fabsl(x) < 1.5) /* |x|<1.5 */
z = divl(hi, lo, -0.5, hi, lo, 0.5);
else
z = one - one/(lo+0.5+hi);