Fix cacos real-part inaccuracy for result real part near 0 (bug 15023).

1 files changed, 1 insertions, 42 deletions

diff --git a/math/s_casinhl.c b/math/s_casinhl.c
index d7c74593e4..2afc52714e 100644
--- a/math/s_casinhl.c
+++ b/math/s_casinhl.c
@@ -20,14 +20,6 @@
 #include <complex.h>
 #include <math.h>
 #include <math_private.h>
-#include <float.h>
-
-/* To avoid spurious overflows, use this definition to treat IBM long
-   double as approximating an IEEE-style format.  */
-#if LDBL_MANT_DIG == 106
-# undef LDBL_EPSILON
-# define LDBL_EPSILON 0x1p-106L
-#endif
 
 __complex__ long double
 __casinhl (__complex__ long double x)
@@ -69,40 +61,7 @@ __casinhl (__complex__ long double x)
     }
   else
     {
-      long double rx, ix;
-      __complex__ long double y;
-
-      /* Avoid cancellation by reducing to the first quadrant.  */
-      rx = fabsl (__real__ x);
-      ix = fabsl (__imag__ x);
-
-      if (rx >= 1.0L / LDBL_EPSILON || ix >= 1.0L / LDBL_EPSILON)
-	{
-	  /* For large x in the first quadrant, x + csqrt (1 + x * x)
-	     is sufficiently close to 2 * x to make no significant
-	     difference to the result; avoid possible overflow from
-	     the squaring and addition.  */
-	  __real__ y = rx;
-	  __imag__ y = ix;
-	  res = __clogl (y);
-	  __real__ res += M_LN2l;
-	}
-      else
-	{
-	  __real__ y = (rx - ix) * (rx + ix) + 1.0;
-	  __imag__ y = 2.0 * rx * ix;
-
-	  y = __csqrtl (y);
-
-	  __real__ y += rx;
-	  __imag__ y += ix;
-
-	  res = __clogl (y);
-	}
-
-      /* Give results the correct sign for the original argument.  */
-      __real__ res = __copysignl (__real__ res, __real__ x);
-      __imag__ res = __copysignl (__imag__ res, __imag__ x);
+      res = __kernel_casinhl (x, 0);
     }
 
   return res;