changeset:   75595:9d69a2418d80
user:        Victor Stinner <vstinner@wyplay.com>
date:        Tue Mar 13 19:12:23 2012 +0100
files:       Python/pytime.c
description:
Issue #14180: Fix an invalid rounding when compiler optimization are enabled

Use volatile keyword to disable localy unsafe float optimizations.


diff -r 760cf150bb99 -r 9d69a2418d80 Python/pytime.c
--- a/Python/pytime.c	Tue Mar 13 17:42:18 2012 +0100
+++ b/Python/pytime.c	Tue Mar 13 19:12:23 2012 +0100
@@ -102,7 +102,9 @@
 {
     assert(denominator <= LONG_MAX);
     if (PyFloat_Check(obj)) {
-        double d, intpart, floatpart, err;
+        double d, intpart, err;
+        /* volatile avoids unsafe optimization on float enabled by gcc -O3 */
+        volatile double floatpart;
 
         d = PyFloat_AsDouble(obj);
         floatpart = modf(d, &intpart);