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| author | Stefan Liebler <stli@linux.vnet.ibm.com> | 2014-04-29 15:43:36 +0200 |
|---|---|---|
| committer | Andreas Krebbel <krebbel@linux.vnet.ibm.com> | 2014-04-29 15:43:36 +0200 |
| commit | 2ca180e97a16f3ee3ec9e7e5a5fb7eda3d863a02 (patch) | |
| tree | 4b1d6f28281ad75b3abe35ee09684e1aae943012 | |
| parent | dc041bd4dbaf0f22b962647e0d0a1b8090d0e679 (diff) | |
| download | glibc-2ca180e97a16f3ee3ec9e7e5a5fb7eda3d863a02.tar.gz glibc-2ca180e97a16f3ee3ec9e7e5a5fb7eda3d863a02.tar.xz glibc-2ca180e97a16f3ee3ec9e7e5a5fb7eda3d863a02.zip | |
[BZ #16823] Fix log1pl returning wrong infinity sign
| -rw-r--r-- | ChangeLog | 8 | ||||
| -rw-r--r-- | sysdeps/ieee754/dbl-64/s_log1p.c | 2 | ||||
| -rw-r--r-- | sysdeps/ieee754/flt-32/s_log1pf.c | 2 | ||||
| -rw-r--r-- | sysdeps/ieee754/ldbl-128/s_log1pl.c | 2 |
4 files changed, 11 insertions, 3 deletions
diff --git a/ChangeLog b/ChangeLog index 4007295165..803d11414a 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,11 @@ +2014-04-29 Stefan Liebler <stli@linux.vnet.ibm.com> + + [BZ #16823] + * sysdeps/ieee754/ldbl-128/s_log1pl.c (__log1pl): + Always divide by positive zero when computing -Inf result. + * sysdeps/ieee754/dbl-64/s_log1p.c (__log1p): Likewise. + * sysdeps/ieee754/flt-32/s_log1pf.c (__log1pf): Likewise. + 2014-04-28 Adhemerval Zanella <azanella@linux.vnet.ibm.com> * sysdeps/powerpc/fpu/fclrexcpt.c (__feclearexcept): Do not update diff --git a/sysdeps/ieee754/dbl-64/s_log1p.c b/sysdeps/ieee754/dbl-64/s_log1p.c index fd4dce5f23..c922148937 100644 --- a/sysdeps/ieee754/dbl-64/s_log1p.c +++ b/sysdeps/ieee754/dbl-64/s_log1p.c @@ -110,7 +110,7 @@ __log1p (double x) if (__glibc_unlikely (ax >= 0x3ff00000)) /* x <= -1.0 */ { if (x == -1.0) - return -two54 / (x - x); /* log1p(-1)=+inf */ + return -two54 / zero; /* log1p(-1)=-inf */ else return (x - x) / (x - x); /* log1p(x<-1)=NaN */ } diff --git a/sysdeps/ieee754/flt-32/s_log1pf.c b/sysdeps/ieee754/flt-32/s_log1pf.c index 0307277106..5f00febc04 100644 --- a/sysdeps/ieee754/flt-32/s_log1pf.c +++ b/sysdeps/ieee754/flt-32/s_log1pf.c @@ -42,7 +42,7 @@ __log1pf(float x) k = 1; if (hx < 0x3ed413d7) { /* x < 0.41422 */ if(ax>=0x3f800000) { /* x <= -1.0 */ - if(x==(float)-1.0) return -two25/(x-x); /* log1p(-1)=+inf */ + if(x==(float)-1.0) return -two25/zero; /* log1p(-1)=-inf */ else return (x-x)/(x-x); /* log1p(x<-1)=NaN */ } if(ax<0x31000000) { /* |x| < 2**-29 */ diff --git a/sysdeps/ieee754/ldbl-128/s_log1pl.c b/sysdeps/ieee754/ldbl-128/s_log1pl.c index d991e8a720..d8d89f0a8c 100644 --- a/sysdeps/ieee754/ldbl-128/s_log1pl.c +++ b/sysdeps/ieee754/ldbl-128/s_log1pl.c @@ -150,7 +150,7 @@ __log1pl (long double xm1) if (x <= 0.0L) { if (x == 0.0L) - return (-1.0L / (x - x)); + return (-1.0L / zero); /* log1p(-1) = -inf */ else return (zero / (x - x)); } |