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-rw-r--r--math/s_cacoshf.c33
1 files changed, 13 insertions, 20 deletions
diff --git a/math/s_cacoshf.c b/math/s_cacoshf.c
index 74cb2760d6..1e692f139e 100644
--- a/math/s_cacoshf.c
+++ b/math/s_cacoshf.c
@@ -64,32 +64,25 @@ __cacoshf (__complex__ float x)
__real__ res = 0.0;
__imag__ res = __copysignf (M_PI_2, __imag__ x);
}
- /* The factor 16 is just a guess. */
- else if (16.0 * fabsf (__imag__ x) < fabsf (__real__ x))
- {
- /* Kahan's formula which avoid cancellation through subtraction in
- some cases. */
- res = 2.0 * __clogf (__csqrtf ((x + 1.0) / 2.0)
- + __csqrtf ((x - 1.0) / 2.0));
- if (signbit (__real__ res))
- __real__ res = 0.0f;
- }
else
{
__complex__ float y;
- __real__ y = (__real__ x - __imag__ x) * (__real__ x + __imag__ x) - 1.0;
- __imag__ y = 2.0 * __real__ x * __imag__ x;
-
- y = __csqrtf (y);
+ __real__ y = -__imag__ x;
+ __imag__ y = __real__ x;
- if (signbit (__real__ x))
- y = -y;
+ y = __kernel_casinhf (y, 1);
- __real__ y += __real__ x;
- __imag__ y += __imag__ x;
-
- res = __clogf (y);
+ if (signbit (__imag__ x))
+ {
+ __real__ res = __real__ y;
+ __imag__ res = -__imag__ y;
+ }
+ else
+ {
+ __real__ res = -__real__ y;
+ __imag__ res = __imag__ y;
+ }
}
return res;