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| author | Joseph Myers <joseph@codesourcery.com> | 2013-12-03 21:49:56 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2013-12-03 21:49:56 +0000 |
| commit | 749008ff0361297af02b8574ac8848d35436eac3 (patch) | |
| tree | 24d4078cb9fa9eb70e27a8c886301db8d09fadb1 /sysdeps/ieee754 | |
| parent | 17dea1887fcc116941e07cb0f5f2078140ab0384 (diff) | |
| download | glibc-749008ff0361297af02b8574ac8848d35436eac3.tar.gz glibc-749008ff0361297af02b8574ac8848d35436eac3.tar.xz glibc-749008ff0361297af02b8574ac8848d35436eac3.zip | |
Fix exp missing underflows (bug 15268, bug 15425).
Diffstat (limited to 'sysdeps/ieee754')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/e_exp.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/sysdeps/ieee754/dbl-64/e_exp.c b/sysdeps/ieee754/dbl-64/e_exp.c index df3aa5efaa..9d35e6d66c 100644 --- a/sysdeps/ieee754/dbl-64/e_exp.c +++ b/sysdeps/ieee754/dbl-64/e_exp.c @@ -39,6 +39,7 @@ #include "uexp.tbl" #include <math_private.h> #include <fenv.h> +#include <float.h> #ifndef SECTION # define SECTION @@ -169,7 +170,7 @@ __ieee754_exp (double x) else { retval = __slowexp (x); - goto ret; + goto check_uflow_ret; } /*if error is over bound */ } ex = -(1022 + ex); @@ -185,13 +186,23 @@ __ieee754_exp (double x) { binexp.i[HIGH_HALF] = 0x00100000; retval = (res - 1.0) * binexp.x; - goto ret; + goto check_uflow_ret; } else { retval = __slowexp (x); - goto ret; + goto check_uflow_ret; } /* if error is over bound */ + check_uflow_ret: + if (retval < DBL_MIN) + { +#if FLT_EVAL_METHOD != 0 + volatile +#endif + double force_underflow = tiny * tiny; + math_force_eval (force_underflow); + } + goto ret; } else { |