add support for non-option arguments extension to getopt

[musl] / src / math / atanhf.c

diff --git a/src/math/atanhf.c b/src/math/atanhf.c
index ca106ef..65f07c0 100644 (file)
--- a/src/math/atanhf.c
+++ b/src/math/atanhf.c
@@ -5,16 +5,24 @@ float atanhf(float x)
 {
        union {float f; uint32_t i;} u = {.f = x};
        unsigned s = u.i >> 31;
+       float_t y;
 
        /* |x| */
        u.i &= 0x7fffffff;
-       x = u.f;
+       y = u.f;
 
        if (u.i < 0x3f800000 - (1<<23)) {
-               /* |x| < 0.5, up to 1.7ulp error */
-               x = 0.5f*log1pf(2*x + 2*x*x/(1-x));
+               if (u.i < 0x3f800000 - (32<<23)) {
+                       /* handle underflow */
+                       if (u.i < (1<<23))
+                               FORCE_EVAL((float)(y*y));
+               } else {
+                       /* |x| < 0.5, up to 1.7ulp error */
+                       y = 0.5f*log1pf(2*y + 2*y*y/(1-y));
+               }
        } else {
-               x = 0.5f*log1pf(2*x/(1-x));
+               /* avoid overflow */
+               y = 0.5f*log1pf(2*(y/(1-y)));
        }
-       return s ? -x : x;
+       return s ? -y : y;
 }