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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/flt-32 | |
| parent | 8b1bab5ffa235bc494c33fdbe4c9994202936cfc (diff) | |
| download | glibc-ad39cce0da0161dba69781c53349acf2e23f156c.tar.gz glibc-ad39cce0da0161dba69781c53349acf2e23f156c.tar.xz glibc-ad39cce0da0161dba69781c53349acf2e23f156c.zip | |
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/flt-32')
| -rw-r--r-- | sysdeps/ieee754/flt-32/k_sinf.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/sysdeps/ieee754/flt-32/k_sinf.c b/sysdeps/ieee754/flt-32/k_sinf.c index 0bafd83cf0..0c98a2ae91 100644 --- a/sysdeps/ieee754/flt-32/k_sinf.c +++ b/sysdeps/ieee754/flt-32/k_sinf.c @@ -17,6 +17,7 @@ static char rcsid[] = "$NetBSD: k_sinf.c,v 1.4 1995/05/10 20:46:33 jtc Exp $"; #endif +#include <float.h> #include <math.h> #include <math_private.h> @@ -36,7 +37,15 @@ float __kernel_sinf(float x, float y, int iy) GET_FLOAT_WORD(ix,x); ix &= 0x7fffffff; /* high word of x */ if(ix<0x32000000) /* |x| < 2**-27 */ - {if((int)x==0) return x;} /* generate inexact */ + { + if (fabsf (x) < FLT_MIN) + { + float force_underflow = x * x; + math_force_eval (force_underflow); + } + if ((int) x == 0) + return x; /* generate inexact */ + } z = x*x; v = z*x; r = S2+z*(S3+z*(S4+z*(S5+z*S6))); |