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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/e_sinh.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/e_sinh.c')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/e_sinh.c | 36 |
1 files changed, 15 insertions, 21 deletions
diff --git a/sysdeps/ieee754/dbl-64/e_sinh.c b/sysdeps/ieee754/dbl-64/e_sinh.c index 1701b9bb67..50463c3048 100644 --- a/sysdeps/ieee754/dbl-64/e_sinh.c +++ b/sysdeps/ieee754/dbl-64/e_sinh.c @@ -5,7 +5,7 @@ * * Developed at SunPro, 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. * ==================================================== */ @@ -15,15 +15,15 @@ static char rcsid[] = "$NetBSD: e_sinh.c,v 1.7 1995/05/10 20:46:13 jtc Exp $"; #endif /* __ieee754_sinh(x) - * Method : + * Method : * mathematically sinh(x) if defined to be (exp(x)-exp(-x))/2 - * 1. Replace x by |x| (sinh(-x) = -sinh(x)). - * 2. - * E + E/(E+1) + * 1. Replace x by |x| (sinh(-x) = -sinh(x)). + * 2. + * E + E/(E+1) * 0 <= x <= 22 : sinh(x) := --------------, E=expm1(x) - * 2 + * 2 * - * 22 <= x <= lnovft : sinh(x) := exp(x)/2 + * 22 <= x <= lnovft : sinh(x) := exp(x)/2 * lnovft <= x <= ln2ovft: sinh(x) := exp(x/2)/2 * exp(x/2) * ln2ovft < x : sinh(x) := x*shuge (overflow) * @@ -35,19 +35,11 @@ static char rcsid[] = "$NetBSD: e_sinh.c,v 1.7 1995/05/10 20:46:13 jtc Exp $"; #include "math.h" #include "math_private.h" -#ifdef __STDC__ static const double one = 1.0, shuge = 1.0e307; -#else -static double one = 1.0, shuge = 1.0e307; -#endif -#ifdef __STDC__ - double __ieee754_sinh(double x) -#else - double __ieee754_sinh(x) - double x; -#endif -{ +double +__ieee754_sinh(double x) +{ double t,w,h; int32_t ix,jx; u_int32_t lx; @@ -57,14 +49,15 @@ static double one = 1.0, shuge = 1.0e307; ix = jx&0x7fffffff; /* x is INF or NaN */ - if(ix>=0x7ff00000) return x+x; + if(__builtin_expect(ix>=0x7ff00000, 0)) return x+x; h = 0.5; if (jx<0) h = -h; /* |x| in [0,22], return sign(x)*0.5*(E+E/(E+1))) */ if (ix < 0x40360000) { /* |x|<22 */ - if (ix<0x3e300000) /* |x|<2**-28 */ - if(shuge+x>one) return x;/* sinh(tiny) = tiny with inexact */ + if (__builtin_expect(ix<0x3e300000, 0)) /* |x|<2**-28 */ + if(shuge+x>one) + return x;/* sinh(tiny) = tiny with inexact */ t = __expm1(fabs(x)); if(ix<0x3ff00000) return h*(2.0*t-t*t/(t+one)); return h*(t+t/(t+one)); @@ -84,3 +77,4 @@ static double one = 1.0, shuge = 1.0e307; /* |x| > overflowthresold, sinh(x) overflow */ return x*shuge; } +strong_alias (__ieee754_sinh, __sinh_finite) |