| Index: fusl/src/math/atanh.c
|
| diff --git a/fusl/src/math/atanh.c b/fusl/src/math/atanh.c
|
| index 63a035d7063ae2d5df2c31728e10e5d471209c79..291cf15fa35514a717c0c2cd78cd36057fa08c21 100644
|
| --- a/fusl/src/math/atanh.c
|
| +++ b/fusl/src/math/atanh.c
|
| @@ -1,29 +1,31 @@
|
| #include "libm.h"
|
|
|
| /* atanh(x) = log((1+x)/(1-x))/2 = log1p(2x/(1-x))/2 ~= x + x^3/3 + o(x^5) */
|
| -double atanh(double x)
|
| -{
|
| - union {double f; uint64_t i;} u = {.f = x};
|
| - unsigned e = u.i >> 52 & 0x7ff;
|
| - unsigned s = u.i >> 63;
|
| - double_t y;
|
| +double atanh(double x) {
|
| + union {
|
| + double f;
|
| + uint64_t i;
|
| + } u = {.f = x};
|
| + unsigned e = u.i >> 52 & 0x7ff;
|
| + unsigned s = u.i >> 63;
|
| + double_t y;
|
|
|
| - /* |x| */
|
| - u.i &= (uint64_t)-1/2;
|
| - y = u.f;
|
| + /* |x| */
|
| + u.i &= (uint64_t)-1 / 2;
|
| + y = u.f;
|
|
|
| - if (e < 0x3ff - 1) {
|
| - if (e < 0x3ff - 32) {
|
| - /* handle underflow */
|
| - if (e == 0)
|
| - FORCE_EVAL((float)y);
|
| - } else {
|
| - /* |x| < 0.5, up to 1.7ulp error */
|
| - y = 0.5*log1p(2*y + 2*y*y/(1-y));
|
| - }
|
| - } else {
|
| - /* avoid overflow */
|
| - y = 0.5*log1p(2*(y/(1-y)));
|
| - }
|
| - return s ? -y : y;
|
| + if (e < 0x3ff - 1) {
|
| + if (e < 0x3ff - 32) {
|
| + /* handle underflow */
|
| + if (e == 0)
|
| + FORCE_EVAL((float)y);
|
| + } else {
|
| + /* |x| < 0.5, up to 1.7ulp error */
|
| + y = 0.5 * log1p(2 * y + 2 * y * y / (1 - y));
|
| + }
|
| + } else {
|
| + /* avoid overflow */
|
| + y = 0.5 * log1p(2 * (y / (1 - y)));
|
| + }
|
| + return s ? -y : y;
|
| }
|
|
|