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| author | Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com> | 2017-02-17 09:07:57 -0200 |
|---|---|---|
| committer | Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com> | 2017-02-17 09:07:57 -0200 |
| commit | 51b34a9c47e4228873788ad66699c328e27a3295 (patch) | |
| tree | dae7359c968c1a37cf775e42b93e9d93500b456d /sysdeps/ieee754/dbl-64 | |
| parent | f0166c1643038e0ca42d300ddae36c00f400f4cf (diff) | |
| download | glibc-51b34a9c47e4228873788ad66699c328e27a3295.zip glibc-51b34a9c47e4228873788ad66699c328e27a3295.tar.gz glibc-51b34a9c47e4228873788ad66699c328e27a3295.tar.bz2 | |
Fix lgamma*, log10* and log2* results [BZ #21171]
lgamma(-x) should return +Inf and raise divide-by-zero.
log10(+-0) and log2(+-0) should return -Inf and raise divide-by-zero.
Tested on powerpc, powerpc64, powerpc64le and x86_64.
[BZ #21171]
* sysdeps/ieee754/dbl-64/e_lgamma_r.c (__ieee754_lgamma_r): Return
+Inf and raise divide-by-zero when x is negative.
* sysdeps/ieee754/flt-32/e_lgammaf_r.c (__ieee754_lgammaf_r): Likewise.
* sysdeps/ieee754/ldbl-128/e_lgammal_r.c (__ieee754_lgammal_r): Likewise.
* sysdeps/ieee754/dbl-64/e_log10.c (__ieee754_log10): Return
-Inf and raise divide-by-zero when x = +-0.
* sysdeps/ieee754/dbl-64/e_log2.c (__ieee754_log2): Likewise.
* sysdeps/ieee754/flt-32/e_log10f.c (__ieee754_log10f): Likewise.
* sysdeps/ieee754/flt-32/e_log2f.c (__ieee754_log2f): Likewise.
* sysdeps/ieee754/ldbl-128/e_log10l.c (__ieee754_log10l): Likewise.
* sysdeps/ieee754/ldbl-128/e_log2l.c (__ieee754_log2l): Likewise.
* sysdeps/ieee754/ldbl-128ibm/e_log10l.c (__ieee754_log10l): Likewise.
* sysdeps/ieee754/ldbl-128ibm/e_log2l.c (__ieee754_log2l): Likewise.
Diffstat (limited to 'sysdeps/ieee754/dbl-64')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/e_lgamma_r.c | 2 | ||||
| -rw-r--r-- | sysdeps/ieee754/dbl-64/e_log10.c | 2 | ||||
| -rw-r--r-- | sysdeps/ieee754/dbl-64/e_log2.c | 2 |
3 files changed, 3 insertions, 3 deletions
diff --git a/sysdeps/ieee754/dbl-64/e_lgamma_r.c b/sysdeps/ieee754/dbl-64/e_lgamma_r.c index 15154c0..c337679 100644 --- a/sysdeps/ieee754/dbl-64/e_lgamma_r.c +++ b/sysdeps/ieee754/dbl-64/e_lgamma_r.c @@ -225,7 +225,7 @@ __ieee754_lgamma_r(double x, int *signgamp) if(hx<0) { if(__builtin_expect(ix>=0x43300000, 0)) /* |x|>=2**52, must be -integer */ - return x/zero; + return __fabs (x)/zero; if (x < -2.0 && x > -28.0) return __lgamma_neg (x, signgamp); t = sin_pi(x); diff --git a/sysdeps/ieee754/dbl-64/e_log10.c b/sysdeps/ieee754/dbl-64/e_log10.c index df59d9d..bf40bca 100644 --- a/sysdeps/ieee754/dbl-64/e_log10.c +++ b/sysdeps/ieee754/dbl-64/e_log10.c @@ -65,7 +65,7 @@ __ieee754_log10 (double x) if (hx < 0x00100000) { /* x < 2**-1022 */ if (__glibc_unlikely (((hx & 0x7fffffff) | lx) == 0)) - return -two54 / (x - x); /* log(+-0)=-inf */ + return -two54 / __fabs (x); /* log(+-0)=-inf */ if (__glibc_unlikely (hx < 0)) return (x - x) / (x - x); /* log(-#) = NaN */ k -= 54; diff --git a/sysdeps/ieee754/dbl-64/e_log2.c b/sysdeps/ieee754/dbl-64/e_log2.c index bc6a341..5af68d8 100644 --- a/sysdeps/ieee754/dbl-64/e_log2.c +++ b/sysdeps/ieee754/dbl-64/e_log2.c @@ -83,7 +83,7 @@ __ieee754_log2 (double x) if (hx < 0x00100000) { /* x < 2**-1022 */ if (__glibc_unlikely (((hx & 0x7fffffff) | lx) == 0)) - return -two54 / (x - x); /* log(+-0)=-inf */ + return -two54 / __fabs (x); /* log(+-0)=-inf */ if (__glibc_unlikely (hx < 0)) return (x - x) / (x - x); /* log(-#) = NaN */ k -= 54; |