diff options
Diffstat (limited to 'src/math/tanh.c')
| -rw-r--r-- | src/math/tanh.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/src/math/tanh.c b/src/math/tanh.c index 957c43e9..21138643 100644 --- a/src/math/tanh.c +++ b/src/math/tanh.c @@ -35,7 +35,7 @@ #include "libm.h" -static const double one = 1.0, two = 2.0, tiny = 1.0e-300, huge = 1.0e300; +static const double tiny = 1.0e-300, huge = 1.0e300; double tanh(double x) { @@ -48,26 +48,26 @@ double tanh(double x) /* x is INF or NaN */ if (ix >= 0x7ff00000) { if (jx >= 0) - return one/x + one; /* tanh(+-inf)=+-1 */ + return 1.0f/x + 1.0f; /* tanh(+-inf)=+-1 */ else - return one/x - one; /* tanh(NaN) = NaN */ + return 1.0f/x - 1.0f; /* tanh(NaN) = NaN */ } if (ix < 0x40360000) { /* |x| < 22 */ if (ix < 0x3e300000) { /* |x| < 2**-28 */ /* tanh(tiny) = tiny with inexact */ - if (huge+x > one) + if (huge+x > 1.0f) return x; } if (ix >= 0x3ff00000) { /* |x| >= 1 */ - t = expm1(two*fabs(x)); - z = one - two/(t+two); + t = expm1(2.0f*fabs(x)); + z = 1.0f - 2.0f/(t+2.0f); } else { - t = expm1(-two*fabs(x)); - z= -t/(t+two); + t = expm1(-2.0f*fabs(x)); + z= -t/(t+2.0f); } } else { /* |x| >= 22, return +-1 */ - z = one - tiny; /* raise inexact */ + z = 1.0f - tiny; /* raise inexact */ } return jx >= 0 ? z : -z; } |