#include "libm.h"
static const float
-one = 1.0,
ln2 = 6.9314718246e-01; /* 0x3f317218 */
float acoshf(float x)
return x + x;
return logf(x) + ln2; /* acosh(huge)=log(2x) */
} else if (hx == 0x3f800000) {
- return 0.0; /* acosh(1) = 0 */
+ return 0.0f; /* acosh(1) = 0 */
} else if (hx > 0x40000000) { /* 2**28 > x > 2 */
t = x*x;
- return logf((float)2.0*x - one/(x+sqrtf(t-one)));
+ return logf(2.0f*x - 1.0f/(x+sqrtf(t-1.0f)));
} else { /* 1 < x < 2 */
- t = x-one;
- return log1pf(t + sqrtf((float)2.0*t+t*t));
+ t = x-1.0f;
+ return log1pf(t + sqrtf(2.0f*t+t*t));
}
}