diff options
Diffstat (limited to 'math')
| -rw-r--r-- | math/libm-test-cacosh.inc | 9 | ||||
| -rw-r--r-- | math/s_cacosh_template.c | 5 |
2 files changed, 11 insertions, 3 deletions
diff --git a/math/libm-test-cacosh.inc b/math/libm-test-cacosh.inc index 518cb29aa6..db700b98a4 100644 --- a/math/libm-test-cacosh.inc +++ b/math/libm-test-cacosh.inc @@ -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), diff --git a/math/s_cacosh_template.c b/math/s_cacosh_template.c index 14f0b2a4e6..0014fd444c 100644 --- a/math/s_cacosh_template.c +++ b/math/s_cacosh_template.c @@ -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) |