diff options
Diffstat (limited to 'sysdeps/ieee754')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/s_log1p.c | 10 | ||||
| -rw-r--r-- | sysdeps/ieee754/flt-32/s_log1pf.c | 8 | ||||
| -rw-r--r-- | sysdeps/ieee754/ldbl-128/s_log1pl.c | 6 |
3 files changed, 23 insertions, 1 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_log1p.c b/sysdeps/ieee754/dbl-64/s_log1p.c index 86bbfbacaf..cff555b0aa 100644 --- a/sysdeps/ieee754/dbl-64/s_log1p.c +++ b/sysdeps/ieee754/dbl-64/s_log1p.c @@ -78,6 +78,7 @@ * See HP-15C Advanced Functions Handbook, p.193. */ +#include <float.h> #include <math.h> #include <math_private.h> @@ -118,7 +119,14 @@ __log1p (double x) { math_force_eval (two54 + x); /* raise inexact */ if (ax < 0x3c900000) /* |x| < 2**-54 */ - return x; + { + if (fabs (x) < DBL_MIN) + { + double force_underflow = x * x; + math_force_eval (force_underflow); + } + return x; + } else return x - x * x * 0.5; } diff --git a/sysdeps/ieee754/flt-32/s_log1pf.c b/sysdeps/ieee754/flt-32/s_log1pf.c index 94c33fca16..83a09f1414 100644 --- a/sysdeps/ieee754/flt-32/s_log1pf.c +++ b/sysdeps/ieee754/flt-32/s_log1pf.c @@ -13,6 +13,7 @@ * ==================================================== */ +#include <float.h> #include <math.h> #include <math_private.h> @@ -48,7 +49,14 @@ __log1pf(float x) if(ax<0x31000000) { /* |x| < 2**-29 */ math_force_eval(two25+x); /* raise inexact */ if (ax<0x24800000) /* |x| < 2**-54 */ + { + if (fabsf (x) < FLT_MIN) + { + float force_underflow = x * x; + math_force_eval (force_underflow); + } return x; + } else return x - x*x*(float)0.5; } diff --git a/sysdeps/ieee754/ldbl-128/s_log1pl.c b/sysdeps/ieee754/ldbl-128/s_log1pl.c index b70a55b758..ff759bc000 100644 --- a/sysdeps/ieee754/ldbl-128/s_log1pl.c +++ b/sysdeps/ieee754/ldbl-128/s_log1pl.c @@ -53,6 +53,7 @@ <http://www.gnu.org/licenses/>. */ +#include <float.h> #include <math.h> #include <math_private.h> @@ -140,6 +141,11 @@ __log1pl (long double xm1) if ((hx & 0x7fffffff) < 0x3f8e0000) { + if (fabsl (xm1) < LDBL_MIN) + { + long double force_underflow = xm1 * xm1; + math_force_eval (force_underflow); + } if ((int) xm1 == 0) return xm1; } |