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| author | Joseph Myers <joseph@codesourcery.com> | 2015-05-14 23:38:07 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2015-05-14 23:38:07 +0000 |
| commit | 0b7a5f920163d03806d7c5d9d1c83b16942c9496 (patch) | |
| tree | a108347db6f5f094bf917214f562b9a3a7ae8b04 /ChangeLog | |
| parent | 95b07fbcc702a83b421cb5d0488ba2817d3123c1 (diff) | |
| download | glibc-0b7a5f920163d03806d7c5d9d1c83b16942c9496.zip glibc-0b7a5f920163d03806d7c5d9d1c83b16942c9496.tar.gz glibc-0b7a5f920163d03806d7c5d9d1c83b16942c9496.tar.bz2 | |
Fix log1p missing underflows (bug 16339).
Similar to various other bugs in this area, some log1p 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. (The ldbl-128ibm implementation
doesn't currently need any change as it already generates this
exception, albeit through code that would generate spurious exceptions
in other cases; special code for this issue will only be needed there
when fixing the spurious exceptions.)
Tested for x86_64, x86, powerpc and mips64.
[BZ #16339]
* sysdeps/i386/fpu/s_log1p.S (dbl_min): New object.
(__log1p): Force underflow exception for results with small
absolute value.
* sysdeps/i386/fpu/s_log1pf.S (flt_min): New object.
(__log1pf): Force underflow exception for results with small
absolute value.
* sysdeps/ieee754/dbl-64/s_log1p.c: Include <float.h>.
(__log1p): Force underflow exception for results with small
absolute value.
* sysdeps/ieee754/flt-32/s_log1pf.c: Include <float.h>.
(__log1pf): Force underflow exception for results with small
absolute value.
* sysdeps/ieee754/ldbl-128/s_log1pl.c: Include <float.h>.
(__log1pl): Force underflow exception for results with small
absolute value.
* math/auto-libm-test-in: Do not allow missing underflow
exceptions from log1p.
* math/auto-libm-test-out: Regenerated.
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 22 |
1 files changed, 22 insertions, 0 deletions
@@ -1,3 +1,25 @@ +2015-05-14 Joseph Myers <joseph@codesourcery.com> + + [BZ #16339] + * sysdeps/i386/fpu/s_log1p.S (dbl_min): New object. + (__log1p): Force underflow exception for results with small + absolute value. + * sysdeps/i386/fpu/s_log1pf.S (flt_min): New object. + (__log1pf): Force underflow exception for results with small + absolute value. + * sysdeps/ieee754/dbl-64/s_log1p.c: Include <float.h>. + (__log1p): Force underflow exception for results with small + absolute value. + * sysdeps/ieee754/flt-32/s_log1pf.c: Include <float.h>. + (__log1pf): Force underflow exception for results with small + absolute value. + * sysdeps/ieee754/ldbl-128/s_log1pl.c: Include <float.h>. + (__log1pl): Force underflow exception for results with small + absolute value. + * math/auto-libm-test-in: Do not allow missing underflow + exceptions from log1p. + * math/auto-libm-test-out: Regenerated. + 2015-05-14 Jakub Bogusz <qboosh@pld-linux.org> Adhemerval Zanella <adhemerval.zanella@linaro.org> |