@@ -46,8 +46,13 @@ static const struct test_c_c_data cacosh_test_data[] =
TEST_c_c (cacosh, plus_infty, qnan_value, plus_infty, qnan_value),
TEST_c_c (cacosh, minus_infty, qnan_value, plus_infty, qnan_value),
- TEST_c_c (cacosh, 0, qnan_value, qnan_value, qnan_value),
- TEST_c_c (cacosh, minus_zero, qnan_value, qnan_value, qnan_value),
+ /* The sign of the imaginary part of the result is unspecified
+ (see
+ <http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2173.htm>),
+ but the libm-test infrastructure does not support describing
+ that. */
+ TEST_c_c (cacosh, 0, qnan_value, qnan_value, lit_pi_2_d),
+ TEST_c_c (cacosh, minus_zero, qnan_value, qnan_value, lit_pi_2_d),
TEST_c_c (cacosh, qnan_value, plus_infty, plus_infty, qnan_value),
TEST_c_c (cacosh, qnan_value, minus_infty, plus_infty, qnan_value),
@@ -57,7 +57,10 @@ M_DECL_FUNC (__cacosh) (CFLOAT x)
else
{
__real__ res = M_NAN;
- __imag__ res = M_NAN;
+ if (rcls == FP_ZERO)
+ __imag__ res = M_MLIT (M_PI_2);
+ else
+ __imag__ res = M_NAN;
}
}
else if (rcls == FP_ZERO && icls == FP_ZERO)