Merged revisions 64349 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk
........
r64349 | mark.dickinson | 2008-06-17 16:16:55 -0500 (Tue, 17 Jun 2008) | 4 lines
Issue 3118: make test_math pass on Ubuntu/ia64. exp(-745.0) was raising
OverflowError incorrectly on this platform, presumably as a result of
the libm setting errno = ERANGE for this call.
........
diff --git a/Modules/mathmodule.c b/Modules/mathmodule.c
index fa607e3..4c820c5 100644
--- a/Modules/mathmodule.c
+++ b/Modules/mathmodule.c
@@ -82,12 +82,17 @@
* should return a zero on underflow, and +- HUGE_VAL on
* overflow, so testing the result for zero suffices to
* distinguish the cases).
+ *
+ * On some platforms (Ubuntu/ia64) it seems that errno can be
+ * set to ERANGE for subnormal results that do *not* underflow
+ * to zero. So to be safe, we'll ignore ERANGE whenever the
+ * function result is less than one in absolute value.
*/
- if (x)
+ if (fabs(x) < 1.0)
+ result = 0;
+ else
PyErr_SetString(PyExc_OverflowError,
"math range error");
- else
- result = 0;
}
else
/* Unexpected math error */