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authorJoseph Myers <joseph@codesourcery.com>2017-12-07 16:21:00 +0000
committerJoseph Myers <joseph@codesourcery.com>2017-12-07 16:21:00 +0000
commitd15e83c5f5231d971472b5ffc9219d54056ca0f1 (patch)
treebbc07214991185682fd6fe1dada1907e3fe6608b /math
parentd89756ebe1905c1989179c2f1c2b10ef2fb3354e (diff)
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Fix ctanh (0 + i NaN), ctanh (0 + i Inf) (bug 22568, DR#471).
As per C11 DR#471, ctanh (0 + i NaN) and ctanh (0 + i Inf) should return 0 + i NaN (with "invalid" exception in the second case but not the first), not NaN + i NaN. This has corresponding implications for ctan since its special cases are defined by ctan (z) = -i ctanh (iz). This patch implements these cases for ctanh and ctan, updating tests accordingly. Tested for x86_64. [BZ #22568] * math/s_ctan_template.c (M_DECL_FUNC (__ctan)): Set imaginary part of result to imaginary part of argument if it is zero and the real part of the argument is not finite. * math/s_ctanh_template.c (M_DECL_FUNC (__ctanh)): Set real part of result to real part of argument if it is zero and the imaginary part of the argument is not finite.
Diffstat (limited to 'math')
-rw-r--r--math/libm-test-ctan.inc12
-rw-r--r--math/libm-test-ctanh.inc12
-rw-r--r--math/s_ctan_template.c5
-rw-r--r--math/s_ctanh_template.c5
4 files changed, 20 insertions, 14 deletions
diff --git a/math/libm-test-ctan.inc b/math/libm-test-ctan.inc
index e485828b8c..0c2c584c3a 100644
--- a/math/libm-test-ctan.inc
+++ b/math/libm-test-ctan.inc
@@ -90,13 +90,13 @@ static const struct test_c_c_data ctan_test_data[] =
TEST_c_c (ctan, -0x1.2p16383L, minus_infty, 0.0, -1.0),
#endif
- TEST_c_c (ctan, plus_infty, 0, qnan_value, qnan_value, INVALID_EXCEPTION),
+ TEST_c_c (ctan, plus_infty, 0, qnan_value, 0, INVALID_EXCEPTION),
TEST_c_c (ctan, plus_infty, 2, qnan_value, qnan_value, INVALID_EXCEPTION),
- TEST_c_c (ctan, minus_infty, 0, qnan_value, qnan_value, INVALID_EXCEPTION),
+ TEST_c_c (ctan, minus_infty, 0, qnan_value, 0, INVALID_EXCEPTION),
TEST_c_c (ctan, minus_infty, 2, qnan_value, qnan_value, INVALID_EXCEPTION),
- TEST_c_c (ctan, plus_infty, minus_zero, qnan_value, qnan_value, INVALID_EXCEPTION),
+ TEST_c_c (ctan, plus_infty, minus_zero, qnan_value, minus_zero, INVALID_EXCEPTION),
TEST_c_c (ctan, plus_infty, -2, qnan_value, qnan_value, INVALID_EXCEPTION),
- TEST_c_c (ctan, minus_infty, minus_zero, qnan_value, qnan_value, INVALID_EXCEPTION),
+ TEST_c_c (ctan, minus_infty, minus_zero, qnan_value, minus_zero, INVALID_EXCEPTION),
TEST_c_c (ctan, minus_infty, -2, qnan_value, qnan_value, INVALID_EXCEPTION),
TEST_c_c (ctan, qnan_value, plus_infty, 0.0, 1.0, IGNORE_ZERO_INF_SIGN),
@@ -112,9 +112,9 @@ static const struct test_c_c_data ctan_test_data[] =
TEST_c_c (ctan, 0.5, qnan_value, qnan_value, qnan_value, INVALID_EXCEPTION_OK),
TEST_c_c (ctan, -4.5, qnan_value, qnan_value, qnan_value, INVALID_EXCEPTION_OK),
- TEST_c_c (ctan, qnan_value, 0, qnan_value, qnan_value, INVALID_EXCEPTION_OK),
+ TEST_c_c (ctan, qnan_value, 0, qnan_value, 0),
TEST_c_c (ctan, qnan_value, 5, qnan_value, qnan_value, INVALID_EXCEPTION_OK),
- TEST_c_c (ctan, qnan_value, minus_zero, qnan_value, qnan_value, INVALID_EXCEPTION_OK),
+ TEST_c_c (ctan, qnan_value, minus_zero, qnan_value, minus_zero),
TEST_c_c (ctan, qnan_value, -0.25, qnan_value, qnan_value, INVALID_EXCEPTION_OK),
TEST_c_c (ctan, qnan_value, qnan_value, qnan_value, qnan_value),
diff --git a/math/libm-test-ctanh.inc b/math/libm-test-ctanh.inc
index 6ddeb0d361..8a8148248a 100644
--- a/math/libm-test-ctanh.inc
+++ b/math/libm-test-ctanh.inc
@@ -89,13 +89,13 @@ static const struct test_c_c_data ctanh_test_data[] =
TEST_c_c (ctanh, minus_infty, -0x1.2p16383L, -1.0, 0.0),
#endif
- TEST_c_c (ctanh, 0, plus_infty, qnan_value, qnan_value, INVALID_EXCEPTION),
+ TEST_c_c (ctanh, 0, plus_infty, 0, qnan_value, INVALID_EXCEPTION),
TEST_c_c (ctanh, 2, plus_infty, qnan_value, qnan_value, INVALID_EXCEPTION),
- TEST_c_c (ctanh, 0, minus_infty, qnan_value, qnan_value, INVALID_EXCEPTION),
+ TEST_c_c (ctanh, 0, minus_infty, 0, qnan_value, INVALID_EXCEPTION),
TEST_c_c (ctanh, 2, minus_infty, qnan_value, qnan_value, INVALID_EXCEPTION),
- TEST_c_c (ctanh, minus_zero, plus_infty, qnan_value, qnan_value, INVALID_EXCEPTION),
+ TEST_c_c (ctanh, minus_zero, plus_infty, minus_zero, qnan_value, INVALID_EXCEPTION),
TEST_c_c (ctanh, -2, plus_infty, qnan_value, qnan_value, INVALID_EXCEPTION),
- TEST_c_c (ctanh, minus_zero, minus_infty, qnan_value, qnan_value, INVALID_EXCEPTION),
+ TEST_c_c (ctanh, minus_zero, minus_infty, minus_zero, qnan_value, INVALID_EXCEPTION),
TEST_c_c (ctanh, -2, minus_infty, qnan_value, qnan_value, INVALID_EXCEPTION),
TEST_c_c (ctanh, plus_infty, qnan_value, 1.0, 0.0, IGNORE_ZERO_INF_SIGN),
@@ -111,9 +111,9 @@ static const struct test_c_c_data ctanh_test_data[] =
TEST_c_c (ctanh, qnan_value, 0.5, qnan_value, qnan_value, INVALID_EXCEPTION_OK),
TEST_c_c (ctanh, qnan_value, -4.5, qnan_value, qnan_value, INVALID_EXCEPTION_OK),
- TEST_c_c (ctanh, 0, qnan_value, qnan_value, qnan_value, INVALID_EXCEPTION_OK),
+ TEST_c_c (ctanh, 0, qnan_value, 0, qnan_value),
TEST_c_c (ctanh, 5, qnan_value, qnan_value, qnan_value, INVALID_EXCEPTION_OK),
- TEST_c_c (ctanh, minus_zero, qnan_value, qnan_value, qnan_value, INVALID_EXCEPTION_OK),
+ TEST_c_c (ctanh, minus_zero, qnan_value, minus_zero, qnan_value),
TEST_c_c (ctanh, -0.25, qnan_value, qnan_value, qnan_value, INVALID_EXCEPTION_OK),
TEST_c_c (ctanh, qnan_value, qnan_value, qnan_value, qnan_value),
diff --git a/math/s_ctan_template.c b/math/s_ctan_template.c
index 723156eed4..644d7e696d 100644
--- a/math/s_ctan_template.c
+++ b/math/s_ctan_template.c
@@ -49,7 +49,10 @@ M_DECL_FUNC (__ctan) (CFLOAT x)
else
{
__real__ res = M_NAN;
- __imag__ res = M_NAN;
+ if (__imag__ x == 0)
+ __imag__ res = __imag__ x;
+ else
+ __imag__ res = M_NAN;
if (isinf (__real__ x))
feraiseexcept (FE_INVALID);
diff --git a/math/s_ctanh_template.c b/math/s_ctanh_template.c
index 96873dd0a3..f237e81511 100644
--- a/math/s_ctanh_template.c
+++ b/math/s_ctanh_template.c
@@ -48,7 +48,10 @@ M_DECL_FUNC (__ctanh) (CFLOAT x)
}
else
{
- __real__ res = M_NAN;
+ if (__real__ x == 0)
+ __real__ res = __real__ x;
+ else
+ __real__ res = M_NAN;
__imag__ res = M_NAN;
if (isinf (__imag__ x))