float __builtin_tanhf(float x)
{
float t,z;
int jx,ix;
GET_FLOAT_WORD(jx,x);
ix = jx&0x7fffffff;
/* x is INF or NaN */
if(!FLT_UWORD_IS_FINITE(ix)) {
if (jx>=0) return one/x+one; /* tanh(+-inf)=+-1 */
else return __builtin_nanf(""); /* tanh(NaN) = NaN */
}
/* |x| < 22 */
if (ix < 0x41b00000) { /* |x|<22 */
if (ix<0x24000000) /* |x|<2**-55 */
return x*(one+x); /* tanh(small) = small */
if (ix>=0x3f800000) { /* |x|>=1 */
t = __builtin_expm1f(two*__builtin_fabsf(x));
z = one - two/(t+two);
} else {
t = __builtin_expm1f(-two*__builtin_fabsf(x));
z= -t/(t+two);
}
/* |x| > 22, return +-1 */
} else {
z = one - tiny; /* raised inexact flag */
}
return (jx>=0)? z: -z;
}
void
test_float_expm1 (void)
{
int i;
for (i = 0; i < SIZE; i++)
f1[i] = __builtin_expm1f (f2[i]);
}
