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| author | Joseph Myers <joseph@codesourcery.com> | 2015-06-23 22:24:20 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2015-06-23 22:24:20 +0000 |
| commit | ad39cce0da0161dba69781c53349acf2e23f156c (patch) | |
| tree | 1c7b29a8fe9358aa720485ca439db53d6749b379 /sysdeps/ieee754/ldbl-128ibm/k_sincosl.c | |
| parent | 8b1bab5ffa235bc494c33fdbe4c9994202936cfc (diff) | |
| download | glibc-ad39cce0da0161dba69781c53349acf2e23f156c.zip glibc-ad39cce0da0161dba69781c53349acf2e23f156c.tar.gz glibc-ad39cce0da0161dba69781c53349acf2e23f156c.tar.bz2 | |
Fix sin, sincos missing underflows (bug 16526, bug 16538).
Similar to various other bugs in this area, some sin and sincos
implementations do not raise the underflow exception for subnormal
arguments, when the result is tiny and inexact. This patch forces the
exception in a similar way to previous fixes.
Tested for x86_64, x86, mips64 and powerpc.
[BZ #16526]
[BZ #16538]
* sysdeps/ieee754/dbl-64/s_sin.c: Include <float.h>.
(__sin): Force underflow exception for arguments with small
absolute value.
* sysdeps/ieee754/flt-32/k_sinf.c: Include <float.h>.
(__kernel_sinf): Force underflow exception for arguments with
small absolute value.
* sysdeps/ieee754/ldbl-128/k_sincosl.c: Include <float.h>.
(__kernel_sincosl): Force underflow exception for arguments with
small absolute value.
* sysdeps/ieee754/ldbl-128/k_sinl.c: Include <float.h>.
(__kernel_sinl): Force underflow exception for arguments with
small absolute value.
* sysdeps/ieee754/ldbl-128ibm/k_sincosl.c: Include <float.h>.
(__kernel_sincosl): Force underflow exception for arguments with
small absolute value.
* sysdeps/ieee754/ldbl-128ibm/k_sinl.c: Include <float.h>.
(__kernel_sinl): Force underflow exception for arguments with
small absolute value.
* sysdeps/ieee754/ldbl-96/k_sinl.c: Include <float.h>.
(__kernel_sinl): Force underflow exception for arguments with
small absolute value.
* sysdeps/powerpc/fpu/k_sinf.c: Include <float.h>.
(__kernel_sinf): Force underflow exception for arguments with
small absolute value.
* math/auto-libm-test-in: Add more tests of sin and sincos.
* math/auto-libm-test-out: Regenerated.
Diffstat (limited to 'sysdeps/ieee754/ldbl-128ibm/k_sincosl.c')
| -rw-r--r-- | sysdeps/ieee754/ldbl-128ibm/k_sincosl.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/sysdeps/ieee754/ldbl-128ibm/k_sincosl.c b/sysdeps/ieee754/ldbl-128ibm/k_sincosl.c index f831e3f..0a76e1c 100644 --- a/sysdeps/ieee754/ldbl-128ibm/k_sincosl.c +++ b/sysdeps/ieee754/ldbl-128ibm/k_sincosl.c @@ -17,6 +17,7 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ +#include <float.h> #include <math.h> #include <math_private.h> @@ -112,12 +113,19 @@ __kernel_sincosl(long double x, long double y, long double *sinx, long double *c /* Argument is small enough to approximate it by a Chebyshev polynomial of degree 16(17). */ if (tix < 0x3c600000) /* |x| < 2^-57 */ - if (!((int)x)) /* generate inexact */ - { - *sinx = x; - *cosx = ONE; - return; - } + { + if (fabsl (x) < LDBL_MIN) + { + long double force_underflow = x * x; + math_force_eval (force_underflow); + } + if (!((int)x)) /* generate inexact */ + { + *sinx = x; + *cosx = ONE; + return; + } + } z = x * x; *sinx = x + (x * (z*(SIN1+z*(SIN2+z*(SIN3+z*(SIN4+ z*(SIN5+z*(SIN6+z*(SIN7+z*SIN8))))))))); |