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| author | Joseph Myers <joseph@codesourcery.com> | 2014-03-28 20:53:32 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2014-03-28 20:53:32 +0000 |
| commit | 289e0779571a36a8f30ae0408b4902bb7f2ab92e (patch) | |
| tree | b958fb51b0657f12d0571e4d82c2069a2929570f /math | |
| parent | 277ae3f186eb9158219aacf20199cdd02ad133e7 (diff) | |
| download | glibc-289e0779571a36a8f30ae0408b4902bb7f2ab92e.tar.gz glibc-289e0779571a36a8f30ae0408b4902bb7f2ab92e.tar.xz glibc-289e0779571a36a8f30ae0408b4902bb7f2ab92e.zip | |
Fix clog10 (-0 +/- 0i) (bug 16362).
This patch fixes the imaginary part of clog10 (-0 +/- 0i), which should be +/-pi / log(10) by analogy with clog (the functions were wrongly returning a result with imaginary part +/-pi, same as for clog, and the tests matched the incorrect result, though both functions and tests were correct for the similar case of clog10 (-inf +/- 0i)). Tested x86_64 and x86. [BZ #16362] * math/s_clog10.c (M_PI_LOG10E): New macro. (__clog10): Use M_PI_LOG10E instead of M_PI when real and imaginary parts are 0. * math/s_clog10f.c (M_PI_LOG10Ef): New macro. (__clog10f): Use M_PI_LOG10Ef instead of M_PI when real and imaginary parts are 0. * math/s_clog10l.c (M_PI_LOG10El): New macro. (__clog10l): Use M_PI_LOG10El instead of M_PIl when real and imaginary parts are 0. * math/libm-test.inc (clog10_test_data): Update expected results for when real and imaginary parts are 0.
Diffstat (limited to 'math')
| -rw-r--r-- | math/libm-test.inc | 4 | ||||
| -rw-r--r-- | math/s_clog10.c | 5 | ||||
| -rw-r--r-- | math/s_clog10f.c | 5 | ||||
| -rw-r--r-- | math/s_clog10l.c | 5 |
4 files changed, 14 insertions, 5 deletions
diff --git a/math/libm-test.inc b/math/libm-test.inc index 9c4c2bfb75..cefcb9682a 100644 --- a/math/libm-test.inc +++ b/math/libm-test.inc @@ -6130,8 +6130,8 @@ clog_test (void) static const struct test_c_c_data clog10_test_data[] = { - TEST_c_c (clog10, minus_zero, 0, minus_infty, M_PIl, DIVIDE_BY_ZERO_EXCEPTION), - TEST_c_c (clog10, minus_zero, minus_zero, minus_infty, -M_PIl, DIVIDE_BY_ZERO_EXCEPTION), + TEST_c_c (clog10, minus_zero, 0, minus_infty, M_PI_LOG10El, DIVIDE_BY_ZERO_EXCEPTION), + TEST_c_c (clog10, minus_zero, minus_zero, minus_infty, -M_PI_LOG10El, DIVIDE_BY_ZERO_EXCEPTION), TEST_c_c (clog10, 0, 0, minus_infty, 0.0, DIVIDE_BY_ZERO_EXCEPTION), TEST_c_c (clog10, 0, minus_zero, minus_infty, minus_zero, DIVIDE_BY_ZERO_EXCEPTION), diff --git a/math/s_clog10.c b/math/s_clog10.c index 417d56186c..e75787949f 100644 --- a/math/s_clog10.c +++ b/math/s_clog10.c @@ -25,6 +25,9 @@ /* log_10 (2). */ #define M_LOG10_2 0.3010299956639811952137388947244930267682 +/* pi * log10 (e). */ +#define M_PI_LOG10E 1.364376353841841347485783625431355770210 + __complex__ double __clog10 (__complex__ double x) { @@ -35,7 +38,7 @@ __clog10 (__complex__ double x) if (__glibc_unlikely (rcls == FP_ZERO && icls == FP_ZERO)) { /* Real and imaginary part are 0.0. */ - __imag__ result = signbit (__real__ x) ? M_PI : 0.0; + __imag__ result = signbit (__real__ x) ? M_PI_LOG10E : 0.0; __imag__ result = __copysign (__imag__ result, __imag__ x); /* Yes, the following line raises an exception. */ __real__ result = -1.0 / fabs (__real__ x); diff --git a/math/s_clog10f.c b/math/s_clog10f.c index a9120e03f8..ca2cdf4f80 100644 --- a/math/s_clog10f.c +++ b/math/s_clog10f.c @@ -25,6 +25,9 @@ /* log_10 (2). */ #define M_LOG10_2f 0.3010299956639811952137388947244930267682f +/* pi * log10 (e). */ +#define M_PI_LOG10Ef 1.364376353841841347485783625431355770210f + __complex__ float __clog10f (__complex__ float x) { @@ -35,7 +38,7 @@ __clog10f (__complex__ float x) if (__glibc_unlikely (rcls == FP_ZERO && icls == FP_ZERO)) { /* Real and imaginary part are 0.0. */ - __imag__ result = signbit (__real__ x) ? M_PI : 0.0; + __imag__ result = signbit (__real__ x) ? M_PI_LOG10Ef : 0.0; __imag__ result = __copysignf (__imag__ result, __imag__ x); /* Yes, the following line raises an exception. */ __real__ result = -1.0 / fabsf (__real__ x); diff --git a/math/s_clog10l.c b/math/s_clog10l.c index ac33a8f140..cdb5d61014 100644 --- a/math/s_clog10l.c +++ b/math/s_clog10l.c @@ -32,6 +32,9 @@ /* log_10 (2). */ #define M_LOG10_2l 0.3010299956639811952137388947244930267682L +/* pi * log10 (e). */ +#define M_PI_LOG10El 1.364376353841841347485783625431355770210L + __complex__ long double __clog10l (__complex__ long double x) { @@ -42,7 +45,7 @@ __clog10l (__complex__ long double x) if (__glibc_unlikely (rcls == FP_ZERO && icls == FP_ZERO)) { /* Real and imaginary part are 0.0. */ - __imag__ result = signbit (__real__ x) ? M_PIl : 0.0; + __imag__ result = signbit (__real__ x) ? M_PI_LOG10El : 0.0; __imag__ result = __copysignl (__imag__ result, __imag__ x); /* Yes, the following line raises an exception. */ __real__ result = -1.0 / fabsl (__real__ x); |