don't remap internal-use syscall macros to nonexistent time32 syscalls

[musl] / src / math / atanh.c

diff --git a/src/math/atanh.c b/src/math/atanh.c
index 84a84c6..63a035d 100644 (file)
--- a/src/math/atanh.c
+++ b/src/math/atanh.c
@@ -6,16 +6,24 @@ 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;
-       x = u.f;
+       y = u.f;
 
        if (e < 0x3ff - 1) {
-               /* |x| < 0.5, up to 1.7ulp error */
-               x = 0.5*log1p(2*x + 2*x*x/(1-x));
+               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 {
-               x = 0.5*log1p(2*x/(1-x));
+               /* avoid overflow */
+               y = 0.5*log1p(2*(y/(1-y)));
        }
-       return s ? -x : x;
+       return s ? -y : y;
 }