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| author | Joseph Myers <joseph@codesourcery.com> | 2015-06-18 23:27:41 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2015-06-18 23:27:41 +0000 |
| commit | 8db3cdefefe39e9d42b05b1610a63190e9f7fba4 (patch) | |
| tree | b4ae0196406ac58ad51d28aacc95b074341c179c /sysdeps/ieee754/flt-32 | |
| parent | a7a3c24632904b5b1d7e47eaf6b955bba6246b8f (diff) | |
| download | glibc-8db3cdefefe39e9d42b05b1610a63190e9f7fba4.zip glibc-8db3cdefefe39e9d42b05b1610a63190e9f7fba4.tar.gz glibc-8db3cdefefe39e9d42b05b1610a63190e9f7fba4.tar.bz2 | |
Fix asinh missing underflows (bug 16350).
Similar to various other bugs in this area, some asinh 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 and mips64.
[BZ #16350]
* sysdeps/i386/fpu/s_asinh.S (__asinh): Force underflow exception
for arguments with small absolute value.
* sysdeps/i386/fpu/s_asinhf.S (__asinhf): Likewise.
* sysdeps/i386/fpu/s_asinhl.S (__asinhl): Likewise.
* sysdeps/ieee754/dbl-64/s_asinh.c: Include <float.h>.
(__asinh): Force underflow exception for arguments with small
absolute value.
* sysdeps/ieee754/flt-32/s_asinhf.c: Include <float.h>.
(__asinhf): Force underflow exception for arguments with small
absolute value.
* sysdeps/ieee754/ldbl-128/s_asinhl.c: Include <float.h>.
(__asinhl): Force underflow exception for arguments with small
absolute value.
* sysdeps/ieee754/ldbl-128ibm/s_asinhl.c: Include <float.h>.
(__asinhl): Force underflow exception for arguments with small
absolute value.
* sysdeps/ieee754/ldbl-96/s_asinhl.c: Include <float.h>.
(__asinhl): Force underflow exception for arguments with small
absolute value.
* math/auto-libm-test-in: Do not mark underflow exceptions as
possibly missing for bug 16350.
* math/auto-libm-test-out: Regenerated.
Diffstat (limited to 'sysdeps/ieee754/flt-32')
| -rw-r--r-- | sysdeps/ieee754/flt-32/s_asinhf.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/sysdeps/ieee754/flt-32/s_asinhf.c b/sysdeps/ieee754/flt-32/s_asinhf.c index b7fa2b4..697faa8 100644 --- a/sysdeps/ieee754/flt-32/s_asinhf.c +++ b/sysdeps/ieee754/flt-32/s_asinhf.c @@ -13,6 +13,7 @@ * ==================================================== */ +#include <float.h> #include <math.h> #include <math_private.h> @@ -29,6 +30,11 @@ __asinhf(float x) GET_FLOAT_WORD(hx,x); ix = hx&0x7fffffff; if(__builtin_expect(ix< 0x38000000, 0)) { /* |x|<2**-14 */ + if (fabsf (x) < FLT_MIN) + { + float force_underflow = x * x; + math_force_eval (force_underflow); + } if(huge+x>one) return x; /* return x inexact except 0 */ } if(__builtin_expect(ix>0x47000000, 0)) { /* |x| > 2**14 */ |