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| author | Ulrich Drepper <drepper@gmail.com> | 2011-10-12 11:27:51 -0400 |
|---|---|---|
| committer | Ulrich Drepper <drepper@gmail.com> | 2011-10-12 11:27:51 -0400 |
| commit | 0ac5ae2335292908f39031b1ea9fe8edce433c0f (patch) | |
| tree | f9d26c8abc0de39d18d4c13e70f6022cdc6b461f /sysdeps/ieee754/dbl-64/s_asinh.c | |
| parent | a843a204a3e8a0dd53584dad3668771abaec84ac (diff) | |
| download | glibc-0ac5ae2335292908f39031b1ea9fe8edce433c0f.tar.gz glibc-0ac5ae2335292908f39031b1ea9fe8edce433c0f.tar.xz glibc-0ac5ae2335292908f39031b1ea9fe8edce433c0f.zip | |
Optimize libm
libm is now somewhat integrated with gcc's -ffinite-math-only option and lots of the wrapper functions have been optimized.
Diffstat (limited to 'sysdeps/ieee754/dbl-64/s_asinh.c')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/s_asinh.c | 40 |
1 files changed, 15 insertions, 25 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_asinh.c b/sysdeps/ieee754/dbl-64/s_asinh.c index 985cfe32e1..93789fb41e 100644 --- a/sysdeps/ieee754/dbl-64/s_asinh.c +++ b/sysdeps/ieee754/dbl-64/s_asinh.c @@ -10,10 +10,6 @@ * ==================================================== */ -#if defined(LIBM_SCCS) && !defined(lint) -static char rcsid[] = "$NetBSD: s_asinh.c,v 1.9 1995/05/12 04:57:37 jtc Exp $"; -#endif - /* asinh(x) * Method : * Based on @@ -28,40 +24,34 @@ static char rcsid[] = "$NetBSD: s_asinh.c,v 1.9 1995/05/12 04:57:37 jtc Exp $"; #include "math.h" #include "math_private.h" -#ifdef __STDC__ static const double -#else -static double -#endif one = 1.00000000000000000000e+00, /* 0x3FF00000, 0x00000000 */ ln2 = 6.93147180559945286227e-01, /* 0x3FE62E42, 0xFEFA39EF */ huge= 1.00000000000000000000e+300; -#ifdef __STDC__ - double __asinh(double x) -#else - double __asinh(x) - double x; -#endif +double +__asinh(double x) { - double t,w; + double w; int32_t hx,ix; GET_HIGH_WORD(hx,x); ix = hx&0x7fffffff; - if(ix>=0x7ff00000) return x+x; /* x is inf or NaN */ - if(ix< 0x3e300000) { /* |x|<2**-28 */ + if(__builtin_expect(ix< 0x3e300000, 0)) { /* |x|<2**-28 */ if(huge+x>one) return x; /* return x inexact except 0 */ } - if(ix>0x41b00000) { /* |x| > 2**28 */ + if(__builtin_expect(ix>0x41b00000, 0)) { /* |x| > 2**28 */ + if(ix>=0x7ff00000) return x+x; /* x is inf or NaN */ w = __ieee754_log(fabs(x))+ln2; - } else if (ix>0x40000000) { /* 2**28 > |x| > 2.0 */ - t = fabs(x); - w = __ieee754_log(2.0*t+one/(__ieee754_sqrt(x*x+one)+t)); - } else { /* 2.0 > |x| > 2**-28 */ - t = x*x; - w =__log1p(fabs(x)+t/(one+__ieee754_sqrt(one+t))); + } else { + double xa = fabs(x); + if (ix>0x40000000) { /* 2**28 > |x| > 2.0 */ + w = __ieee754_log(2.0*xa+one/(__ieee754_sqrt(xa*xa+one)+xa)); + } else { /* 2.0 > |x| > 2**-28 */ + double t = xa*xa; + w =__log1p(xa+t/(one+__ieee754_sqrt(one+t))); + } } - if(hx>0) return w; else return -w; + return __copysign(w, x); } weak_alias (__asinh, asinh) #ifdef NO_LONG_DOUBLE |