diff options
Diffstat (limited to 'sysdeps/ieee754/ldbl-128ibm/s_ctanl.c')
| -rw-r--r-- | sysdeps/ieee754/ldbl-128ibm/s_ctanl.c | 34 |
1 files changed, 24 insertions, 10 deletions
diff --git a/sysdeps/ieee754/ldbl-128ibm/s_ctanl.c b/sysdeps/ieee754/ldbl-128ibm/s_ctanl.c index 9d89bbe311..34a370a308 100644 --- a/sysdeps/ieee754/ldbl-128ibm/s_ctanl.c +++ b/sysdeps/ieee754/ldbl-128ibm/s_ctanl.c @@ -25,6 +25,8 @@ #include <math_private.h> +/* IBM long double GCC builtin sets LDBL_EPSILON == LDBL_DENORM_MIN */ +static const long double ldbl_eps = 0x1p-106L; __complex__ long double __ctanl (__complex__ long double x) @@ -55,7 +57,7 @@ __ctanl (__complex__ long double x) { long double sinrx, cosrx; long double den; - const int t = (int) ((LDBL_MAX_EXP - 1) * M_LN2l / 2); + const int t = (int) ((LDBL_MAX_EXP - 1) * M_LN2l / 2.0L); /* tan(x+iy) = (sin(2x) + i*sinh(2y))/(cos(2x) + cosh(2y)) = (sin(x)*cos(x) + i*sinh(y)*cosh(y)/(cos(x)^2 + sinh(y)^2). */ @@ -70,7 +72,7 @@ __ctanl (__complex__ long double x) sin(x)*cos(x)/sinh(y)^2 = 4*sin(x)*cos(x)/exp(2y). */ long double exp_2t = __ieee754_expl (2 * t); - __imag__ res = __copysignl (1.0, __imag__ x); + __imag__ res = __copysignl (1.0L, __imag__ x); __real__ res = 4 * sinrx * cosrx; __imag__ x = fabsl (__imag__ x); __imag__ x -= t; @@ -82,23 +84,35 @@ __ctanl (__complex__ long double x) __real__ res /= exp_2t; } else - __real__ res /= __ieee754_expl (2 * __imag__ x); + __real__ res /= __ieee754_expl (2.0L * __imag__ x); } else { - long double sinhix = __ieee754_sinhl (__imag__ x); - long double coshix = __ieee754_coshl (__imag__ x); + long double sinhix, coshix; + if (fabsl (__imag__ x) > LDBL_MIN) + { + sinhix = __ieee754_sinhl (__imag__ x); + coshix = __ieee754_coshl (__imag__ x); + } + else + { + sinhix = __imag__ x; + coshix = 1.0L; + } - den = cosrx * cosrx + sinhix * sinhix; - __real__ res = sinrx * cosrx / den; - __imag__ res = sinhix * coshix / den; + if (fabsl (sinhix) > fabsl (cosrx) * ldbl_eps) + den = cosrx * cosrx + sinhix * sinhix; + else + den = cosrx * cosrx; + __real__ res = sinrx * (cosrx / den); + __imag__ res = sinhix * (coshix / den); } /* __gcc_qmul does not respect -0.0 so we need the following fixup. */ - if ((__real__ res == 0.0) && (__real__ x == 0.0)) + if ((__real__ res == 0.0L) && (__real__ x == 0.0L)) __real__ res = __real__ x; - if ((__real__ res == 0.0) && (__imag__ x == 0.0)) + if ((__real__ res == 0.0L) && (__imag__ x == 0.0L)) __imag__ res = __imag__ x; } |