diff options
Diffstat (limited to 'src/math/tanhf.c')
| -rw-r--r-- | src/math/tanhf.c | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/src/math/tanhf.c b/src/math/tanhf.c index 97d0eb53..7cb459d0 100644 --- a/src/math/tanhf.c +++ b/src/math/tanhf.c @@ -15,7 +15,9 @@ #include "libm.h" -static const float one = 1.0, two = 2.0, tiny = 1.0e-30, huge = 1.0e30; +static const float +tiny = 1.0e-30, +huge = 1.0e30; float tanhf(float x) { @@ -28,26 +30,26 @@ float tanhf(float x) /* x is INF or NaN */ if(ix >= 0x7f800000) { 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 < 0x41100000) { /* |x| < 9 */ if (ix < 0x39800000) { /* |x| < 2**-12 */ /* tanh(tiny) = tiny with inexact */ - if (huge+x > one) + if (huge+x > 1.0f) return x; } if (ix >= 0x3f800000) { /* |x|>=1 */ - t = expm1f(two*fabsf(x)); - z = one - two/(t+two); + t = expm1f(2.0f*fabsf(x)); + z = 1.0f - 2.0f/(t+2.0f); } else { - t = expm1f(-two*fabsf(x)); - z = -t/(t+two); + t = expm1f(-2.0f*fabsf(x)); + z = -t/(t+2.0f); } } else { /* |x| >= 9, return +-1 */ - z = one - tiny; /* raise inexact */ + z = 1.0f - tiny; /* raise inexact */ } return jx >= 0 ? z : -z; } |